diff options
Diffstat (limited to 'rt/tst-cputimer3.c')
-rw-r--r-- | rt/tst-cputimer3.c | 130 |
1 files changed, 0 insertions, 130 deletions
diff --git a/rt/tst-cputimer3.c b/rt/tst-cputimer3.c deleted file mode 100644 index 056766a..0000000 --- a/rt/tst-cputimer3.c +++ /dev/null @@ -1,130 +0,0 @@ -/* 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" |