/*
* This file is part of the libserialport project.
*
+ * Copyright (C) 2013 Martin Ling <martin-libserialport@earth.li>
* Copyright (C) 2014 Aurelien Jacobs <aurel@gnuage.org>
*
* This program is free software: you can redistribute it and/or modify
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
+#include <config.h>
#include "libserialport.h"
#include "libserialport_internal.h"
-enum sp_return get_port_details(struct sp_port *port)
+/*
+ * The 'e' modifier for O_CLOEXEC is glibc >= 2.7 only, hence not
+ * portable, so provide an own wrapper for this functionality.
+ */
+static FILE *fopen_cloexec_rdonly(const char *pathname)
+{
+ int fd;
+ if ((fd = open(pathname, O_RDONLY | O_CLOEXEC)) < 0)
+ return NULL;
+ return fdopen(fd, "r");
+}
+
+SP_PRIV enum sp_return get_port_details(struct sp_port *port)
{
- /* Description limited to 127 char,
- anything longer would not be user friendly anyway */
+ /*
+ * Description limited to 127 char, anything longer
+ * would not be user friendly anyway.
+ */
char description[128];
- int bus, address, vid, pid = -1;
+ int bus, address;
+ unsigned int vid, pid;
char manufacturer[128], product[128], serial[128];
char baddr[32];
const char dir_name[] = "/sys/class/tty/%s/device/%s%s";
- char sub_dir[32] = "", file_name[PATH_MAX];
+ char sub_dir[32] = "", link_name[PATH_MAX], file_name[PATH_MAX];
char *ptr, *dev = port->name + 5;
FILE *file;
int i, count;
+ struct stat statbuf;
if (strncmp(port->name, "/dev/", 5))
- RETURN_ERROR(SP_ERR_ARG, "Device name not recognized (%s)", port->name);
+ RETURN_ERROR(SP_ERR_ARG, "Device name not recognized");
- snprintf(file_name, sizeof(file_name), "/sys/class/tty/%s", dev);
- count = readlink(file_name, file_name, sizeof(file_name));
- if (count <= 0 || count >= (int) sizeof(file_name)-1)
- RETURN_ERROR(SP_ERR_ARG, "Device not found (%s)", port->name);
+ snprintf(link_name, sizeof(link_name), "/sys/class/tty/%s", dev);
+ if (lstat(link_name, &statbuf) == -1)
+ RETURN_ERROR(SP_ERR_ARG, "Device not found");
+ if (!S_ISLNK(statbuf.st_mode))
+ snprintf(link_name, sizeof(link_name), "/sys/class/tty/%s/device", dev);
+ count = readlink(link_name, file_name, sizeof(file_name));
+ if (count <= 0 || count >= (int)(sizeof(file_name) - 1))
+ RETURN_ERROR(SP_ERR_ARG, "Device not found");
file_name[count] = 0;
if (strstr(file_name, "bluetooth"))
port->transport = SP_TRANSPORT_BLUETOOTH;
port->transport = SP_TRANSPORT_USB;
if (port->transport == SP_TRANSPORT_USB) {
- for (i=0; i<5; i++) {
+ for (i = 0; i < 5; i++) {
strcat(sub_dir, "../");
snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "busnum");
- if (!(file = fopen(file_name, "r")))
+ if (!(file = fopen_cloexec_rdonly(file_name)))
continue;
count = fscanf(file, "%d", &bus);
fclose(file);
continue;
snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "devnum");
- if (!(file = fopen(file_name, "r")))
+ if (!(file = fopen_cloexec_rdonly(file_name)))
continue;
count = fscanf(file, "%d", &address);
fclose(file);
continue;
snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "idVendor");
- if (!(file = fopen(file_name, "r")))
+ if (!(file = fopen_cloexec_rdonly(file_name)))
continue;
count = fscanf(file, "%4x", &vid);
fclose(file);
continue;
snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "idProduct");
- if (!(file = fopen(file_name, "r")))
+ if (!(file = fopen_cloexec_rdonly(file_name)))
continue;
count = fscanf(file, "%4x", &pid);
fclose(file);
port->usb_pid = pid;
snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "product");
- if ((file = fopen(file_name, "r"))) {
+ if ((file = fopen_cloexec_rdonly(file_name))) {
if ((ptr = fgets(description, sizeof(description), file))) {
ptr = description + strlen(description) - 1;
if (ptr >= description && *ptr == '\n')
port->description = strdup(dev);
snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "manufacturer");
- if ((file = fopen(file_name, "r"))) {
+ if ((file = fopen_cloexec_rdonly(file_name))) {
if ((ptr = fgets(manufacturer, sizeof(manufacturer), file))) {
ptr = manufacturer + strlen(manufacturer) - 1;
if (ptr >= manufacturer && *ptr == '\n')
}
snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "product");
- if ((file = fopen(file_name, "r"))) {
+ if ((file = fopen_cloexec_rdonly(file_name))) {
if ((ptr = fgets(product, sizeof(product), file))) {
ptr = product + strlen(product) - 1;
if (ptr >= product && *ptr == '\n')
}
snprintf(file_name, sizeof(file_name), dir_name, dev, sub_dir, "serial");
- if ((file = fopen(file_name, "r"))) {
+ if ((file = fopen_cloexec_rdonly(file_name))) {
if ((ptr = fgets(serial, sizeof(serial), file))) {
ptr = serial + strlen(serial) - 1;
if (ptr >= serial && *ptr == '\n')
fclose(file);
}
+ /* If present, add serial to description for better identification. */
+ if (port->usb_serial && strlen(port->usb_serial)) {
+ snprintf(description, sizeof(description),
+ "%s - %s", port->description, port->usb_serial);
+ if (port->description)
+ free(port->description);
+ port->description = strdup(description);
+ }
+
break;
}
} else {
if (port->transport == SP_TRANSPORT_BLUETOOTH) {
snprintf(file_name, sizeof(file_name), dir_name, dev, "", "address");
- if ((file = fopen(file_name, "r"))) {
+ if ((file = fopen_cloexec_rdonly(file_name))) {
if ((ptr = fgets(baddr, sizeof(baddr), file))) {
ptr = baddr + strlen(baddr) - 1;
if (ptr >= baddr && *ptr == '\n')
RETURN_OK();
}
+
+SP_PRIV enum sp_return list_ports(struct sp_port ***list)
+{
+ char name[PATH_MAX], target[PATH_MAX];
+ struct dirent *entry;
+#ifdef HAVE_STRUCT_SERIAL_STRUCT
+ struct serial_struct serial_info;
+ int ioctl_result;
+#endif
+ char buf[sizeof(entry->d_name) + 23];
+ int len, fd;
+ DIR *dir;
+ int ret = SP_OK;
+ struct stat statbuf;
+
+ DEBUG("Enumerating tty devices");
+ if (!(dir = opendir("/sys/class/tty")))
+ RETURN_FAIL("Could not open /sys/class/tty");
+
+ DEBUG("Iterating over results");
+ while ((entry = readdir(dir))) {
+ snprintf(buf, sizeof(buf), "/sys/class/tty/%s", entry->d_name);
+ if (lstat(buf, &statbuf) == -1)
+ continue;
+ if (!S_ISLNK(statbuf.st_mode))
+ snprintf(buf, sizeof(buf), "/sys/class/tty/%s/device", entry->d_name);
+ len = readlink(buf, target, sizeof(target));
+ if (len <= 0 || len >= (int)(sizeof(target) - 1))
+ continue;
+ target[len] = 0;
+ if (strstr(target, "virtual"))
+ continue;
+ snprintf(name, sizeof(name), "/dev/%s", entry->d_name);
+ DEBUG_FMT("Found device %s", name);
+ if (strstr(target, "serial8250")) {
+ /*
+ * The serial8250 driver has a hardcoded number of ports.
+ * The only way to tell which actually exist on a given system
+ * is to try to open them and make an ioctl call.
+ */
+ DEBUG("serial8250 device, attempting to open");
+ if ((fd = open(name, O_RDWR | O_NONBLOCK | O_NOCTTY | O_CLOEXEC)) < 0) {
+ DEBUG("Open failed, skipping");
+ continue;
+ }
+#ifdef HAVE_STRUCT_SERIAL_STRUCT
+ ioctl_result = ioctl(fd, TIOCGSERIAL, &serial_info);
+#endif
+ close(fd);
+#ifdef HAVE_STRUCT_SERIAL_STRUCT
+ if (ioctl_result != 0) {
+ DEBUG("ioctl failed, skipping");
+ continue;
+ }
+ if (serial_info.type == PORT_UNKNOWN) {
+ DEBUG("Port type is unknown, skipping");
+ continue;
+ }
+#endif
+ }
+ DEBUG_FMT("Found port %s", name);
+ *list = list_append(*list, name);
+ if (!*list) {
+ SET_ERROR(ret, SP_ERR_MEM, "List append failed");
+ break;
+ }
+ }
+ closedir(dir);
+
+ return ret;
+}
projects / libserialport.git / blobdiff