server/log-stderr.c

   1 /* nbdkit
   2  * Copyright Red Hat
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are
   6  * met:
   7  *
   8  * * Redistributions of source code must retain the above copyright
   9  * notice, this list of conditions and the following disclaimer.
  10  *
  11  * * Redistributions in binary form must reproduce the above copyright
  12  * notice, this list of conditions and the following disclaimer in the
  13  * documentation and/or other materials provided with the distribution.
  14  *
  15  * * Neither the name of Red Hat nor the names of its contributors may be
  16  * used to endorse or promote products derived from this software without
  17  * specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  21  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
  22  * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
  23  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  26  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  27  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  28  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  29  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #include <config.h>
  34
  35 #include <stdio.h>
  36 #include <stdlib.h>
  37 #include <stdarg.h>
  38 #include <string.h>
  39 #include <unistd.h>
  40 #include <errno.h>
  41
  42 #include "ansi-colours.h"
  43
  44 #include "internal.h"
  45
  46 /* Note: preserves the previous value of errno. */
  47 void
  48 log_stderr_verror (const char *fs, va_list args)
  49 {
  50   int err = errno;              /* must be first line of function */
  51
  52   const char *name = threadlocal_get_name ();
  53   size_t instance_num = threadlocal_get_instance_num ();
  54   int tty;
  55
  56 #ifdef HAVE_FLOCKFILE
  57   flockfile (stderr);
  58 #endif
  59   tty = isatty (fileno (stderr));
  60   if (tty) ansi_force_colour (ANSI_FG_BRIGHT_RED, stderr);
  61
  62   fprintf (stderr, "%s: ", program_name);
  63
  64   if (name) {
  65     fprintf (stderr, "%s", name);
  66     if (instance_num > 0)
  67       fprintf (stderr, "[%zu]", instance_num);
  68     fprintf (stderr, ": ");
  69   }
  70
  71   fprintf (stderr, "error: ");
  72   errno = err;                  /* must restore in case fs contains %m */
  73   vfprintf (stderr, fs, args);
  74   fprintf (stderr, "\n");
  75
  76   if (tty) ansi_force_restore (stderr);
  77
  78 #ifdef HAVE_FUNLOCKFILE
  79   funlockfile (stderr);
  80 #endif
  81
  82   errno = err;                  /* must be last line of function */
  83 }