posix/tst-vfork2.c

   1 /* Test for vfork functions.
   2    Copyright (C) 2004 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@redhat.com>, 2004.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include <errno.h>
  22 #include <signal.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <time.h>
  27 #include <unistd.h>
  28 #include <sys/time.h>
  29 #include <sys/types.h>
  30 #include <sys/wait.h>
  31
  32 int raise_fail;
  33
  34 static void
  35 alrm (int sig)
  36 {
  37   if (raise (SIGUSR1) < 0)
  38     raise_fail = 1;
  39 }
  40
  41 /* This test relies on non-POSIX functionality since the child
  42    processes call write, nanosleep and getpid.  */
  43 static int
  44 do_test (void)
  45 {
  46   int result = 0;
  47   int fd[2];
  48
  49   signal (SIGUSR1, SIG_IGN);
  50
  51   struct sigaction sa;
  52   sa.sa_handler = alrm;
  53   sigemptyset (&sa.sa_mask);
  54   sa.sa_flags = 0;
  55   if (sigaction (SIGALRM, &sa, NULL) < 0)
  56     {
  57       puts ("couldn't set up SIGALRM handler");
  58       return 1;
  59     }
  60
  61   if (pipe (fd) == -1)
  62     {
  63       puts ("pipe failed");
  64       return 1;
  65     }
  66
  67   struct itimerval it;
  68   it.it_value.tv_sec = 0;
  69   it.it_value.tv_usec = 200 * 1000;
  70   it.it_interval = it.it_value;
  71   if (setitimer (ITIMER_REAL, &it, NULL) < 0)
  72     {
  73       puts ("couldn't set up timer");
  74       return 1;
  75     }
  76
  77   /* First vfork() without previous getpid().  */
  78   pid_t p1;
  79   if ((p1 = vfork ()) == 0)
  80     {
  81       pid_t p = getpid ();
  82
  83       struct timespec ts;
  84       ts.tv_sec = 1;
  85       ts.tv_nsec = 0;
  86       TEMP_FAILURE_RETRY (nanosleep (&ts, &ts));
  87       _exit (TEMP_FAILURE_RETRY (write (fd[1], &p, sizeof (p))) != sizeof (p));
  88     }
  89   else if (p1 == -1)
  90     {
  91       puts ("1st vfork failed");
  92       result = 1;
  93     }
  94
  95   memset (&it, 0, sizeof (it));
  96   setitimer (ITIMER_REAL, &it, NULL);
  97
  98   pid_t p2 = 0;
  99   if (TEMP_FAILURE_RETRY (read (fd[0], &p2, sizeof (pid_t))) != sizeof (pid_t))
 100     {
 101       puts ("1st read failed");
 102       result = 1;
 103     }
 104   int r;
 105   if (TEMP_FAILURE_RETRY (waitpid (p1, &r, 0)) != p1)
 106     {
 107       puts ("1st waitpid failed");
 108       result = 1;
 109     }
 110   else if (r != 0)
 111     {
 112       puts ("write in 1st child failed");
 113       result = 1;
 114     }
 115
 116   /* Main process' ID.  */
 117   pid_t p0 = getpid ();
 118
 119   /* vfork() again, but after a getpid() in the main process.  */
 120   pid_t p3;
 121   if ((p3 = vfork ()) == 0)
 122     {
 123       pid_t p = getpid ();
 124       _exit (TEMP_FAILURE_RETRY (write (fd[1], &p, sizeof (p))) != sizeof (p));
 125     }
 126   else if (p1 == -1)
 127     {
 128       puts ("2nd vfork failed");
 129       result = 1;
 130     }
 131
 132   pid_t p4;
 133   if (TEMP_FAILURE_RETRY (read (fd[0], &p4, sizeof (pid_t))) != sizeof (pid_t))
 134     {
 135       puts ("2nd read failed");
 136       result = 1;
 137     }
 138   if (TEMP_FAILURE_RETRY (waitpid (p3, &r, 0)) != p3)
 139     {
 140       puts ("2nd waitpid failed");
 141       result = 1;
 142     }
 143   else if (r != 0)
 144     {
 145       puts ("write in 2nd child failed");
 146       result = 1;
 147     }
 148
 149   /* And getpid in the main process again.  */
 150   pid_t p5 = getpid ();
 151
 152   /* Analysis of the results.  */
 153   if (p0 != p5)
 154     {
 155       printf ("p0(%ld) != p5(%ld)\n", (long int) p0, (long int) p5);
 156       result = 1;
 157     }
 158
 159   if (p0 == p1)
 160     {
 161       printf ("p0(%ld) == p1(%ld)\n", (long int) p0, (long int) p1);
 162       result = 1;
 163     }
 164
 165   if (p1 != p2)
 166     {
 167       printf ("p1(%ld) != p2(%ld)\n", (long int) p1, (long int) p2);
 168       result = 1;
 169     }
 170
 171   if (p0 == p3)
 172     {
 173       printf ("p0(%ld) == p3(%ld)\n", (long int) p0, (long int) p3);
 174       result = 1;
 175     }
 176
 177   if (p3 != p4)
 178     {
 179       printf ("p3(%ld) != p4(%ld)\n", (long int) p3, (long int) p4);
 180       result = 1;
 181     }
 182
 183   close (fd[0]);
 184   close (fd[1]);
 185
 186   if (raise_fail)
 187     {
 188       puts ("raise failed");
 189       result = 1;
 190     }
 191
 192   if (result == 0)
 193     puts ("All OK");
 194
 195   return result;
 196 }
 197
 198 #define TEST_FUNCTION do_test ()
 199 #include "../test-skeleton.c"