96 lines
2.4 KiB
C
96 lines
2.4 KiB
C
/*
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* This file is part of the sigrok project.
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*
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* Copyright (C) 2010-2012 Bert Vermeulen <bert@biot.com>
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* Copyright (C) 2012 Peter Stuge <peter@stuge.se>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <glib.h>
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#include "libsigrok.h"
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#include "libsigrok-internal.h"
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/**
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* Initialize libsigrok.
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*
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* This function must be called before any other libsigrok function.
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*
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* @param ctx Pointer to a libsigrok context struct pointer. Must not be NULL.
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* This will be a pointer to a newly allocated libsigrok context
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* object upon success, and is undefined upon errors.
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*
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* @return SR_OK upon success, a (negative) error code otherwise. Upon errors
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* the 'ctx' pointer is undefined and should not be used. Upon success,
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* the context will be free'd by sr_exit() as part of the libsigrok
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* shutdown.
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*/
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SR_API int sr_init(struct sr_context **ctx)
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{
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int ret = SR_ERR;
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struct sr_context *context;
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if (!ctx) {
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sr_err("%s(): libsigrok context was NULL.", __func__);
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return SR_ERR;
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}
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/* + 1 to handle when struct sr_context has no members. */
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context = g_try_malloc0(sizeof(struct sr_context) + 1);
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if (!context) {
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ret = SR_ERR_MALLOC;
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goto done;
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}
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#ifdef HAVE_LIBUSB_1_0
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ret = libusb_init(&context->libusb_ctx);
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if (LIBUSB_SUCCESS == ret) {
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sr_err("libusb_init() returned %s.\n", libusb_error_name(ret));
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goto done;
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}
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#endif
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*ctx = context;
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ret = SR_OK;
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done:
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return ret;
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}
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/**
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* Shutdown libsigrok.
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*
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* @param ctx Pointer to a libsigrok context struct. Must not be NULL.
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*
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* @return SR_OK upon success, a (negative) error code otherwise.
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*/
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SR_API int sr_exit(struct sr_context *ctx)
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{
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if (!ctx) {
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sr_err("%s(): libsigrok context was NULL.", __func__);
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return SR_ERR;
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}
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sr_hw_cleanup_all();
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#ifdef HAVE_LIBUSB_1_0
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libusb_exit(ctx->libusb_ctx);
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#endif
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g_free(ctx);
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return SR_OK;
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}
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