92 lines
2.4 KiB
C
92 lines
2.4 KiB
C
#include <errno.h>
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#include <signal.h>
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#include "test.h"
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#include "usctest.h"
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const char *TCID = "checksignal"; /* Test program identifier. */
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int TST_TOTAL = 3; /* Total number of test cases. */
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extern int Tst_count; /* Test Case counter for tst_* routines */
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void
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sig_handler (int signo)
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{
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errno = EINVAL;
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}
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int
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main ()
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{
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int n, ret;
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int fds[2];
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char buf[10];
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struct sigaction act;
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int i;
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Tst_count = 0;
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/* Reset SA_RESTART flag. */
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while ((ret = sigaction (SIGALRM, NULL, &act)) == EINTR)
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;
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if (ret)
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tst_brk (TBROK, NULL, NULL, "Get signal action structure");
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act.sa_flags &= ~SA_RESTART;
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while ((ret = sigaction (SIGALRM, &act, NULL)) == EINTR)
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;
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if (ret)
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tst_brk (TBROK, NULL, NULL, "Reset SA_RESTART");
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for (i = 0; i < 2; i++)
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{
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if (pipe (fds) < 0)
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tst_brk (TBROK, NULL, NULL, "Create pipe");
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/* Set signal handler using signal(2) call... */
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if (signal (SIGALRM, sig_handler) < 0)
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tst_brk (TBROK, NULL, NULL, "Call signal() to install signal handler");
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/* ...and check if signal(2) sets SA_RESTART again. */
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while ((ret = sigaction (SIGALRM, NULL, &act)) == EINTR)
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;
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if (ret)
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tst_brk (TBROK, NULL, NULL, "Get signal action structure");
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tst_resm (act.sa_flags & SA_RESTART ? TPASS : TFAIL,
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"signal() sets SA_RESTART");
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const char *msg1, *msg2;
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if (i == 1)
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{
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siginterrupt (SIGALRM, 1);
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msg1 = "Reset SA_RESTART via siginterrupt";
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msg2 = "Set EINTR on interrupted read() call via siginterrupt";
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}
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else
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{
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/* Reset SA_RESTART flag again. */
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act.sa_handler = sig_handler;
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act.sa_flags &= ~SA_RESTART;
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while ((ret = sigaction (SIGALRM, &act, NULL)) == EINTR)
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;
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msg1 = "Reset SA_RESTART via sigaction";
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msg2 = "Set EINTR on interrupted read() call via sigaction";
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}
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if (ret)
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tst_brk (TBROK, NULL, NULL, msg1);
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/* Start timer to force a SIGALRM. */
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alarm (1);
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/* Call read(2) to check if the EINTR errno is correctly preserved,
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even if the signal handler routine changes errno. */
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n = read(fds[0], buf, 10);
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tst_resm (n < 0 && errno == EINTR ? TPASS : TFAIL, msg2);
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close (fds[0]);
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close (fds[1]);
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}
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/* Check if another errno is correctly returned (here EBADF). */
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n = read(fds[0], buf, 10);
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tst_resm (n < 0 && errno == EBADF ? TPASS : TFAIL,
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"Set EBADF on closed file descriptor");
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tst_exit ();
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}
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