2 * This file is part of the libsigrok project.
4 * Copyright (C) 2011-2012 Uwe Hermann <uwe@hermann-uwe.de>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
23 #include <libsigrok/libsigrok.h>
24 #include "libsigrok-internal.h"
26 #define LOG_PREFIX "log"
31 * Controlling the libsigrok message logging functionality.
35 * @defgroup grp_logging Logging
37 * Controlling the libsigrok message logging functionality.
42 /* Currently selected libsigrok loglevel. Default: SR_LOG_WARN. */
43 static int cur_loglevel = SR_LOG_WARN; /* Show errors+warnings per default. */
45 /* Function prototype. */
46 static int sr_logv(void *cb_data, int loglevel, const char *format,
49 /* Pointer to the currently selected log callback. Default: sr_logv(). */
50 static sr_log_callback sr_log_cb = sr_logv;
53 * Pointer to private data that can be passed to the log callback.
54 * This can be used (for example) by C++ GUIs to pass a "this" pointer.
56 static void *sr_log_cb_data = NULL;
59 #define LOGLEVEL_TIMESTAMP SR_LOG_DBG
61 static int64_t sr_log_start_time = 0;
64 * Set the libsigrok loglevel.
66 * This influences the amount of log messages (debug messages, error messages,
67 * and so on) libsigrok will output. Using SR_LOG_NONE disables all messages.
69 * Note that this function itself will also output log messages. After the
70 * loglevel has changed, it will output a debug message with SR_LOG_DBG for
71 * example. Whether this message is shown depends on the (new) loglevel.
73 * @param loglevel The loglevel to set (SR_LOG_NONE, SR_LOG_ERR, SR_LOG_WARN,
74 * SR_LOG_INFO, SR_LOG_DBG, or SR_LOG_SPEW).
76 * @return SR_OK upon success, SR_ERR_ARG upon invalid loglevel.
80 SR_API int sr_log_loglevel_set(int loglevel)
82 if (loglevel < SR_LOG_NONE || loglevel > SR_LOG_SPEW) {
83 sr_err("Invalid loglevel %d.", loglevel);
86 /* Output time stamps relative to time at startup */
87 if (loglevel >= LOGLEVEL_TIMESTAMP && sr_log_start_time == 0)
88 sr_log_start_time = g_get_monotonic_time();
90 cur_loglevel = loglevel;
92 sr_dbg("libsigrok loglevel set to %d.", loglevel);
98 * Get the libsigrok loglevel.
100 * @return The currently configured libsigrok loglevel.
104 SR_API int sr_log_loglevel_get(void)
110 * Set the libsigrok log callback to the specified function.
112 * @param cb Function pointer to the log callback function to use.
114 * @param cb_data Pointer to private data to be passed on. This can be used by
115 * the caller to pass arbitrary data to the log functions. This
116 * pointer is only stored or passed on by libsigrok, and is
117 * never used or interpreted in any way. The pointer is allowed
118 * to be NULL if the caller doesn't need/want to pass any data.
120 * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments.
124 SR_API int sr_log_callback_set(sr_log_callback cb, void *cb_data)
127 sr_err("%s: cb was NULL", __func__);
131 /* Note: 'cb_data' is allowed to be NULL. */
134 sr_log_cb_data = cb_data;
140 * Set the libsigrok log callback to the default built-in one.
142 * Additionally, the internal 'sr_log_cb_data' pointer is set to NULL.
144 * @return SR_OK upon success, a negative error code otherwise.
148 SR_API int sr_log_callback_set_default(void)
151 * Note: No log output in this function, as it should safely work
152 * even if the currently set log callback is buggy/broken.
155 sr_log_cb_data = NULL;
160 static int sr_logv(void *cb_data, int loglevel, const char *format, va_list args)
162 uint64_t elapsed_us, minutes;
163 unsigned int rest_us, seconds, microseconds;
165 /* This specific log callback doesn't need the void pointer data. */
168 /* Only output messages of at least the selected loglevel(s). */
169 if (loglevel > cur_loglevel)
172 if (cur_loglevel >= LOGLEVEL_TIMESTAMP) {
173 elapsed_us = g_get_monotonic_time() - sr_log_start_time;
175 minutes = elapsed_us / G_TIME_SPAN_MINUTE;
176 rest_us = elapsed_us % G_TIME_SPAN_MINUTE;
177 seconds = rest_us / G_TIME_SPAN_SECOND;
178 microseconds = rest_us % G_TIME_SPAN_SECOND;
180 if (fprintf(stderr, "[%.2" PRIu64 ":%.2u.%.6u] ",
181 minutes, seconds, microseconds) < 0)
184 if (vfprintf(stderr, format, args) < 0)
186 if (putc('\n', stderr) < 0)
193 SR_PRIV int sr_log(int loglevel, const char *format, ...)
198 va_start(args, format);
199 ret = sr_log_cb(sr_log_cb_data, loglevel, format, args);