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026a84a54d
Using write without cheks leads to warn unused result when __wur is enabled. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
133 lines
2.6 KiB
C
133 lines
2.6 KiB
C
/* Tests for POSIX timer implementation using another process's CPU clock. */
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#include <unistd.h>
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#if _POSIX_THREADS && defined _POSIX_CPUTIME
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <fcntl.h>
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#include <time.h>
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#include <signal.h>
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#include <sys/wait.h>
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#include <support/xunistd.h>
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static clockid_t child_clock;
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#define TEST_CLOCK child_clock
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#define TEST_CLOCK_MISSING(clock) \
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(setup_test () ? "other-process CPU clock timer support" : NULL)
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/* This function is intended to rack up both user and system time. */
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static void
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chew_cpu (void)
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{
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while (1)
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{
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static volatile char buf[4096];
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for (int i = 0; i < 100; ++i)
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for (size_t j = 0; j < sizeof buf; ++j)
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buf[j] = 0xaa;
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int nullfd = open ("/dev/null", O_WRONLY);
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for (int i = 0; i < 100; ++i)
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for (size_t j = 0; j < sizeof buf; ++j)
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buf[j] = 0xbb;
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xwrite (nullfd, (char *) buf, sizeof buf);
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close (nullfd);
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if (getppid () == 1)
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_exit (2);
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}
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}
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static pid_t child;
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static void
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cleanup_child (void)
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{
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if (child <= 0)
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return;
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if (kill (child, SIGKILL) < 0 && errno != ESRCH)
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printf ("cannot kill child %d: %m\n", child);
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else
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{
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int status;
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errno = 0;
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if (waitpid (child, &status, 0) != child)
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printf ("waitpid %d: %m\n", child);
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}
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}
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#define CLEANUP_HANDLER cleanup_child ()
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static int
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setup_test (void)
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{
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/* Test timers on a process CPU clock by having a child process eating
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CPU. First make sure we can make such timers at all. */
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int pipefd[2];
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if (pipe (pipefd) < 0)
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{
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printf ("pipe: %m\n");
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exit (1);
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}
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child = fork ();
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if (child == 0)
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{
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char c;
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close (pipefd[1]);
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if (read (pipefd[0], &c, 1) == 1)
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chew_cpu ();
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_exit (1);
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}
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if (child < 0)
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{
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printf ("fork: %m\n");
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exit (1);
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}
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atexit (&cleanup_child);
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close (pipefd[0]);
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int e = clock_getcpuclockid (child, &child_clock);
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if (e == EPERM)
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{
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puts ("clock_getcpuclockid does not support other processes");
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return 1;
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}
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if (e != 0)
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{
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printf ("clock_getcpuclockid: %s\n", strerror (e));
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exit (1);
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}
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timer_t t;
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if (timer_create (TEST_CLOCK, NULL, &t) != 0)
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{
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printf ("timer_create: %m\n");
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return 1;
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}
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timer_delete (t);
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/* Get the child started chewing. */
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if (write (pipefd[1], "x", 1) != 1)
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{
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printf ("write to pipe: %m\n");
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return 1;
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}
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close (pipefd[1]);
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return 0;
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}
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#else
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# define TEST_CLOCK_MISSING(clock) "process clocks"
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#endif
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#include "tst-timer4.c"
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