X-Git-Url: http://sigrok.org/gitweb/?p=libserialport.git;a=blobdiff_plain;f=libserialport.h.in;h=8962ef8d942eb5fb6f368408b62feea9998a2a97;hp=e410dad69db4bc8407ae8eabdf7afc6072fdb5e0;hb=962143bc5c3a9a6e130cc1273ab465238c178d70;hpb=d514a26f8167a3c3006f8b8c9ff3a4a836bcdd24 diff --git a/libserialport.h.in b/libserialport.h.in index e410dad..8962ef8 100644 --- a/libserialport.h.in +++ b/libserialport.h.in @@ -1,7 +1,9 @@ /* * This file is part of the libserialport project. * - * Copyright (C) 2013 Martin Ling + * Copyright (C) 2013, 2015 Martin Ling + * Copyright (C) 2014 Uwe Hermann + * Copyright (C) 2014 Aurelien Jacobs * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as @@ -17,138 +19,1695 @@ * along with this program. If not, see . */ -#ifndef LIBSERIALPORT_H -#define LIBSERIALPORT_H +/** + * @mainpage libserialport API + * + * Introduction + * ============ + * + * libserialport is a minimal library written in C that is intended to take + * care of the OS-specific details when writing software that uses serial ports. + * + * By writing your serial code to use libserialport, you enable it to work + * transparently on any platform supported by the library. + * + * libserialport is an open source project released under the LGPL3+ license. + * + * The library is maintained by the [sigrok](http://sigrok.org/) project. See + * the [libserialport homepage](http://sigrok.org/wiki/Libserialport) for the + * latest information. + * + * Source code is maintained in git at + * [git://sigrok.org/libserialport](http://sigrok.org/gitweb/?p=libserialport.git). + * + * Bugs are tracked at http://sigrok.org/bugzilla/. + * + * The library was conceived and designed by Martin Ling, is maintained by + * Uwe Hermann, and has received contributions from several other developers. + * See the git history for full credits. + * + * API information + * =============== + * + * The API has been designed from scratch. It does not exactly resemble the + * serial API of any particular operating system. Instead it aims to provide + * a set of functions that can reliably be implemented across all operating + * systems. These form a sufficient basis for higher level behaviour to + * be implemented in a platform independent manner. + * + * If you are porting code written for a particular OS, you may find you need + * to restructure things somewhat, or do without some specialised features. + * For particular notes on porting existing code, see @ref Porting. + * + * The following subsections will help explain the principles of the API. + * + * Headers + * ------- + * + * To use libserialport functions in your code, you should include the + * libserialport.h header, i.e. "#include ". + * + * Namespace + * --------- + * + * All identifiers defined by the public libserialport headers use the prefix + * sp_ (for functions and data types) or SP_ (for macros and constants). + * + * Functions + * --------- + * + * The functions provided by the library are documented in detail in + * the following sections: + * + * - @ref Enumeration (obtaining a list of serial ports on the system) + * - @ref Ports (opening, closing and getting information about ports) + * - @ref Configuration (baud rate, parity, etc.) + * - @ref Signals (modem control lines, breaks, etc.) + * - @ref Data (reading and writing data, and buffer management) + * - @ref Waiting (waiting for ports to be ready, integrating with event loops) + * - @ref Errors (getting error and debugging information) + * + * Data structures + * --------------- + * + * The library defines three data structures: + * + * - @ref sp_port, which represents a serial port. + * See @ref Enumeration. + * - @ref sp_port_config, which represents a port configuration. + * See @ref Configuration. + * - @ref sp_event_set, which represents a set of events. + * See @ref Waiting. + * + * All these structures are allocated and freed by library functions. It is + * the caller's responsibility to ensure that the correct calls are made to + * free allocated structures after use. + * + * Return codes and error handling + * ------------------------------- + * + * Most functions have return type @ref sp_return and can return only four + * possible error values: + * + * - @ref SP_ERR_ARG means that a function was called with invalid + * arguments. This implies a bug in the caller. The arguments passed would + * be invalid regardless of the underlying OS or serial device involved. + * + * - @ref SP_ERR_FAIL means that the OS reported a failure. The error code or + * message provided by the OS can be obtained by calling sp_last_error_code() + * or sp_last_error_message(). + * + * - @ref SP_ERR_SUPP indicates that there is no support for the requested + * operation in the current OS, driver or device. No error message is + * available from the OS in this case. There is either no way to request + * the operation in the first place, or libserialport does not know how to + * do so in the current version. + * + * - @ref SP_ERR_MEM indicates that a memory allocation failed. + * + * All of these error values are negative. + * + * Calls that succeed return @ref SP_OK, which is equal to zero. Some functions + * declared @ref sp_return can also return a positive value for a successful + * numeric result, e.g. sp_blocking_read() or sp_blocking_write(). + * + * An error message is only available via sp_last_error_message() in the case + * where SP_ERR_FAIL was returned by the previous function call. The error + * message returned is that provided by the OS, using the current language + * settings. It is an error to call sp_last_error_code() or + * sp_last_error_message() except after a previous function call returned + * SP_ERR_FAIL. The library does not define its own error codes or messages + * to accompany other return codes. + * + * Thread safety + * ------------- + * + * Certain combinations of calls can be made concurrently, as follows. + * + * - Calls using different ports may always be made concurrently, i.e. + * it is safe for separate threads to handle their own ports. + * + * - Calls using the same port may be made concurrently when one call + * is a read operation and one call is a write operation, i.e. it is safe + * to use separate "reader" and "writer" threads for the same port. See + * below for which operations meet these definitions. + * + * Read operations: + * + * - sp_blocking_read() + * - sp_blocking_read_next() + * - sp_nonblocking_read() + * - sp_input_waiting() + * - sp_flush() with @ref SP_BUF_INPUT only. + * - sp_wait() with @ref SP_EVENT_RX_READY only. + * + * Write operations: + * + * - sp_blocking_write() + * - sp_nonblocking_write() + * - sp_output_waiting() + * - sp_drain() + * - sp_flush() with @ref SP_BUF_OUTPUT only. + * - sp_wait() with @ref SP_EVENT_TX_READY only. + * + * If two calls, on the same port, do not fit into one of these categories + * each, then they may not be made concurrently. + * + * Debugging + * --------- + * + * The library can output extensive tracing and debugging information. The + * simplest way to use this is to set the environment variable + * LIBSERIALPORT_DEBUG to any value; messages will then be output to the + * standard error stream. + * + * This behaviour is implemented by a default debug message handling + * callback. An alternative callback can be set using sp_set_debug_handler(), + * in order to e.g. redirect the output elsewhere or filter it. + * + * No guarantees are made about the content of the debug output; it is chosen + * to suit the needs of the developers and may change between releases. + * + * @anchor Porting + * Porting + * ------- + * + * The following guidelines may help when porting existing OS-specific code + * to use libserialport. + * + * ### Porting from Unix-like systems ### + * + * There are two main differences to note when porting code written for Unix. + * + * The first is that Unix traditionally provides a wide range of functionality + * for dealing with serial devices at the OS level; this is exposed through the + * termios API and dates to the days when serial terminals were common. If your + * code relies on many of these facilities you will need to adapt it, because + * libserialport provides only a raw binary channel with no special handling. + * + * The second relates to blocking versus non-blocking I/O behaviour. In + * Unix-like systems this is normally specified by setting the O_NONBLOCK + * flag on the file descriptor, affecting the semantics of subsequent read() + * and write() calls. + * + * In libserialport, blocking and nonblocking operations are both available at + * any time. If your existing code ѕets O_NONBLOCK, you should use + * sp_nonblocking_read() and sp_nonblocking_write() to get the same behaviour + * as your existing read() and write() calls. If it does not, you should use + * sp_blocking_read() and sp_blocking_write() instead. You may also find + * sp_blocking_read_next() useful, which reproduces the semantics of a blocking + * read() with VTIME = 0 and VMIN = 1 set in termios. + * + * Finally, you should take care if your program uses custom signal handlers. + * The blocking calls provided by libserialport will restart system calls that + * return with EINTR, so you will need to make your own arrangements if you + * need to interrupt blocking operations when your signal handlers are called. + * This is not an issue if you only use the default handlers. + * + * ### Porting from Windows ### + * + * The main consideration when porting from Windows is that there is no + * direct equivalent for overlapped I/O operations. + * + * If your program does not use overlapped I/O, you can simply use + * sp_blocking_read() and sp_blocking_write() as direct equivalents for + * ReadFile() and WriteFile(). You may also find sp_blocking_read_next() + * useful, which reproduces the special semantics of ReadFile() with + * ReadIntervalTimeout and ReadTotalTimeoutMultiplier set to MAXDWORD + * and 0 < ReadTotalTimeoutConstant < MAXDWORD. + * + * If your program makes use of overlapped I/O to continue work while a serial + * operation is in progress, then you can achieve the same results using + * sp_nonblocking_read() and sp_nonblocking_write(). + * + * Generally, overlapped I/O is combined with either waiting for completion + * once there is no more background work to do (using WaitForSingleObject() or + * WaitForMultipleObjects()), or periodically checking for completion with + * GetOverlappedResult(). If the aim is to start a new operation for further + * data once the previous one has completed, you can instead simply call the + * nonblocking functions again with the next data. If you need to wait for + * completion, use sp_wait() to determine when the port is ready to send or + * receive further data. + */ + +#ifndef LIBSERIALPORT_LIBSERIALPORT_H +#define LIBSERIALPORT_LIBSERIALPORT_H #ifdef __cplusplus extern "C" { #endif #include -#ifdef _WIN32 -#include -#endif - -/* Package version macros (e.g. for conditional compilation). */ -#define SP_PACKAGE_VERSION_MAJOR @SP_PACKAGE_VERSION_MAJOR@ -#define SP_PACKAGE_VERSION_MINOR @SP_PACKAGE_VERSION_MINOR@ -#define SP_PACKAGE_VERSION_STRING "@SP_PACKAGE_VERSION@" - -/* Library/libtool version macros (e.g. for conditional compilation). */ -#define SP_LIB_VERSION_CURRENT @SP_LIB_VERSION_CURRENT@ -#define SP_LIB_VERSION_REVISION @SP_LIB_VERSION_REVISION@ -#define SP_LIB_VERSION_AGE @SP_LIB_VERSION_AGE@ -#define SP_LIB_VERSION_STRING "@SP_LIB_VERSION@" - -/* A serial port. */ -struct sp_port { - /* Name used to open the port */ - char *name; - /* OS-specific port handle */ -#ifdef _WIN32 - HANDLE hdl; -#else - int fd; -#endif -}; -/* Configuration for a serial port. */ -struct sp_port_config { - int baudrate; - int bits; - int parity; - int stopbits; - int flowcontrol; - int rts; - int cts; - int dtr; - int dsr; - int xon_xoff; -}; - -/* Return values. */ -enum { - /* Operation completed successfully. */ +/** Return values. */ +enum sp_return { + /** Operation completed successfully. */ SP_OK = 0, - /* Invalid arguments were passed to the function. */ + /** Invalid arguments were passed to the function. */ SP_ERR_ARG = -1, - /* A system error occured while executing the operation. */ + /** A system error occurred while executing the operation. */ SP_ERR_FAIL = -2, - /* A memory allocation failed while executing the operation. */ + /** A memory allocation failed while executing the operation. */ SP_ERR_MEM = -3, + /** The requested operation is not supported by this system or device. */ + SP_ERR_SUPP = -4 +}; + +/** Port access modes. */ +enum sp_mode { + /** Open port for read access. */ + SP_MODE_READ = 1, + /** Open port for write access. */ + SP_MODE_WRITE = 2, + /** Open port for read and write access. @since 0.1.1 */ + SP_MODE_READ_WRITE = 3 }; -/* Port access modes. */ -enum { - /* Open port for read/write access. */ - SP_MODE_RDWR = 1, - /* Open port for read access only. */ - SP_MODE_RDONLY = 2, - /* Open port in non-blocking mode. */ - SP_MODE_NONBLOCK = 4, +/** Port events. */ +enum sp_event { + /** Data received and ready to read. */ + SP_EVENT_RX_READY = 1, + /** Ready to transmit new data. */ + SP_EVENT_TX_READY = 2, + /** Error occurred. */ + SP_EVENT_ERROR = 4 }; -/* Parity settings. */ -enum { - /* No parity. */ +/** Buffer selection. */ +enum sp_buffer { + /** Input buffer. */ + SP_BUF_INPUT = 1, + /** Output buffer. */ + SP_BUF_OUTPUT = 2, + /** Both buffers. */ + SP_BUF_BOTH = 3 +}; + +/** Parity settings. */ +enum sp_parity { + /** Special value to indicate setting should be left alone. */ + SP_PARITY_INVALID = -1, + /** No parity. */ SP_PARITY_NONE = 0, - /* Even parity. */ - SP_PARITY_EVEN = 1, - /* Odd parity. */ - SP_PARITY_ODD = 2, + /** Odd parity. */ + SP_PARITY_ODD = 1, + /** Even parity. */ + SP_PARITY_EVEN = 2, + /** Mark parity. */ + SP_PARITY_MARK = 3, + /** Space parity. */ + SP_PARITY_SPACE = 4 }; -/* RTS pin behaviour. */ -enum { +/** RTS pin behaviour. */ +enum sp_rts { + /** Special value to indicate setting should be left alone. */ + SP_RTS_INVALID = -1, + /** RTS off. */ SP_RTS_OFF = 0, + /** RTS on. */ SP_RTS_ON = 1, + /** RTS used for flow control. */ SP_RTS_FLOW_CONTROL = 2 }; -/* CTS pin behaviour. */ -enum { +/** CTS pin behaviour. */ +enum sp_cts { + /** Special value to indicate setting should be left alone. */ + SP_CTS_INVALID = -1, + /** CTS ignored. */ SP_CTS_IGNORE = 0, + /** CTS used for flow control. */ SP_CTS_FLOW_CONTROL = 1 }; -/* DTR pin behaviour. */ -enum { +/** DTR pin behaviour. */ +enum sp_dtr { + /** Special value to indicate setting should be left alone. */ + SP_DTR_INVALID = -1, + /** DTR off. */ SP_DTR_OFF = 0, + /** DTR on. */ SP_DTR_ON = 1, + /** DTR used for flow control. */ SP_DTR_FLOW_CONTROL = 2 }; -/* DSR pin behaviour. */ -enum { +/** DSR pin behaviour. */ +enum sp_dsr { + /** Special value to indicate setting should be left alone. */ + SP_DSR_INVALID = -1, + /** DSR ignored. */ SP_DSR_IGNORE = 0, + /** DSR used for flow control. */ SP_DSR_FLOW_CONTROL = 1 }; -/* XON/XOFF flow control behaviour. */ -enum { +/** XON/XOFF flow control behaviour. */ +enum sp_xonxoff { + /** Special value to indicate setting should be left alone. */ + SP_XONXOFF_INVALID = -1, + /** XON/XOFF disabled. */ SP_XONXOFF_DISABLED = 0, + /** XON/XOFF enabled for input only. */ SP_XONXOFF_IN = 1, + /** XON/XOFF enabled for output only. */ SP_XONXOFF_OUT = 2, + /** XON/XOFF enabled for input and output. */ SP_XONXOFF_INOUT = 3 }; -int sp_get_port_by_name(const char *portname, struct sp_port **port_ptr); +/** Standard flow control combinations. */ +enum sp_flowcontrol { + /** No flow control. */ + SP_FLOWCONTROL_NONE = 0, + /** Software flow control using XON/XOFF characters. */ + SP_FLOWCONTROL_XONXOFF = 1, + /** Hardware flow control using RTS/CTS signals. */ + SP_FLOWCONTROL_RTSCTS = 2, + /** Hardware flow control using DTR/DSR signals. */ + SP_FLOWCONTROL_DTRDSR = 3 +}; + +/** Input signals. */ +enum sp_signal { + /** Clear to send. */ + SP_SIG_CTS = 1, + /** Data set ready. */ + SP_SIG_DSR = 2, + /** Data carrier detect. */ + SP_SIG_DCD = 4, + /** Ring indicator. */ + SP_SIG_RI = 8 +}; + +/** + * Transport types. + * + * @since 0.1.1 + */ +enum sp_transport { + /** Native platform serial port. @since 0.1.1 */ + SP_TRANSPORT_NATIVE, + /** USB serial port adapter. @since 0.1.1 */ + SP_TRANSPORT_USB, + /** Bluetooth serial port adapter. @since 0.1.1 */ + SP_TRANSPORT_BLUETOOTH +}; + +/** + * @struct sp_port + * An opaque structure representing a serial port. + */ +struct sp_port; + +/** + * @struct sp_port_config + * An opaque structure representing the configuration for a serial port. + */ +struct sp_port_config; + +/** + * @struct sp_event_set + * A set of handles to wait on for events. + */ +struct sp_event_set { + /** Array of OS-specific handles. */ + void *handles; + /** Array of bitmasks indicating which events apply for each handle. */ + enum sp_event *masks; + /** Number of handles. */ + unsigned int count; +}; + +/** + * @defgroup Enumeration Port enumeration + * + * Enumerating the serial ports of a system. + * + * @{ + */ + +/** + * Obtain a pointer to a new sp_port structure representing the named port. + * + * The user should allocate a variable of type "struct sp_port *" and pass a + * pointer to this to receive the result. + * + * The result should be freed after use by calling sp_free_port(). + * + * @param[in] portname The OS-specific name of a serial port. Must not be NULL. + * @param[out] port_ptr If any error is returned, the variable pointed to by + * port_ptr will be set to NULL. Otherwise, it will be set + * to point to the newly allocated port. Must not be NULL. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_get_port_by_name(const char *portname, struct sp_port **port_ptr); + +/** + * Free a port structure obtained from sp_get_port_by_name() or sp_copy_port(). + * + * @param[in] port Pointer to a port structure. Must not be NULL. + * + * @since 0.1.0 + */ void sp_free_port(struct sp_port *port); -int sp_list_ports(struct sp_port ***list_ptr); -int sp_copy_port(const struct sp_port *port, struct sp_port **copy_ptr); + +/** + * List the serial ports available on the system. + * + * The result obtained is an array of pointers to sp_port structures, + * terminated by a NULL. The user should allocate a variable of type + * "struct sp_port **" and pass a pointer to this to receive the result. + * + * The result should be freed after use by calling sp_free_port_list(). + * If a port from the list is to be used after freeing the list, it must be + * copied first using sp_copy_port(). + * + * @param[out] list_ptr If any error is returned, the variable pointed to by + * list_ptr will be set to NULL. Otherwise, it will be set + * to point to the newly allocated array. Must not be NULL. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_list_ports(struct sp_port ***list_ptr); + +/** + * Make a new copy of an sp_port structure. + * + * The user should allocate a variable of type "struct sp_port *" and pass a + * pointer to this to receive the result. + * + * The copy should be freed after use by calling sp_free_port(). + * + * @param[in] port Pointer to a port structure. Must not be NULL. + * @param[out] copy_ptr If any error is returned, the variable pointed to by + * copy_ptr will be set to NULL. Otherwise, it will be set + * to point to the newly allocated copy. Must not be NULL. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_copy_port(const struct sp_port *port, struct sp_port **copy_ptr); + +/** + * Free a port list obtained from sp_list_ports(). + * + * This will also free all the sp_port structures referred to from the list; + * any that are to be retained must be copied first using sp_copy_port(). + * + * @param[in] ports Pointer to a list of port structures. Must not be NULL. + * + * @since 0.1.0 + */ void sp_free_port_list(struct sp_port **ports); -int sp_open(struct sp_port *port, int flags); -int sp_close(struct sp_port *port); -int sp_flush(struct sp_port *port); -int sp_write(struct sp_port *port, const void *buf, size_t count); -int sp_read(struct sp_port *port, void *buf, size_t count); -int sp_set_config(struct sp_port *port, struct sp_port_config *config); -int sp_last_error_code(void); -char *sp_last_error_message(void); -void sp_free_error_message(char *message); -#ifdef __cplusplus -} -#endif +/** + * @} + * @defgroup Ports Port handling + * + * Opening, closing and querying ports. + * + * @{ + */ + +/** + * Open the specified serial port. + * + * @param[in] port Pointer to a port structure. Must not be NULL. + * @param[in] flags Flags to use when opening the serial port. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_open(struct sp_port *port, enum sp_mode flags); + +/** + * Close the specified serial port. + * + * @param[in] port Pointer to a port structure. Must not be NULL. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_close(struct sp_port *port); + +/** + * Get the name of a port. + * + * The name returned is whatever is normally used to refer to a port on the + * current operating system; e.g. for Windows it will usually be a "COMn" + * device name, and for Unix it will be a device path beginning with "/dev/". + * + * @param[in] port Pointer to a port structure. Must not be NULL. + * + * @return The port name, or NULL if an invalid port is passed. The name + * string is part of the port structure and may not be used after + * the port structure has been freed. + * + * @since 0.1.0 + */ +char *sp_get_port_name(const struct sp_port *port); + +/** + * Get a description for a port, to present to end user. + * + * @param[in] port Pointer to a port structure. Must not be NULL. + * + * @return The port description, or NULL if an invalid port is passed. + * The description string is part of the port structure and may not + * be used after the port structure has been freed. + * + * @since 0.1.1 + */ +char *sp_get_port_description(const struct sp_port *port); + +/** + * Get the transport type used by a port. + * + * @param[in] port Pointer to a port structure. Must not be NULL. + * + * @return The port transport type. + * + * @since 0.1.1 + */ +enum sp_transport sp_get_port_transport(const struct sp_port *port); + +/** + * Get the USB bus number and address on bus of a USB serial adapter port. + * + * @param[in] port Pointer to a port structure. Must not be NULL. + * @param[out] usb_bus Pointer to a variable to store the USB bus. + * Can be NULL (in that case it will be ignored). + * @param[out] usb_address Pointer to a variable to store the USB address. + * Can be NULL (in that case it will be ignored). + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.1 + */ +enum sp_return sp_get_port_usb_bus_address(const struct sp_port *port, + int *usb_bus, int *usb_address); + +/** + * Get the USB Vendor ID and Product ID of a USB serial adapter port. + * + * @param[in] port Pointer to a port structure. Must not be NULL. + * @param[out] usb_vid Pointer to a variable to store the USB VID. + * Can be NULL (in that case it will be ignored). + * @param[out] usb_pid Pointer to a variable to store the USB PID. + * Can be NULL (in that case it will be ignored). + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.1 + */ +enum sp_return sp_get_port_usb_vid_pid(const struct sp_port *port, int *usb_vid, int *usb_pid); + +/** + * Get the USB manufacturer string of a USB serial adapter port. + * + * @param[in] port Pointer to a port structure. Must not be NULL. + * + * @return The port manufacturer string, or NULL if an invalid port is passed. + * The manufacturer string is part of the port structure and may not + * be used after the port structure has been freed. + * + * @since 0.1.1 + */ +char *sp_get_port_usb_manufacturer(const struct sp_port *port); + +/** + * Get the USB product string of a USB serial adapter port. + * + * @param[in] port Pointer to a port structure. Must not be NULL. + * + * @return The port product string, or NULL if an invalid port is passed. + * The product string is part of the port structure and may not be + * used after the port structure has been freed. + * + * @since 0.1.1 + */ +char *sp_get_port_usb_product(const struct sp_port *port); + +/** + * Get the USB serial number string of a USB serial adapter port. + * + * @param[in] port Pointer to a port structure. Must not be NULL. + * + * @return The port serial number, or NULL if an invalid port is passed. + * The serial number string is part of the port structure and may + * not be used after the port structure has been freed. + * + * @since 0.1.1 + */ +char *sp_get_port_usb_serial(const struct sp_port *port); + +/** + * Get the MAC address of a Bluetooth serial adapter port. + * + * @param[in] port Pointer to a port structure. Must not be NULL. + * + * @return The port MAC address, or NULL if an invalid port is passed. + * The MAC address string is part of the port structure and may not + * be used after the port structure has been freed. + * + * @since 0.1.1 + */ +char *sp_get_port_bluetooth_address(const struct sp_port *port); + +/** + * Get the operating system handle for a port. + * + * The type of the handle depends on the operating system. On Unix based + * systems, the handle is a file descriptor of type "int". On Windows, the + * handle is of type "HANDLE". The user should allocate a variable of the + * appropriate type and pass a pointer to this to receive the result. + * + * To obtain a valid handle, the port must first be opened by calling + * sp_open() using the same port structure. + * + * After the port is closed or the port structure freed, the handle may + * no longer be valid. + * + * @warning This feature is provided so that programs may make use of + * OS-specific functionality where desired. Doing so obviously + * comes at a cost in portability. It also cannot be guaranteed + * that direct usage of the OS handle will not conflict with the + * library's own usage of the port. Be careful. + * + * @param[in] port Pointer to a port structure. Must not be NULL. + * @param[out] result_ptr If any error is returned, the variable pointed to by + * result_ptr will have unknown contents and should not + * be used. Otherwise, it will be set to point to the + * OS handle. Must not be NULL. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_get_port_handle(const struct sp_port *port, void *result_ptr); -#endif /* LIBSERIALPORT_H */ +/** + * @} + * + * @defgroup Configuration Configuration + * + * Setting and querying serial port parameters. + * @{ + */ + +/** + * Allocate a port configuration structure. + * + * The user should allocate a variable of type "struct sp_port_config *" and + * pass a pointer to this to receive the result. The variable will be updated + * to point to the new configuration structure. The structure is opaque and + * must be accessed via the functions provided. + * + * All parameters in the structure will be initialised to special values which + * are ignored by sp_set_config(). + * + * The structure should be freed after use by calling sp_free_config(). + * + * @param[out] config_ptr If any error is returned, the variable pointed to by + * config_ptr will be set to NULL. Otherwise, it will + * be set to point to the allocated config structure. + * Must not be NULL. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_new_config(struct sp_port_config **config_ptr); + +/** + * Free a port configuration structure. + * + * @param[in] config Pointer to a configuration structure. Must not be NULL. + * + * @since 0.1.0 + */ +void sp_free_config(struct sp_port_config *config); + +/** + * Get the current configuration of the specified serial port. + * + * The user should allocate a configuration structure using sp_new_config() + * and pass this as the config parameter. The configuration structure will + * be updated with the port configuration. + * + * Any parameters that are configured with settings not recognised or + * supported by libserialport, will be set to special values that are + * ignored by sp_set_config(). + * + * @param[in] port Pointer to a port structure. Must not be NULL. + * @param[out] config Pointer to a configuration structure that will hold + * the result. Upon errors the contents of the config + * struct will not be changed. Must not be NULL. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_get_config(struct sp_port *port, struct sp_port_config *config); + +/** + * Set the configuration for the specified serial port. + * + * For each parameter in the configuration, there is a special value (usually + * -1, but see the documentation for each field). These values will be ignored + * and the corresponding setting left unchanged on the port. + * + * Upon errors, the configuration of the serial port is unknown since + * partial/incomplete config updates may have happened. + * + * @param[in] port Pointer to a port structure. Must not be NULL. + * @param[in] config Pointer to a configuration structure. Must not be NULL. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_set_config(struct sp_port *port, const struct sp_port_config *config); + +/** + * Set the baud rate for the specified serial port. + * + * @param[in] port Pointer to a port structure. Must not be NULL. + * @param[in] baudrate Baud rate in bits per second. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_set_baudrate(struct sp_port *port, int baudrate); + +/** + * Get the baud rate from a port configuration. + * + * The user should allocate a variable of type int and + * pass a pointer to this to receive the result. + * + * @param[in] config Pointer to a configuration structure. Must not be NULL. + * @param[out] baudrate_ptr Pointer to a variable to store the result. Must not be NULL. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_get_config_baudrate(const struct sp_port_config *config, int *baudrate_ptr); + +/** + * Set the baud rate in a port configuration. + * + * @param[in] config Pointer to a configuration structure. Must not be NULL. + * @param[in] baudrate Baud rate in bits per second, or -1 to retain the current setting. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_set_config_baudrate(struct sp_port_config *config, int baudrate); + +/** + * Set the data bits for the specified serial port. + * + * @param[in] port Pointer to a port structure. Must not be NULL. + * @param[in] bits Number of data bits. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_set_bits(struct sp_port *port, int bits); + +/** + * Get the data bits from a port configuration. + * + * The user should allocate a variable of type int and + * pass a pointer to this to receive the result. + * + * @param[in] config Pointer to a configuration structure. Must not be NULL. + * @param[out] bits_ptr Pointer to a variable to store the result. Must not be NULL. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_get_config_bits(const struct sp_port_config *config, int *bits_ptr); + +/** + * Set the data bits in a port configuration. + * + * @param[in] config Pointer to a configuration structure. Must not be NULL. + * @param[in] bits Number of data bits, or -1 to retain the current setting. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_set_config_bits(struct sp_port_config *config, int bits); + +/** + * Set the parity setting for the specified serial port. + * + * @param[in] port Pointer to a port structure. Must not be NULL. + * @param[in] parity Parity setting. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_set_parity(struct sp_port *port, enum sp_parity parity); + +/** + * Get the parity setting from a port configuration. + * + * The user should allocate a variable of type enum sp_parity and + * pass a pointer to this to receive the result. + * + * @param[in] config Pointer to a configuration structure. Must not be NULL. + * @param[out] parity_ptr Pointer to a variable to store the result. Must not be NULL. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_get_config_parity(const struct sp_port_config *config, enum sp_parity *parity_ptr); + +/** + * Set the parity setting in a port configuration. + * + * @param[in] config Pointer to a configuration structure. Must not be NULL. + * @param[in] parity Parity setting, or -1 to retain the current setting. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_set_config_parity(struct sp_port_config *config, enum sp_parity parity); + +/** + * Set the stop bits for the specified serial port. + * + * @param[in] port Pointer to a port structure. Must not be NULL. + * @param[in] stopbits Number of stop bits. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_set_stopbits(struct sp_port *port, int stopbits); + +/** + * Get the stop bits from a port configuration. + * + * The user should allocate a variable of type int and + * pass a pointer to this to receive the result. + * + * @param[in] config Pointer to a configuration structure. Must not be NULL. + * @param[out] stopbits_ptr Pointer to a variable to store the result. Must not be NULL. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_get_config_stopbits(const struct sp_port_config *config, int *stopbits_ptr); + +/** + * Set the stop bits in a port configuration. + * + * @param[in] config Pointer to a configuration structure. Must not be NULL. + * @param[in] stopbits Number of stop bits, or -1 to retain the current setting. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_set_config_stopbits(struct sp_port_config *config, int stopbits); + +/** + * Set the RTS pin behaviour for the specified serial port. + * + * @param[in] port Pointer to a port structure. Must not be NULL. + * @param[in] rts RTS pin mode. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_set_rts(struct sp_port *port, enum sp_rts rts); + +/** + * Get the RTS pin behaviour from a port configuration. + * + * The user should allocate a variable of type enum sp_rts and + * pass a pointer to this to receive the result. + * + * @param[in] config Pointer to a configuration structure. Must not be NULL. + * @param[out] rts_ptr Pointer to a variable to store the result. Must not be NULL. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_get_config_rts(const struct sp_port_config *config, enum sp_rts *rts_ptr); + +/** + * Set the RTS pin behaviour in a port configuration. + * + * @param[in] config Pointer to a configuration structure. Must not be NULL. + * @param[in] rts RTS pin mode, or -1 to retain the current setting. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_set_config_rts(struct sp_port_config *config, enum sp_rts rts); + +/** + * Set the CTS pin behaviour for the specified serial port. + * + * @param[in] port Pointer to a port structure. Must not be NULL. + * @param[in] cts CTS pin mode. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_set_cts(struct sp_port *port, enum sp_cts cts); + +/** + * Get the CTS pin behaviour from a port configuration. + * + * The user should allocate a variable of type enum sp_cts and + * pass a pointer to this to receive the result. + * + * @param[in] config Pointer to a configuration structure. Must not be NULL. + * @param[out] cts_ptr Pointer to a variable to store the result. Must not be NULL. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_get_config_cts(const struct sp_port_config *config, enum sp_cts *cts_ptr); + +/** + * Set the CTS pin behaviour in a port configuration. + * + * @param[in] config Pointer to a configuration structure. Must not be NULL. + * @param[in] cts CTS pin mode, or -1 to retain the current setting. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_set_config_cts(struct sp_port_config *config, enum sp_cts cts); + +/** + * Set the DTR pin behaviour for the specified serial port. + * + * @param[in] port Pointer to a port structure. Must not be NULL. + * @param[in] dtr DTR pin mode. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_set_dtr(struct sp_port *port, enum sp_dtr dtr); + +/** + * Get the DTR pin behaviour from a port configuration. + * + * The user should allocate a variable of type enum sp_dtr and + * pass a pointer to this to receive the result. + * + * @param[in] config Pointer to a configuration structure. Must not be NULL. + * @param[out] dtr_ptr Pointer to a variable to store the result. Must not be NULL. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_get_config_dtr(const struct sp_port_config *config, enum sp_dtr *dtr_ptr); + +/** + * Set the DTR pin behaviour in a port configuration. + * + * @param[in] config Pointer to a configuration structure. Must not be NULL. + * @param[in] dtr DTR pin mode, or -1 to retain the current setting. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_set_config_dtr(struct sp_port_config *config, enum sp_dtr dtr); + +/** + * Set the DSR pin behaviour for the specified serial port. + * + * @param[in] port Pointer to a port structure. Must not be NULL. + * @param[in] dsr DSR pin mode. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_set_dsr(struct sp_port *port, enum sp_dsr dsr); + +/** + * Get the DSR pin behaviour from a port configuration. + * + * The user should allocate a variable of type enum sp_dsr and + * pass a pointer to this to receive the result. + * + * @param[in] config Pointer to a configuration structure. Must not be NULL. + * @param[out] dsr_ptr Pointer to a variable to store the result. Must not be NULL. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_get_config_dsr(const struct sp_port_config *config, enum sp_dsr *dsr_ptr); + +/** + * Set the DSR pin behaviour in a port configuration. + * + * @param[in] config Pointer to a configuration structure. Must not be NULL. + * @param[in] dsr DSR pin mode, or -1 to retain the current setting. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_set_config_dsr(struct sp_port_config *config, enum sp_dsr dsr); + +/** + * Set the XON/XOFF configuration for the specified serial port. + * + * @param[in] port Pointer to a port structure. Must not be NULL. + * @param[in] xon_xoff XON/XOFF mode. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_set_xon_xoff(struct sp_port *port, enum sp_xonxoff xon_xoff); + +/** + * Get the XON/XOFF configuration from a port configuration. + * + * The user should allocate a variable of type enum sp_xonxoff and + * pass a pointer to this to receive the result. + * + * @param[in] config Pointer to a configuration structure. Must not be NULL. + * @param[out] xon_xoff_ptr Pointer to a variable to store the result. Must not be NULL. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_get_config_xon_xoff(const struct sp_port_config *config, enum sp_xonxoff *xon_xoff_ptr); + +/** + * Set the XON/XOFF configuration in a port configuration. + * + * @param[in] config Pointer to a configuration structure. Must not be NULL. + * @param[in] xon_xoff XON/XOFF mode, or -1 to retain the current setting. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_set_config_xon_xoff(struct sp_port_config *config, enum sp_xonxoff xon_xoff); + +/** + * Set the flow control type in a port configuration. + * + * This function is a wrapper that sets the RTS, CTS, DTR, DSR and + * XON/XOFF settings as necessary for the specified flow control + * type. For more fine-grained control of these settings, use their + * individual configuration functions. + * + * @param[in] config Pointer to a configuration structure. Must not be NULL. + * @param[in] flowcontrol Flow control setting to use. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_set_config_flowcontrol(struct sp_port_config *config, enum sp_flowcontrol flowcontrol); + +/** + * Set the flow control type for the specified serial port. + * + * This function is a wrapper that sets the RTS, CTS, DTR, DSR and + * XON/XOFF settings as necessary for the specified flow control + * type. For more fine-grained control of these settings, use their + * individual configuration functions. + * + * @param[in] port Pointer to a port structure. Must not be NULL. + * @param[in] flowcontrol Flow control setting to use. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_set_flowcontrol(struct sp_port *port, enum sp_flowcontrol flowcontrol); + +/** + * @} + * + * @defgroup Data Data handling + * + * Reading, writing, and flushing data. + * + * @{ + */ + +/** + * Read bytes from the specified serial port, blocking until complete. + * + * @warning If your program runs on Unix, defines its own signal handlers, and + * needs to abort blocking reads when these are called, then you + * should not use this function. It repeats system calls that return + * with EINTR. To be able to abort a read from a signal handler, you + * should implement your own blocking read using sp_nonblocking_read() + * together with a blocking method that makes sense for your program. + * E.g. you can obtain the file descriptor for an open port using + * sp_get_port_handle() and use this to call select() or pselect(), + * with appropriate arrangements to return if a signal is received. + * + * @param[in] port Pointer to a port structure. Must not be NULL. + * @param[out] buf Buffer in which to store the bytes read. Must not be NULL. + * @param[in] count Requested number of bytes to read. + * @param[in] timeout_ms Timeout in milliseconds, or zero to wait indefinitely. + * + * @return The number of bytes read on success, or a negative error code. If + * the number of bytes returned is less than that requested, the + * timeout was reached before the requested number of bytes was + * available. If timeout is zero, the function will always return + * either the requested number of bytes or a negative error code. + * + * @since 0.1.0 + */ +enum sp_return sp_blocking_read(struct sp_port *port, void *buf, size_t count, unsigned int timeout_ms); + +/** + * Read bytes from the specified serial port, returning as soon as any data is + * available. + * + * @warning If your program runs on Unix, defines its own signal handlers, and + * needs to abort blocking reads when these are called, then you + * should not use this function. It repeats system calls that return + * with EINTR. To be able to abort a read from a signal handler, you + * should implement your own blocking read using sp_nonblocking_read() + * together with a blocking method that makes sense for your program. + * E.g. you can obtain the file descriptor for an open port using + * sp_get_port_handle() and use this to call select() or pselect(), + * with appropriate arrangements to return if a signal is received. + * + * @param[in] port Pointer to a port structure. Must not be NULL. + * @param[out] buf Buffer in which to store the bytes read. Must not be NULL. + * @param[in] count Maximum number of bytes to read. Must not be zero. + * @param[in] timeout_ms Timeout in milliseconds, or zero to wait indefinitely. + * + * @return The number of bytes read on success, or a negative error code. If + * the result is zero, the timeout was reached before any bytes were + * available. If timeout_ms is zero, the function will always return + * either at least one byte, or a negative error code. + * + * @since 0.1.1 + */ +enum sp_return sp_blocking_read_next(struct sp_port *port, void *buf, size_t count, unsigned int timeout_ms); + +/** + * Read bytes from the specified serial port, without blocking. + * + * @param[in] port Pointer to a port structure. Must not be NULL. + * @param[out] buf Buffer in which to store the bytes read. Must not be NULL. + * @param[in] count Maximum number of bytes to read. + * + * @return The number of bytes read on success, or a negative error code. The + * number of bytes returned may be any number from zero to the maximum + * that was requested. + * + * @since 0.1.0 + */ +enum sp_return sp_nonblocking_read(struct sp_port *port, void *buf, size_t count); + +/** + * Write bytes to the specified serial port, blocking until complete. + * + * Note that this function only ensures that the accepted bytes have been + * written to the OS; they may be held in driver or hardware buffers and not + * yet physically transmitted. To check whether all written bytes have actually + * been transmitted, use the sp_output_waiting() function. To wait until all + * written bytes have actually been transmitted, use the sp_drain() function. + * + * @warning If your program runs on Unix, defines its own signal handlers, and + * needs to abort blocking writes when these are called, then you + * should not use this function. It repeats system calls that return + * with EINTR. To be able to abort a write from a signal handler, you + * should implement your own blocking write using sp_nonblocking_write() + * together with a blocking method that makes sense for your program. + * E.g. you can obtain the file descriptor for an open port using + * sp_get_port_handle() and use this to call select() or pselect(), + * with appropriate arrangements to return if a signal is received. + * + * @param[in] port Pointer to a port structure. Must not be NULL. + * @param[in] buf Buffer containing the bytes to write. Must not be NULL. + * @param[in] count Requested number of bytes to write. + * @param[in] timeout_ms Timeout in milliseconds, or zero to wait indefinitely. + * + * @return The number of bytes written on success, or a negative error code. + * If the number of bytes returned is less than that requested, the + * timeout was reached before the requested number of bytes was + * written. If timeout is zero, the function will always return + * either the requested number of bytes or a negative error code. In + * the event of an error there is no way to determine how many bytes + * were sent before the error occurred. + * + * @since 0.1.0 + */ +enum sp_return sp_blocking_write(struct sp_port *port, const void *buf, size_t count, unsigned int timeout_ms); + +/** + * Write bytes to the specified serial port, without blocking. + * + * Note that this function only ensures that the accepted bytes have been + * written to the OS; they may be held in driver or hardware buffers and not + * yet physically transmitted. To check whether all written bytes have actually + * been transmitted, use the sp_output_waiting() function. To wait until all + * written bytes have actually been transmitted, use the sp_drain() function. + * + * @param[in] port Pointer to a port structure. Must not be NULL. + * @param[in] buf Buffer containing the bytes to write. Must not be NULL. + * @param[in] count Maximum number of bytes to write. + * + * @return The number of bytes written on success, or a negative error code. + * The number of bytes returned may be any number from zero to the + * maximum that was requested. + * + * @since 0.1.0 + */ +enum sp_return sp_nonblocking_write(struct sp_port *port, const void *buf, size_t count); + +/** + * Gets the number of bytes waiting in the input buffer. + * + * @param[in] port Pointer to a port structure. Must not be NULL. + * + * @return Number of bytes waiting on success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_input_waiting(struct sp_port *port); + +/** + * Gets the number of bytes waiting in the output buffer. + * + * @param[in] port Pointer to a port structure. Must not be NULL. + * + * @return Number of bytes waiting on success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_output_waiting(struct sp_port *port); + +/** + * Flush serial port buffers. Data in the selected buffer(s) is discarded. + * + * @param[in] port Pointer to a port structure. Must not be NULL. + * @param[in] buffers Which buffer(s) to flush. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_flush(struct sp_port *port, enum sp_buffer buffers); + +/** + * Wait for buffered data to be transmitted. + * + * @warning If your program runs on Unix, defines its own signal handlers, and + * needs to abort draining the output buffer when when these are + * called, then you should not use this function. It repeats system + * calls that return with EINTR. To be able to abort a drain from a + * signal handler, you would need to implement your own blocking + * drain by polling the result of sp_output_waiting(). + * + * @param[in] port Pointer to a port structure. Must not be NULL. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_drain(struct sp_port *port); + +/** + * @} + * + * @defgroup Waiting Waiting + * + * Waiting for events and timeout handling. + * + * @{ + */ + +/** + * Allocate storage for a set of events. + * + * The user should allocate a variable of type struct sp_event_set *, + * then pass a pointer to this variable to receive the result. + * + * The result should be freed after use by calling sp_free_event_set(). + * + * @param[out] result_ptr If any error is returned, the variable pointed to by + * result_ptr will be set to NULL. Otherwise, it will + * be set to point to the event set. Must not be NULL. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_new_event_set(struct sp_event_set **result_ptr); + +/** + * Add events to a struct sp_event_set for a given port. + * + * The port must first be opened by calling sp_open() using the same port + * structure. + * + * After the port is closed or the port structure freed, the results may + * no longer be valid. + * + * @param[in,out] event_set Event set to update. Must not be NULL. + * @param[in] port Pointer to a port structure. Must not be NULL. + * @param[in] mask Bitmask of events to be waited for. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_add_port_events(struct sp_event_set *event_set, + const struct sp_port *port, enum sp_event mask); + +/** + * Wait for any of a set of events to occur. + * + * @param[in] event_set Event set to wait on. Must not be NULL. + * @param[in] timeout_ms Timeout in milliseconds, or zero to wait indefinitely. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_wait(struct sp_event_set *event_set, unsigned int timeout_ms); + +/** + * Free a structure allocated by sp_new_event_set(). + * + * @param[in] event_set Event set to free. Must not be NULL. + * + * @since 0.1.0 + */ +void sp_free_event_set(struct sp_event_set *event_set); + +/** + * @} + * + * @defgroup Signals Signals + * + * Port signalling operations. + * + * @{ + */ + +/** + * Gets the status of the control signals for the specified port. + * + * The user should allocate a variable of type "enum sp_signal" and pass a + * pointer to this variable to receive the result. The result is a bitmask + * in which individual signals can be checked by bitwise OR with values of + * the sp_signal enum. + * + * @param[in] port Pointer to a port structure. Must not be NULL. + * @param[out] signal_mask Pointer to a variable to receive the result. + * Must not be NULL. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_get_signals(struct sp_port *port, enum sp_signal *signal_mask); + +/** + * Put the port transmit line into the break state. + * + * @param[in] port Pointer to a port structure. Must not be NULL. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_start_break(struct sp_port *port); + +/** + * Take the port transmit line out of the break state. + * + * @param[in] port Pointer to a port structure. Must not be NULL. + * + * @return SP_OK upon success, a negative error code otherwise. + * + * @since 0.1.0 + */ +enum sp_return sp_end_break(struct sp_port *port); + +/** + * @} + * + * @defgroup Errors Errors + * + * Obtaining error information. + * + * @{ + */ + +/** + * Get the error code for a failed operation. + * + * In order to obtain the correct result, this function should be called + * straight after the failure, before executing any other system operations. + * The result is thread-specific, and only valid when called immediately + * after a previous call returning SP_ERR_FAIL. + * + * @return The system's numeric code for the error that caused the last + * operation to fail. + * + * @since 0.1.0 + */ +int sp_last_error_code(void); + +/** + * Get the error message for a failed operation. + * + * In order to obtain the correct result, this function should be called + * straight after the failure, before executing other system operations. + * The result is thread-specific, and only valid when called immediately + * after a previous call returning SP_ERR_FAIL. + * + * @return The system's message for the error that caused the last + * operation to fail. This string may be allocated by the function, + * and should be freed after use by calling sp_free_error_message(). + * + * @since 0.1.0 + */ +char *sp_last_error_message(void); + +/** + * Free an error message returned by sp_last_error_message(). + * + * @param[in] message The error message string to free. Must not be NULL. + * + * @since 0.1.0 + */ +void sp_free_error_message(char *message); + +/** + * Set the handler function for library debugging messages. + * + * Debugging messages are generated by the library during each operation, + * to help in diagnosing problems. The handler will be called for each + * message. The handler can be set to NULL to ignore all debug messages. + * + * The handler function should accept a format string and variable length + * argument list, in the same manner as e.g. printf(). + * + * The default handler is sp_default_debug_handler(). + * + * @param[in] handler The handler function to use. Can be NULL (in that case + * all debug messages will be ignored). + * + * @since 0.1.0 + */ +void sp_set_debug_handler(void (*handler)(const char *format, ...)); + +/** + * Default handler function for library debugging messages. + * + * This function prints debug messages to the standard error stream if the + * environment variable LIBSERIALPORT_DEBUG is set. Otherwise, they are + * ignored. + * + * @param[in] format The format string to use. Must not be NULL. + * @param[in] ... The variable length argument list to use. + * + * @since 0.1.0 + */ +void sp_default_debug_handler(const char *format, ...); + +/** @} */ + +/** + * @defgroup Versions Versions + * + * Version number querying functions, definitions, and macros. + * + * This set of API calls returns two different version numbers related + * to libserialport. The "package version" is the release version number of the + * libserialport tarball in the usual "major.minor.micro" format, e.g. "0.1.0". + * + * The "library version" is independent of that; it is the libtool version + * number in the "current:revision:age" format, e.g. "2:0:0". + * See http://www.gnu.org/software/libtool/manual/libtool.html#Libtool-versioning for details. + * + * Both version numbers (and/or individual components of them) can be + * retrieved via the API calls at runtime, and/or they can be checked at + * compile/preprocessor time using the respective macros. + * + * @{ + */ + +/* + * Package version macros (can be used for conditional compilation). + */ + +/** The libserialport package 'major' version number. */ +#undef SP_PACKAGE_VERSION_MAJOR + +/** The libserialport package 'minor' version number. */ +#undef SP_PACKAGE_VERSION_MINOR + +/** The libserialport package 'micro' version number. */ +#undef SP_PACKAGE_VERSION_MICRO + +/** The libserialport package version ("major.minor.micro") as string. */ +#undef SP_PACKAGE_VERSION_STRING + +/* + * Library/libtool version macros (can be used for conditional compilation). + */ + +/** The libserialport libtool 'current' version number. */ +#undef SP_LIB_VERSION_CURRENT + +/** The libserialport libtool 'revision' version number. */ +#undef SP_LIB_VERSION_REVISION + +/** The libserialport libtool 'age' version number. */ +#undef SP_LIB_VERSION_AGE + +/** The libserialport libtool version ("current:revision:age") as string. */ +#undef SP_LIB_VERSION_STRING + +/** + * Get the major libserialport package version number. + * + * @return The major package version number. + * + * @since 0.1.0 + */ +int sp_get_major_package_version(void); + +/** + * Get the minor libserialport package version number. + * + * @return The minor package version number. + * + * @since 0.1.0 + */ +int sp_get_minor_package_version(void); + +/** + * Get the micro libserialport package version number. + * + * @return The micro package version number. + * + * @since 0.1.0 + */ +int sp_get_micro_package_version(void); + +/** + * Get the libserialport package version number as a string. + * + * @return The package version number string. The returned string is + * static and thus should NOT be free'd by the caller. + * + * @since 0.1.0 + */ +const char *sp_get_package_version_string(void); + +/** + * Get the "current" part of the libserialport library version number. + * + * @return The "current" library version number. + * + * @since 0.1.0 + */ +int sp_get_current_lib_version(void); + +/** + * Get the "revision" part of the libserialport library version number. + * + * @return The "revision" library version number. + * + * @since 0.1.0 + */ +int sp_get_revision_lib_version(void); + +/** + * Get the "age" part of the libserialport library version number. + * + * @return The "age" library version number. + * + * @since 0.1.0 + */ +int sp_get_age_lib_version(void); + +/** + * Get the libserialport library version number as a string. + * + * @return The library version number string. The returned string is + * static and thus should NOT be free'd by the caller. + * + * @since 0.1.0 + */ +const char *sp_get_lib_version_string(void); + +/** @} */ + +#ifdef __cplusplus +} +#endif + +#endif