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