302 lines
7.3 KiB
C
302 lines
7.3 KiB
C
/* This is a reproducer for BZ#970854.
|
|
* https://bugzilla.redhat.com/show_bug.cgi?id=970854
|
|
*/
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <unistd.h>
|
|
#include <sys/types.h>
|
|
#include <fcntl.h>
|
|
#include <errno.h>
|
|
#include <signal.h>
|
|
#include <sys/wait.h>
|
|
|
|
/* Signal number of caught signal. */
|
|
int caught_sig;
|
|
/* Pipe used to simulate the EINTR return. */
|
|
int pfd[2];
|
|
/* General purpose buffer. */
|
|
#define BLK_SIZE 512
|
|
char buf[BLK_SIZE];
|
|
/* Alarm counter. */
|
|
int alrm_flag = 0;
|
|
|
|
#define SPEEDFACTOR (3)
|
|
#define WAITTIME (5*SPEEDFACTOR)
|
|
#define NSIG 32
|
|
|
|
/* Enable or disable debug printf. */
|
|
#define DPRINTF(...) printf(__VA_ARGS__)
|
|
// #define DPRINTF(...) do {} while (0)
|
|
|
|
/* Signal function to check timeouts. */
|
|
void
|
|
alrm (int signal)
|
|
{
|
|
++alrm_flag;
|
|
}
|
|
|
|
#define NULLSA ((struct sigaction *)0)
|
|
|
|
/* Timeout function. */
|
|
#define SET_TIMEOUT(waittime) \
|
|
{ \
|
|
unsigned to_unslept, to_alrm, to_time; \
|
|
int to_err, to_flag, to_ret; \
|
|
struct sigaction to_alrm_sa, to_old_sa; \
|
|
to_time = (waittime); \
|
|
to_flag = 0; \
|
|
alrm_flag = 0; \
|
|
to_alrm_sa.sa_handler = alrm; \
|
|
to_alrm_sa.sa_flags = 0; \
|
|
(void) sigemptyset(&to_alrm_sa.sa_mask); \
|
|
to_alrm = alarm(0); \
|
|
to_ret = sigaction(SIGALRM, &to_alrm_sa, &to_old_sa); \
|
|
if (to_ret != 0) \
|
|
DPRINTF("SET_TIMEOUT: sigaction(SIGALRM, ...) failed"); \
|
|
if (to_alrm != 0) { \
|
|
if (to_time < to_alrm) { \
|
|
++to_flag; \
|
|
to_alrm -= to_time; \
|
|
} else { \
|
|
--to_flag; \
|
|
to_time = to_alrm; \
|
|
to_alrm = 0; \
|
|
(void) sigaction(SIGALRM, &to_old_sa, NULLSA); \
|
|
} \
|
|
} \
|
|
(void) alarm(to_time);
|
|
|
|
|
|
#define CLEAR_ALARM \
|
|
to_err = errno; \
|
|
to_unslept = alarm(0); \
|
|
if (to_flag >= 0) \
|
|
(void) sigaction(SIGALRM, &to_old_sa, NULLSA); \
|
|
if (to_flag > 0 || (to_flag < 0 && to_unslept != 0)) \
|
|
(void) alarm(to_alrm + to_unslept); \
|
|
errno = to_err; \
|
|
}
|
|
|
|
|
|
void
|
|
sig_catch (int signal)
|
|
{
|
|
caught_sig = signal;
|
|
}
|
|
|
|
int
|
|
main (void)
|
|
{
|
|
int ret;
|
|
pid_t child;
|
|
struct sigaction act;
|
|
int fd, flags;
|
|
int written, count;
|
|
FILE *fp;
|
|
|
|
act.sa_handler = sig_catch;
|
|
act.sa_flags = 0;
|
|
sigemptyset (&act.sa_mask);
|
|
|
|
/* Create a pipe for using with a child process that will write to
|
|
the pipe via fputs. */
|
|
ret = pipe (pfd);
|
|
if (ret != 0)
|
|
{
|
|
perror ("pipe");
|
|
exit (1);
|
|
}
|
|
|
|
/* Work with the write side of the pipe. */
|
|
fd = pfd[1];
|
|
|
|
/* Set the pipe into non-blocking mode.
|
|
We do this to fill up the pipe without blocking. */
|
|
flags = fcntl (fd, F_GETFL);
|
|
if (flags == -1)
|
|
{
|
|
perror ("fcntl (F_GETFL)");
|
|
exit (1);
|
|
}
|
|
flags |= O_NONBLOCK;
|
|
ret = fcntl (fd, F_SETFL, flags);
|
|
if (ret == -1)
|
|
{
|
|
perror ("fcntl (F_SETFL)");
|
|
exit (1);
|
|
}
|
|
/* Fill the write side of the pipe. */
|
|
/* Fill BLK_SIZE at a time... */
|
|
do
|
|
{
|
|
written = write (fd, buf, BLK_SIZE);
|
|
if (written == -1)
|
|
{
|
|
DPRINTF ("write (BLK_SIZE), written = %d, errno = %d\n", written, errno);
|
|
}
|
|
else
|
|
count += written;
|
|
}
|
|
while (written > 0);
|
|
/* Fill the remainder char at a time... */
|
|
do
|
|
{
|
|
written = write (fd, "z", 1);
|
|
if (written == -1)
|
|
{
|
|
DPRINTF ("write (z), errno = %d\n", errno);
|
|
}
|
|
else
|
|
count += written;
|
|
}
|
|
while (written > 0);
|
|
DPRINTF ("Wrote %d bytes to write side of pipe.\n", count);
|
|
/* Set pipe to blocking now. */
|
|
flags = fcntl (fd, F_GETFL);
|
|
if (flags == -1)
|
|
{
|
|
perror ("fcntl (F_GETFL)");
|
|
exit (1);
|
|
}
|
|
flags &= ~O_NONBLOCK;
|
|
ret = fcntl (fd, F_SETFL, flags);
|
|
if (ret == -1)
|
|
{
|
|
perror ("fcntl (F_SETFL)");
|
|
exit (1);
|
|
}
|
|
/* Get a stream for child fputs. */
|
|
fp = fdopen (fd, "w");
|
|
if (fp == NULL)
|
|
{
|
|
perror ("fopen");
|
|
exit (1);
|
|
}
|
|
/* Unbuffer the stream... */
|
|
/* Original uses setbuf (fp, (char *) NULL); */
|
|
ret = setvbuf (fp, (char *) NULL, _IONBF, 0);
|
|
if (ret != 0)
|
|
{
|
|
perror ("setvbuf");
|
|
exit (1);
|
|
}
|
|
/* Start the alarm counting... */
|
|
SET_TIMEOUT (2 * WAITTIME)
|
|
child = fork ();
|
|
|
|
|
|
if (child == 0)
|
|
{
|
|
pid_t selfid __attribute__ ((__unused__));
|
|
int i;
|
|
/* In the child. */
|
|
DPRINTF ("child: In the child\n");
|
|
selfid = getpid ();
|
|
DPRINTF ("child: Child pid is %d\n", (int) selfid);
|
|
|
|
/* Set all signals to SIG_DFL, except for SIGKILL, SIGSTOP, and SIGCHLD. */
|
|
for (i = 1; i < NSIG; i++)
|
|
{
|
|
int ret;
|
|
struct sigaction sig;
|
|
if (i == SIGKILL || i == SIGSTOP || i == SIGCHLD)
|
|
continue;
|
|
ret = sigaction (i, NULLSA, &sig);
|
|
if (ret != 0)
|
|
{
|
|
perror ("sigaction - get signal setting");
|
|
_exit (1);
|
|
}
|
|
if (sig.sa_handler != SIG_IGN)
|
|
{
|
|
sig.sa_handler = SIG_DFL;
|
|
sig.sa_flags = 0;
|
|
ret = sigemptyset (&sig.sa_mask);
|
|
if (ret != 0)
|
|
{
|
|
perror ("sigemptyset - set empty set");
|
|
_exit (1);
|
|
}
|
|
ret = sigaction (i, &sig, NULLSA);
|
|
if (ret != 0)
|
|
{
|
|
perror ("sigaction - set SIG_DFL");
|
|
_exit (1);
|
|
}
|
|
}
|
|
|
|
}
|
|
/* Call alrm when SIGALRM is delivered. */
|
|
struct sigaction new, old;
|
|
int saved_errno;
|
|
new.sa_handler = alrm;
|
|
new.sa_flags = 0;
|
|
sigemptyset (&new.sa_mask);
|
|
ret = sigaction (SIGALRM, &new, &old);
|
|
if (ret != 0)
|
|
{
|
|
perror ("sigaction - set SIGALRM action");
|
|
_exit (1);
|
|
}
|
|
/* Deliver an alarm in WAITTIME seconds... */
|
|
alarm (WAITTIME);
|
|
/* Try to write to a blocking stream that is full... */
|
|
ret = fputs("test string", fp);
|
|
saved_errno = errno;
|
|
/* Alarm should trigger. */
|
|
if (ret < 0)
|
|
{
|
|
DPRINTF ("fputs errno is %d\n", saved_errno);
|
|
}
|
|
if (saved_errno == EINTR)
|
|
printf ("PASS: fputs blocked on a pipe returned EINTR when interrupted by signal.\n");
|
|
else
|
|
{
|
|
printf ("FAIL: fputs blocked on a pipe returned errno %d instead of EINTR.\n", saved_errno);
|
|
_exit (1);
|
|
}
|
|
|
|
if (alrm_flag > 0)
|
|
{
|
|
DPRINTF ("child: alrm_flag was %d\n", alrm_flag);
|
|
}
|
|
_exit (0);
|
|
}
|
|
else
|
|
{
|
|
/* In the parent. */
|
|
pid_t wid;
|
|
int status, wstatus __attribute__ ((__unused__));
|
|
DPRINTF ("parent: In the parent\n");
|
|
DPRINTF ("parent: Child pid is %d\n", (int) child);
|
|
wid = waitpid (child, &status, 0);
|
|
if (wid == -1)
|
|
{
|
|
perror ("waitpid");
|
|
if (alrm_flag > 0)
|
|
{
|
|
printf ("FAIL: child process timed out.\n");
|
|
}
|
|
exit (1);
|
|
}
|
|
DPRINTF ("child status was %d\n", status);
|
|
if (!WIFEXITED(status))
|
|
{
|
|
printf ("FAIL: child did not exit normally.\n");
|
|
}
|
|
else
|
|
{
|
|
wstatus = WEXITSTATUS(status);
|
|
DPRINTF ("child exit status was: %d\n", wstatus);
|
|
}
|
|
}
|
|
/* ... clear the alarm. We are done the test. */
|
|
CLEAR_ALARM
|
|
if (alrm_flag > 0)
|
|
printf ("FAIL: test function timed out\n");
|
|
close (pfd[0]);
|
|
close (pfd[1]);
|
|
fclose (fp);
|
|
return 0;
|
|
}
|