misc/tst-pselect.c

   1 #include <errno.h>
   2 #include <signal.h>
   3 #include <stdio.h>
   4 #include <unistd.h>
   5 #include <sys/select.h>
   6 #include <sys/wait.h>
   7
   8
   9 static volatile int handler_called;
  10
  11 static void
  12 handler (int sig)
  13 {
  14   handler_called = 1;
  15 }
  16
  17
  18 static int
  19 do_test (void)
  20 {
  21   struct sigaction sa;
  22   sa.sa_handler = handler;
  23   sa.sa_flags = 0;
  24   sigemptyset (&sa.sa_mask);
  25
  26   if (sigaction (SIGUSR1, &sa, NULL) != 0)
  27     {
  28       puts ("sigaction failed");
  29       return 1;
  30     }
  31
  32   sa.sa_handler = SIG_IGN;
  33   sa.sa_flags = SA_NOCLDWAIT;
  34
  35   if (sigaction (SIGCHLD, &sa, NULL) != 0)
  36     {
  37       puts ("2nd sigaction failed");
  38       return 1;
  39     }
  40
  41   if (sigblock (sigmask (SIGUSR1)) != 0)
  42     {
  43       puts ("sigblock failed");
  44       return 1;
  45     }
  46
  47   int fds[2][2];
  48
  49   if (pipe (fds[0]) != 0 || pipe (fds[1]) != 0)
  50     {
  51       puts ("pipe failed");
  52       return 1;
  53     }
  54
  55   fd_set rfds;
  56   FD_ZERO (&rfds);
  57
  58   sigset_t ss;
  59   sigprocmask (SIG_SETMASK, NULL, &ss);
  60   sigdelset (&ss, SIGUSR1);
  61
  62   struct timespec to = { .tv_sec = 0, .tv_nsec = 500000000 };
  63
  64   pid_t parent = getpid ();
  65   pid_t p = fork ();
  66   if (p == 0)
  67     {
  68       close (fds[0][1]);
  69       close (fds[1][0]);
  70
  71       FD_SET (fds[0][0], &rfds);
  72
  73       int e;
  74       do
  75         {
  76           if (getppid () != parent)
  77             exit (2);
  78
  79           errno = 0;
  80           e = pselect (fds[0][0] + 1, &rfds, NULL, NULL, &to, &ss);
  81         }
  82       while (e == 0);
  83
  84       if (e != -1)
  85         {
  86           puts ("child: pselect did not fail");
  87           return 0;
  88         }
  89       if (errno != EINTR)
  90         {
  91           puts ("child: pselect did not set errno to EINTR");
  92           return 0;
  93         }
  94
  95       TEMP_FAILURE_RETRY (write (fds[1][1], "foo", 3));
  96
  97       exit (0);
  98     }
  99
 100   close (fds[0][0]);
 101   close (fds[1][1]);
 102
 103   FD_SET (fds[1][0], &rfds);
 104
 105   kill (p, SIGUSR1);
 106
 107   int e = pselect (fds[1][0] + 1, &rfds, NULL, NULL, NULL, &ss);
 108   if (e == -1)
 109     {
 110       puts ("parent: pselect failed");
 111       return 1;
 112     }
 113   if (e != 1)
 114     {
 115       puts ("parent: pselect did not report readable fd");
 116       return 1;
 117     }
 118   if (!FD_ISSET (fds[1][0], &rfds))
 119     {
 120       puts ("parent: pselect reports wrong fd");
 121       return 1;
 122     }
 123
 124   return 0;
 125 }
 126
 127 #define TEST_FUNCTION do_test ()
 128 #include "../test-skeleton.c"