assert/test-assert-perr.c

   1 /* Test assert_perror().
   2  *
   3  * This is hairier than you'd think, involving games with
   4  * stdio and signals.
   5  *
   6  */
   7
   8 #include <signal.h>
   9 #include <stdlib.h>
  10 #include <stdio.h>
  11 #include <string.h>
  12 #include <setjmp.h>
  13
  14 #include <support/xstdio.h>
  15
  16 jmp_buf rec;
  17 char buf[160];
  18
  19 static void
  20 sigabrt (int unused)
  21 {
  22   longjmp (rec, 1);  /* recover control */
  23 }
  24
  25 #undef NDEBUG
  26 #include <assert.h>
  27 static void
  28 assert1 (void)
  29 {
  30   assert_perror (1);
  31 }
  32
  33 static void
  34 assert2 (void)
  35 {
  36   assert_perror (0);
  37 }
  38
  39 #define NDEBUG
  40 #include <assert.h>
  41 static void
  42 assert3 (void)
  43 {
  44   assert_perror (2);
  45 }
  46
  47 int
  48 main(void)
  49 {
  50   volatile int failed = 1;  /* safety in presence of longjmp() */
  51
  52   fclose (stderr);
  53   stderr = tmpfile ();
  54   if (!stderr)
  55     abort ();
  56
  57   signal (SIGABRT, sigabrt);
  58
  59   if (!setjmp (rec))
  60     assert1 ();
  61   else
  62     failed = 0;  /* should happen */
  63
  64   if (!setjmp (rec))
  65     assert2 ();
  66   else
  67     failed = 1; /* should not happen */
  68
  69   if (!setjmp (rec))
  70     assert3 ();
  71   else
  72     failed = 1; /* should not happen */
  73
  74   rewind (stderr);
  75   xfgets (buf, 160, stderr);
  76   if (!strstr(buf, strerror (1)))
  77     failed = 1;
  78
  79   xfgets (buf, 160, stderr);
  80   if (strstr (buf, strerror (0)))
  81     failed = 1;
  82
  83   xfgets (buf, 160, stderr);
  84   if (strstr (buf, strerror (2)))
  85     failed = 1;
  86
  87   return failed;
  88 }