131 lines
2.5 KiB
C
131 lines
2.5 KiB
C
/* Tests for POSIX timer implementation using another process's CPU clock. */
|
|
|
|
#include <unistd.h>
|
|
|
|
#if _POSIX_THREADS && defined _POSIX_CPUTIME
|
|
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <fcntl.h>
|
|
#include <time.h>
|
|
#include <signal.h>
|
|
#include <sys/wait.h>
|
|
|
|
static clockid_t child_clock;
|
|
|
|
#define TEST_CLOCK child_clock
|
|
#define TEST_CLOCK_MISSING(clock) \
|
|
(setup_test () ? "other-process CPU clock timer support" : NULL)
|
|
|
|
/* This function is intended to rack up both user and system time. */
|
|
static void
|
|
chew_cpu (void)
|
|
{
|
|
while (1)
|
|
{
|
|
static volatile char buf[4096];
|
|
for (int i = 0; i < 100; ++i)
|
|
for (size_t j = 0; j < sizeof buf; ++j)
|
|
buf[j] = 0xaa;
|
|
int nullfd = open ("/dev/null", O_WRONLY);
|
|
for (int i = 0; i < 100; ++i)
|
|
for (size_t j = 0; j < sizeof buf; ++j)
|
|
buf[j] = 0xbb;
|
|
write (nullfd, (char *) buf, sizeof buf);
|
|
close (nullfd);
|
|
if (getppid () == 1)
|
|
_exit (2);
|
|
}
|
|
}
|
|
|
|
static pid_t child;
|
|
static void
|
|
cleanup_child (void)
|
|
{
|
|
if (child <= 0)
|
|
return;
|
|
if (kill (child, SIGKILL) < 0 && errno != ESRCH)
|
|
printf ("cannot kill child %d: %m\n", child);
|
|
else
|
|
{
|
|
int status;
|
|
errno = 0;
|
|
if (waitpid (child, &status, 0) != child)
|
|
printf ("waitpid %d: %m\n", child);
|
|
}
|
|
}
|
|
#define CLEANUP_HANDLER cleanup_child ()
|
|
|
|
static int
|
|
setup_test (void)
|
|
{
|
|
/* Test timers on a process CPU clock by having a child process eating
|
|
CPU. First make sure we can make such timers at all. */
|
|
|
|
int pipefd[2];
|
|
if (pipe (pipefd) < 0)
|
|
{
|
|
printf ("pipe: %m\n");
|
|
exit (1);
|
|
}
|
|
|
|
child = fork ();
|
|
|
|
if (child == 0)
|
|
{
|
|
char c;
|
|
close (pipefd[1]);
|
|
if (read (pipefd[0], &c, 1) == 1)
|
|
chew_cpu ();
|
|
_exit (1);
|
|
}
|
|
|
|
if (child < 0)
|
|
{
|
|
printf ("fork: %m\n");
|
|
exit (1);
|
|
}
|
|
|
|
atexit (&cleanup_child);
|
|
|
|
close (pipefd[0]);
|
|
|
|
int e = clock_getcpuclockid (child, &child_clock);
|
|
if (e == EPERM)
|
|
{
|
|
puts ("clock_getcpuclockid does not support other processes");
|
|
return 1;
|
|
}
|
|
if (e != 0)
|
|
{
|
|
printf ("clock_getcpuclockid: %s\n", strerror (e));
|
|
exit (1);
|
|
}
|
|
|
|
timer_t t;
|
|
if (timer_create (TEST_CLOCK, NULL, &t) != 0)
|
|
{
|
|
printf ("timer_create: %m\n");
|
|
return 1;
|
|
}
|
|
timer_delete (t);
|
|
|
|
/* Get the child started chewing. */
|
|
if (write (pipefd[1], "x", 1) != 1)
|
|
{
|
|
printf ("write to pipe: %m\n");
|
|
return 1;
|
|
}
|
|
close (pipefd[1]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#else
|
|
# define TEST_CLOCK_MISSING(clock) "process clocks"
|
|
#endif
|
|
|
|
#include "tst-timer4.c"
|