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 jmp_buf rec;
  15 char buf[160];
  16
  17 static void
  18 sigabrt (int unused)
  19 {
  20   longjmp (rec, 1);  /* recover control */
  21 }
  22
  23 #undef NDEBUG
  24 #include <assert.h>
  25 static void
  26 assert1 (void)
  27 {
  28   assert_perror (1);
  29 }
  30
  31 static void
  32 assert2 (void)
  33 {
  34   assert_perror (0);
  35 }
  36
  37 #define NDEBUG
  38 #include <assert.h>
  39 static void
  40 assert3 (void)
  41 {
  42   assert_perror (2);
  43 }
  44
  45 int
  46 main(void)
  47 {
  48   volatile int failed = 1;  /* safety in presence of longjmp() */
  49
  50   fclose (stderr);
  51   stderr = tmpfile ();
  52   if (!stderr)
  53     abort ();
  54
  55   signal (SIGABRT, sigabrt);
  56
  57   if (!setjmp (rec))
  58     assert1 ();
  59   else
  60     failed = 0;  /* should happen */
  61
  62   if (!setjmp (rec))
  63     assert2 ();
  64   else
  65     failed = 1; /* should not happen */
  66
  67   if (!setjmp (rec))
  68     assert3 ();
  69   else
  70     failed = 1; /* should not happen */
  71
  72   rewind (stderr);
  73   fgets (buf, 160, stderr);
  74   if (!strstr(buf, strerror (1)))
  75     failed = 1;
  76
  77   fgets (buf, 160, stderr);
  78   if (strstr (buf, strerror (0)))
  79     failed = 1;
  80
  81   fgets (buf, 160, stderr);
  82   if (strstr (buf, strerror (2)))
  83     failed = 1;
  84
  85   return failed;
  86 }