X-Git-Url: http://sigrok.org/gitweb/?p=libsigrok.git;a=blobdiff_plain;f=backend.c;h=0ba05958cc78380caeed6800484f4113f7d50677;hp=4823044efce580dbc9d7a116f1eb46e63a84a389;hb=HEAD;hpb=545f9786390a89b8bb6868907afa555fc0a6ece4

diff --git a/backend.c b/backend.c
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-/*
- * This file is part of the sigrok project.
- *
- * Copyright (C) 2010-2012 Bert Vermeulen <bert@biot.com>
- * Copyright (C) 2012 Peter Stuge <peter@stuge.se>
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-#include <glib.h>
-#include "config.h" /* Needed for HAVE_LIBUSB_1_0 and others. */
-#include "libsigrok.h"
-#include "libsigrok-internal.h"
-
-/**
- * @mainpage libsigrok API
- *
- * @section sec_intro Introduction
- *
- * The <a href="http://sigrok.org">sigrok</a> project aims at creating a
- * portable, cross-platform, Free/Libre/Open-Source signal analysis software
- * suite that supports various device types (such as logic analyzers,
- * oscilloscopes, multimeters, and more).
- *
- * <a href="http://sigrok.org/wiki/Libsigrok">libsigrok</a> is a shared
- * library written in C which provides the basic API for talking to
- * <a href="http://sigrok.org/wiki/Supported_hardware">supported hardware</a>
- * and reading/writing the acquired data into various
- * <a href="http://sigrok.org/wiki/Input_output_formats">input/output
- * file formats</a>.
- *
- * @section sec_api API reference
- *
- * See the "Modules" page for an introduction to various libsigrok
- * related topics and the detailed API documentation of the respective
- * functions.
- *
- * You can also browse the API documentation by file, or review all
- * data structures.
- *
- * @section sec_mailinglists Mailing lists
- *
- * There are two mailing lists for sigrok/libsigrok: <a href="https://lists.sourceforge.net/lists/listinfo/sigrok-devel">sigrok-devel</a> and <a href="https://lists.sourceforge.net/lists/listinfo/sigrok-commits">sigrok-commits</a>.
- *
- * @section sec_irc IRC
- *
- * You can find the sigrok developers in the
- * <a href="irc://chat.freenode.net/sigrok">\#sigrok</a>
- * IRC channel on Freenode.
- *
- * @section sec_website Website
- *
- * <a href="http://sigrok.org/wiki/Libsigrok">sigrok.org/wiki/Libsigrok</a>
- */
-
-/**
- * @file
- *
- * Initializing and shutting down libsigrok.
- */
-
-/**
- * @defgroup grp_init Initialization
- *
- * Initializing and shutting down libsigrok.
- *
- * Before using any of the libsigrok functionality, sr_init() must
- * be called to initialize the library, which will return a struct sr_context
- * when the initialization was successful.
- *
- * When libsigrok functionality is no longer needed, sr_exit() should be
- * called, which will (among other things) free the struct sr_context.
- *
- * Example for a minimal program using libsigrok:
- *
- * @code{.c}
- *   #include <stdio.h>
- *   #include <libsigrok/libsigrok.h>
- *
- *   int main(int argc, char **argv)
- *   {
- *   	int ret;
- *   	struct sr_context *sr_ctx;
- *
- *   	if ((ret = sr_init(&sr_ctx)) != SR_OK) {
- *   		printf("Error initializing libsigrok (%s): %s.",
- *   		       sr_strerror_name(ret), sr_strerror(ret));
- *   		return 1;
- *   	}
- *
- *   	// Use libsigrok functions here...
- *
- *   	if ((ret = sr_exit(sr_ctx)) != SR_OK) {
- *   		printf("Error shutting down libsigrok (%s): %s.",
- *   		       sr_strerror_name(ret), sr_strerror(ret));
- *   		return 1;
- *   	}
- *
- *   	return 0;
- *   }
- * @endcode
- *
- * @{
- */
-
-/**
- * Initialize libsigrok.
- *
- * This function must be called before any other libsigrok function.
- *
- * @param ctx Pointer to a libsigrok context struct pointer. Must not be NULL.
- *            This will be a pointer to a newly allocated libsigrok context
- *            object upon success, and is undefined upon errors.
- *
- * @return SR_OK upon success, a (negative) error code otherwise. Upon errors
- *         the 'ctx' pointer is undefined and should not be used. Upon success,
- *         the context will be free'd by sr_exit() as part of the libsigrok
- *         shutdown.
- */
-SR_API int sr_init(struct sr_context **ctx)
-{
-	int ret = SR_ERR;
-	struct sr_context *context;
-
-	if (!ctx) {
-		sr_err("%s(): libsigrok context was NULL.", __func__);
-		return SR_ERR;
-	}
-
-	/* + 1 to handle when struct sr_context has no members. */
-	context = g_try_malloc0(sizeof(struct sr_context) + 1);
-
-	if (!context) {
-		ret = SR_ERR_MALLOC;
-		goto done;
-	}
-
-#ifdef HAVE_LIBUSB_1_0
-	ret = libusb_init(&context->libusb_ctx);
-	if (LIBUSB_SUCCESS != ret) {
-		sr_err("libusb_init() returned %s.\n", libusb_error_name(ret));
-		goto done;
-	}
-#endif
-
-	*ctx = context;
-	ret = SR_OK;
-
-done:
-	return ret;
-}
-
-/**
- * Shutdown libsigrok.
- *
- * @param ctx Pointer to a libsigrok context struct. Must not be NULL.
- *
- * @return SR_OK upon success, a (negative) error code otherwise.
- */
-SR_API int sr_exit(struct sr_context *ctx)
-{
-	if (!ctx) {
-		sr_err("%s(): libsigrok context was NULL.", __func__);
-		return SR_ERR;
-	}
-
-	sr_hw_cleanup_all();
-
-#ifdef HAVE_LIBUSB_1_0
-	libusb_exit(ctx->libusb_ctx);
-#endif
-
-	g_free(ctx);
-
-	return SR_OK;
-}
-
-/** @} */