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;
58 /* Log domain (a short string that is used as prefix for all messages). */
60 #define LOGDOMAIN_MAXLEN 30
61 #define LOGDOMAIN_DEFAULT "sr: "
63 static char sr_log_domain[LOGDOMAIN_MAXLEN + 1] = LOGDOMAIN_DEFAULT;
65 static int64_t sr_log_start_time = 0;
68 * Set the libsigrok loglevel.
70 * This influences the amount of log messages (debug messages, error messages,
71 * and so on) libsigrok will output. Using SR_LOG_NONE disables all messages.
73 * Note that this function itself will also output log messages. After the
74 * loglevel has changed, it will output a debug message with SR_LOG_DBG for
75 * example. Whether this message is shown depends on the (new) loglevel.
77 * @param loglevel The loglevel to set (SR_LOG_NONE, SR_LOG_ERR, SR_LOG_WARN,
78 * SR_LOG_INFO, SR_LOG_DBG, or SR_LOG_SPEW).
80 * @return SR_OK upon success, SR_ERR_ARG upon invalid loglevel.
84 SR_API int sr_log_loglevel_set(int loglevel)
86 if (loglevel < SR_LOG_NONE || loglevel > SR_LOG_SPEW) {
87 sr_err("Invalid loglevel %d.", loglevel);
90 /* Output time stamps relative to time at startup */
91 if (loglevel >= SR_LOG_SPEW && sr_log_start_time == 0)
92 sr_log_start_time = g_get_monotonic_time();
94 cur_loglevel = loglevel;
96 sr_dbg("libsigrok loglevel set to %d.", loglevel);
102 * Get the libsigrok loglevel.
104 * @return The currently configured libsigrok loglevel.
108 SR_API int sr_log_loglevel_get(void)
114 * Set the libsigrok logdomain string.
116 * @param logdomain The string to use as logdomain for libsigrok log
117 * messages from now on. Must not be NULL. The maximum
118 * length of the string is 30 characters (this does not
119 * include the trailing NUL-byte). Longer strings are
121 * In order to not use a logdomain, pass an empty string.
122 * The function makes its own copy of the input string, i.e.
123 * the caller does not need to keep it around.
125 * @retval SR_OK upon success.
126 * @retval SR_ERR_ARG @a logdomain was NULL.
127 * @retval SR_ERR @a logdomain was truncated.
131 SR_API int sr_log_logdomain_set(const char *logdomain)
136 sr_err("%s: logdomain was NULL", __func__);
140 len = g_strlcpy(sr_log_domain, logdomain, sizeof sr_log_domain);
142 sr_dbg("Log domain set to '%s'.", sr_log_domain);
144 return (len < sizeof sr_log_domain) ? SR_OK : SR_ERR;
148 * Get the currently configured libsigrok logdomain.
150 * @return A copy of the currently configured libsigrok logdomain
151 * string. The caller is responsible for g_free()ing the string when
152 * it is no longer needed.
156 SR_API char *sr_log_logdomain_get(void)
158 return g_strdup(sr_log_domain);
162 * Set the libsigrok log callback to the specified function.
164 * @param cb Function pointer to the log callback function to use.
166 * @param cb_data Pointer to private data to be passed on. This can be used by
167 * the caller to pass arbitrary data to the log functions. This
168 * pointer is only stored or passed on by libsigrok, and is
169 * never used or interpreted in any way. The pointer is allowed
170 * to be NULL if the caller doesn't need/want to pass any data.
172 * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments.
176 SR_API int sr_log_callback_set(sr_log_callback cb, void *cb_data)
179 sr_err("%s: cb was NULL", __func__);
183 /* Note: 'cb_data' is allowed to be NULL. */
186 sr_log_cb_data = cb_data;
192 * Set the libsigrok log callback to the default built-in one.
194 * Additionally, the internal 'sr_log_cb_data' pointer is set to NULL.
196 * @return SR_OK upon success, a negative error code otherwise.
200 SR_API int sr_log_callback_set_default(void)
203 * Note: No log output in this function, as it should safely work
204 * even if the currently set log callback is buggy/broken.
207 sr_log_cb_data = NULL;
212 static int sr_logv(void *cb_data, int loglevel, const char *format, va_list args)
219 /* This specific log callback doesn't need the void pointer data. */
222 /* Only output messages of at least the selected loglevel(s). */
223 if (loglevel > cur_loglevel)
226 if (cur_loglevel >= SR_LOG_SPEW) {
227 elapsed = g_get_monotonic_time() - sr_log_start_time;
228 min = elapsed / G_TIME_SPAN_MINUTE;
229 sec = (elapsed % G_TIME_SPAN_MINUTE) / G_TIME_SPAN_SECOND;
230 usec = elapsed % G_TIME_SPAN_SECOND;
232 if (fprintf(stderr, "[%.2" PRIi64 ":%.2d.%.6d] ", min, sec, usec) < 0)
235 if (sr_log_domain[0] != '\0' && fputs(sr_log_domain, stderr) < 0)
237 if (vfprintf(stderr, format, args) < 0)
239 if (putc('\n', stderr) < 0)
246 SR_PRIV int sr_log(int loglevel, const char *format, ...)
251 va_start(args, format);
252 ret = sr_log_cb(sr_log_cb_data, loglevel, format, args);