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145 lines
3.5 KiB
C
145 lines
3.5 KiB
C
/* Helper file for tst-{atexit,at_quick_exit,cxa_atexit,on_exit}.
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Copyright (C) 2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/wait.h>
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/* http://pubs.opengroup.org/onlinepubs/000095399/functions/atexit.html
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requires that we support at least 32 atexit handlers.
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The number we actually support is limited by memory. Here we simply
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check that we support at least the minimum required. */
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#define MAX_ATEXIT 32
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static char crumbs[MAX_ATEXIT];
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static int next_slot = 0;
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/* Helper: flush stdout and _exit. */
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static void
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_exit_with_flush (int code)
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{
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fflush (stdout);
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_exit (code);
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}
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static void
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fn0 (void)
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{
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crumbs[next_slot++] = '0';
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}
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static void
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fn1 (void)
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{
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crumbs[next_slot++] = '1';
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}
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static void
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fn2 (void)
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{
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crumbs[next_slot++] = '2';
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ATEXIT (fn1);
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}
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static void
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fn3 (void)
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{
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crumbs[next_slot++] = '3';
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ATEXIT (fn2);
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ATEXIT (fn0);
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}
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static void
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fn_final (void)
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{
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/* Arbitrary sequence matching current registrations. */
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const char expected[] = "00000000000000000000000003021121130211";
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if (strcmp (crumbs, expected) == 0)
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_exit_with_flush (0);
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printf ("crumbs: %s\n", crumbs);
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printf ("expected: %s\n", expected);
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_exit_with_flush (1);
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}
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static int
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do_test (void)
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{
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int slots_remaining = MAX_ATEXIT;
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/* Register this first so it can verify expected order of the rest. */
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ATEXIT (fn_final); --slots_remaining;
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ATEXIT (fn1); --slots_remaining;
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ATEXIT (fn3); --slots_remaining;
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ATEXIT (fn1); --slots_remaining;
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ATEXIT (fn2); --slots_remaining;
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ATEXIT (fn1); --slots_remaining;
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ATEXIT (fn3); --slots_remaining;
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/* Fill the rest of available slots with fn0. */
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while (slots_remaining > 0)
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{
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ATEXIT (fn0); --slots_remaining;
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}
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/* Verify that handlers registered above are inherited across fork. */
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const pid_t child = fork ();
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switch (child)
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{
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case -1:
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printf ("fork: %m\n");
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_exit_with_flush (3);
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case 0: /* Child. */
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break;
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default:
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{
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int status;
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const pid_t exited = waitpid (child, &status, 0);
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if (child != exited)
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{
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printf ("unexpected child: %d, expected %d\n", exited, child);
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_exit_with_flush (4);
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}
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if (status != 0)
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{
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if (WIFEXITED (status))
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printf ("unexpected exit status %d from child %d\n",
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WEXITSTATUS (status), child);
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else if (WIFSIGNALED (status))
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printf ("unexpected signal %d from child %d\n",
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WTERMSIG (status), child);
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else
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printf ("unexpected status %d from child %d\n", status, child);
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_exit_with_flush (5);
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}
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}
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break;
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}
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EXIT (2); /* If we see this exit code, fn_final must have not worked. */
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}
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#define TEST_FUNCTION do_test
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#include <support/test-driver.c>
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