87 lines
1.3 KiB
C
87 lines
1.3 KiB
C
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#include <errno.h>
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#include <fcntl.h>
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#include <paths.h>
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#include <setjmp.h>
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#include <signal.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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static jmp_buf b;
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static void
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__attribute__ ((noinline))
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f (void)
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{
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char buf[1000];
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asm volatile ("" : "=m" (buf));
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if (setjmp (b) != 0)
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{
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puts ("second longjmp succeeded");
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exit (1);
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}
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}
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static bool expected_to_fail;
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static void
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handler (int sig)
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{
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if (expected_to_fail)
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_exit (0);
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else
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{
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static const char msg[] = "unexpected longjmp failure\n";
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TEMP_FAILURE_RETRY (write (STDOUT_FILENO, msg, sizeof (msg) - 1));
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_exit (1);
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}
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}
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int
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main (void)
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{
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struct sigaction sa;
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sa.sa_handler = handler;
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sa.sa_flags = 0;
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sigemptyset (&sa.sa_mask);
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sigaction (SIGABRT, &sa, NULL);
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/* Avoid all the buffer overflow messages on stderr. */
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int fd = open (_PATH_DEVNULL, O_WRONLY);
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if (fd == -1)
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close (STDERR_FILENO);
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else
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{
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dup2 (fd, STDERR_FILENO);
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close (fd);
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}
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setenv ("LIBC_FATAL_STDERR_", "1", 1);
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expected_to_fail = false;
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if (setjmp (b) == 0)
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{
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longjmp (b, 1);
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/* NOTREACHED */
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printf ("first longjmp returned\n");
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return 1;
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}
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expected_to_fail = true;
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f ();
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longjmp (b, 1);
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puts ("second longjmp returned");
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return 1;
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}
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