liblttng-ust/tracef.c

   1 /*
   2  * Copyright (C) 2013-2014  Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a copy
   5  * of this software and associated documentation files (the "Software"), to deal
   6  * in the Software without restriction, including without limitation the rights
   7  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   8  * copies of the Software, and to permit persons to whom the Software is
   9  * furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  17  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  18  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  19  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  20  * SOFTWARE.
  21  */
  22
  23 #define _GNU_SOURCE
  24 #define _LGPL_SOURCE
  25 #include <stdio.h>
  26 #include <helper.h>
  27
  28 #define TRACEPOINT_CREATE_PROBES
  29 #define TRACEPOINT_DEFINE
  30 #include "lttng-ust-tracef-provider.h"
  31
  32 static inline __attribute__((always_inline))
  33 void __lttng_ust_vtracef(const char *fmt, va_list ap)
  34 {
  35         char *msg;
  36         const int len = vasprintf(&msg, fmt, ap);
  37
  38         /* len does not include the final \0 */
  39         if (len < 0)
  40                 goto end;
  41         __tracepoint_cb_lttng_ust_tracef___event(msg, len,
  42                 LTTNG_UST_CALLER_IP());
  43         free(msg);
  44 end:
  45         return;
  46 }
  47
  48 void _lttng_ust_vtracef(const char *fmt, va_list ap)
  49 {
  50         __lttng_ust_vtracef(fmt, ap);
  51 }
  52
  53 void _lttng_ust_tracef(const char *fmt, ...)
  54 {
  55         va_list ap;
  56
  57         va_start(ap, fmt);
  58         __lttng_ust_vtracef(fmt, ap);
  59         va_end(ap);
  60 }