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 #include <stdlib.h>
   8
   9
  10 static volatile int handler_called;
  11
  12 static void
  13 handler (int sig)
  14 {
  15   handler_called = 1;
  16 }
  17
  18
  19 static int
  20 do_test (void)
  21 {
  22   struct sigaction sa;
  23   sa.sa_handler = handler;
  24   sa.sa_flags = 0;
  25   sigemptyset (&sa.sa_mask);
  26
  27   if (sigaction (SIGUSR1, &sa, NULL) != 0)
  28     {
  29       puts ("sigaction failed");
  30       return 1;
  31     }
  32
  33   sa.sa_handler = SIG_IGN;
  34   sa.sa_flags = SA_NOCLDWAIT;
  35
  36   if (sigaction (SIGCHLD, &sa, NULL) != 0)
  37     {
  38       puts ("2nd sigaction failed");
  39       return 1;
  40     }
  41
  42   sigset_t ss_usr1;
  43   sigemptyset (&ss_usr1);
  44   sigaddset (&ss_usr1, SIGUSR1);
  45   if (sigprocmask (SIG_BLOCK, &ss_usr1, NULL) != 0)
  46     {
  47       puts ("sigprocmask failed");
  48       return 1;
  49     }
  50
  51   int fds[2][2];
  52
  53   if (pipe (fds[0]) != 0 || pipe (fds[1]) != 0)
  54     {
  55       puts ("pipe failed");
  56       return 1;
  57     }
  58
  59   fd_set rfds;
  60   FD_ZERO (&rfds);
  61
  62   sigset_t ss;
  63   sigprocmask (SIG_SETMASK, NULL, &ss);
  64   sigdelset (&ss, SIGUSR1);
  65
  66   struct timespec to = { .tv_sec = 0, .tv_nsec = 500000000 };
  67
  68   pid_t parent = getpid ();
  69   pid_t p = fork ();
  70   if (p == 0)
  71     {
  72       close (fds[0][1]);
  73       close (fds[1][0]);
  74
  75       FD_SET (fds[0][0], &rfds);
  76
  77       int e;
  78       do
  79         {
  80           if (getppid () != parent)
  81             exit (2);
  82
  83           errno = 0;
  84           e = pselect (fds[0][0] + 1, &rfds, NULL, NULL, &to, &ss);
  85         }
  86       while (e == 0);
  87
  88       if (e != -1)
  89         {
  90           puts ("child: pselect did not fail");
  91           return 0;
  92         }
  93       if (errno != EINTR)
  94         {
  95           puts ("child: pselect did not set errno to EINTR");
  96           return 0;
  97         }
  98
  99       TEMP_FAILURE_RETRY (write (fds[1][1], "foo", 3));
 100
 101       exit (0);
 102     }
 103
 104   close (fds[0][0]);
 105   close (fds[1][1]);
 106
 107   FD_SET (fds[1][0], &rfds);
 108
 109   kill (p, SIGUSR1);
 110
 111   int e = pselect (fds[1][0] + 1, &rfds, NULL, NULL, NULL, &ss);
 112   if (e == -1)
 113     {
 114       puts ("parent: pselect failed");
 115       return 1;
 116     }
 117   if (e != 1)
 118     {
 119       puts ("parent: pselect did not report readable fd");
 120       return 1;
 121     }
 122   if (!FD_ISSET (fds[1][0], &rfds))
 123     {
 124       puts ("parent: pselect reports wrong fd");
 125       return 1;
 126     }
 127
 128   return 0;
 129 }
 130
 131 #define TEST_FUNCTION do_test ()
 132 #include "../test-skeleton.c"