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102 lines
2.2 KiB
C
102 lines
2.2 KiB
C
/* Tests for fork in multi-threaded environment.
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Copyright (C) 2000 Free Software Foundation, Inc.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 2000.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <errno.h>
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#include <error.h>
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#include <stdlib.h>
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#include <pthread.h>
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#include <unistd.h>
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#include <wait.h>
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enum
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{
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PREPARE_BIT = 1,
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PARENT_BIT = 2,
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CHILD_BIT = 4
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};
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static int var;
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static void
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prepare (void)
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{
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var |= PREPARE_BIT;
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}
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static void
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parent (void)
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{
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var |= PARENT_BIT;
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}
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static void
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child (void)
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{
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var |= CHILD_BIT;
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}
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static void *thread (void *arg);
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int
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main (void)
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{
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pthread_t th;
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void *res;
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pthread_atfork (prepare, parent, child);
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if (pthread_create (&th, NULL, thread, NULL) != 0)
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error (EXIT_FAILURE, 0, "cannot create thread");
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pthread_join (th, &res);
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return (int) res;
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}
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static void *
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thread (void *arg)
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{
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int status;
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pid_t pid;
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pid = fork ();
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if (pid == 0)
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{
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/* We check whether the `prepare' and `child' function ran. */
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exit (var != (PREPARE_BIT | CHILD_BIT));
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}
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else if (pid == (pid_t) -1)
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error (EXIT_FAILURE, errno, "cannot fork");
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if (waitpid (pid, &status, 0) != pid)
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error (EXIT_FAILURE, errno, "wrong child");
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if (WTERMSIG (status) != 0)
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error (EXIT_FAILURE, 0, "Child terminated incorrectly");
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status = WEXITSTATUS (status);
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if (status == 0)
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status = var != (PREPARE_BIT | PARENT_BIT);
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return (void *) status;
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}
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