signal/tst-sigset2.c

   1 /* sigset_SIG_HOLD_bug.c [BZ #1951] */
   2 #include <errno.h>
   3 #include <error.h>
   4 #include <inttypes.h>
   5 #include <signal.h>
   6 #include <stdio.h>
   7 #include <stdlib.h>
   8 #include <string.h>
   9 #include <unistd.h>
  10 #include <sys/types.h>
  11 #include <sys/wait.h>
  12 #include <libc-diag.h>
  13
  14 /* The sigset function is deprecated.  */
  15 DIAG_IGNORE_NEEDS_COMMENT (4.9, "-Wdeprecated-declarations");
  16
  17 #define TEST_SIG SIGINT
  18
  19
  20 /* Print mask of blocked signals for this process */
  21 static void
  22 printSigMask (const char *msg)
  23 {
  24   sigset_t currMask;
  25   int sig;
  26   int cnt;
  27
  28   if (msg != NULL)
  29     printf ("%s", msg);
  30
  31   if (sigprocmask (SIG_BLOCK, NULL, &currMask) == -1)
  32     error (1, errno, "sigaction");
  33
  34   cnt = 0;
  35   for (sig = 1; sig < NSIG; sig++)
  36     {
  37       if (sigismember (&currMask, sig))
  38         {
  39           cnt++;
  40           printf ("\t\t%d (%s)\n", sig, strsignal (sig));
  41         }
  42     }
  43
  44   if (cnt == 0)
  45     printf ("\t\t<empty signal set>\n");
  46 } /* printSigMask */
  47
  48 static void
  49 handler (int sig)
  50 {
  51   printf ("Caught signal %d\n", sig);
  52   printSigMask ("Signal mask in handler\n");
  53   printf ("Handler returning\n");
  54   _exit (1);
  55 } /* handler */
  56
  57 static void
  58 printDisposition (sighandler_t disp)
  59 {
  60   if (disp == SIG_HOLD)
  61     printf ("SIG_HOLD");
  62   else if (disp == SIG_DFL)
  63     printf ("SIG_DFL");
  64   else if (disp == SIG_IGN)
  65     printf ("SIG_IGN");
  66   else
  67     printf ("handled at %" PRIxPTR, (uintptr_t) disp);
  68 } /* printDisposition */
  69
  70 static int
  71 returnTest1 (void)
  72 {
  73   sighandler_t prev;
  74
  75   printf ("===== TEST 1 =====\n");
  76   printf ("Blocking signal with sighold()\n");
  77   if (sighold (TEST_SIG) == -1)
  78     error (1, errno, "sighold");
  79   printSigMask ("Signal mask after sighold()\n");
  80
  81   printf ("About to use sigset() to establish handler\n");
  82   prev = sigset (TEST_SIG, handler);
  83   if (prev == SIG_ERR)
  84     error(1, errno, "sigset");
  85
  86   printf ("Previous disposition: ");
  87   printDisposition (prev);
  88   printf (" (should be SIG_HOLD)\n");
  89   if (prev != SIG_HOLD)
  90     {
  91       printf("TEST FAILED!!!\n");
  92       return 1;
  93     }
  94   return 0;
  95 } /* returnTest1 */
  96
  97 static int
  98 returnTest2 (void)
  99 {
 100   sighandler_t prev;
 101
 102   printf ("\n===== TEST 2 =====\n");
 103
 104   printf ("About to use sigset() to set SIG_HOLD\n");
 105   prev = sigset (TEST_SIG, SIG_HOLD);
 106   if (prev == SIG_ERR)
 107     error (1, errno, "sigset");
 108
 109   printf ("Previous disposition: ");
 110   printDisposition (prev);
 111   printf (" (should be SIG_DFL)\n");
 112   if (prev != SIG_DFL)
 113     {
 114       printf("TEST FAILED!!!\n");
 115       return 1;
 116     }
 117   return 0;
 118 } /* returnTest2 */
 119
 120 static int
 121 returnTest3 (void)
 122 {
 123   sighandler_t prev;
 124
 125   printf ("\n===== TEST 3 =====\n");
 126
 127   printf ("About to use sigset() to set SIG_HOLD\n");
 128   prev = sigset (TEST_SIG, SIG_HOLD);
 129   if (prev == SIG_ERR)
 130     error (1, errno, "sigset");
 131
 132   printf ("About to use sigset() to set SIG_HOLD (again)\n");
 133   prev = sigset (TEST_SIG, SIG_HOLD);
 134   if (prev == SIG_ERR)
 135     error (1, errno, "sigset");
 136
 137   printf ("Previous disposition: ");
 138   printDisposition (prev);
 139   printf (" (should be SIG_HOLD)\n");
 140   if (prev != SIG_HOLD)
 141     {
 142       printf("TEST FAILED!!!\n");
 143       return 1;
 144     }
 145   return 0;
 146 } /* returnTest3 */
 147
 148 int
 149 main (int argc, char *argv[])
 150 {
 151   pid_t childPid;
 152
 153   childPid = fork();
 154   if (childPid == -1)
 155     error (1, errno, "fork");
 156
 157   if (childPid == 0)
 158     exit (returnTest1 ());
 159
 160   int status;
 161   if (TEMP_FAILURE_RETRY (waitpid (childPid, &status, 0)) != childPid)
 162     error (1, errno, "waitpid");
 163   int result = !WIFEXITED (status) || WEXITSTATUS (status) != 0;
 164
 165   childPid = fork();
 166   if (childPid == -1)
 167     error (1, errno, "fork");
 168
 169   if (childPid == 0)
 170     exit (returnTest2 ());
 171
 172   if (TEMP_FAILURE_RETRY (waitpid (childPid, &status, 0)) != childPid)
 173     error (1, errno, "waitpid");
 174   result |= !WIFEXITED (status) || WEXITSTATUS (status) != 0;
 175
 176   childPid = fork();
 177   if (childPid == -1)
 178     error (1, errno, "fork");
 179
 180   if (childPid == 0)
 181     exit (returnTest3 ());
 182
 183   if (TEMP_FAILURE_RETRY (waitpid (childPid, &status, 0)) != childPid)
 184     error (1, errno, "waitpid");
 185   result |= !WIFEXITED (status) || WEXITSTATUS (status) != 0;
 186
 187   return result;
 188 } /* main */