308 lines
7.6 KiB
C
308 lines
7.6 KiB
C
/* Test program for process CPU clocks.
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Copyright (C) 2004 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <string.h>
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#include <errno.h>
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#include <signal.h>
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#include <sys/wait.h>
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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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write (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 int
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do_test (void)
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{
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int result = 0;
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clockid_t cl;
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int e;
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pid_t dead_child, child;
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/* Fork a child and let it die, to give us a PID known not be valid
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(assuming PIDs don't wrap around during the test). */
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{
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dead_child = fork ();
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if (dead_child == 0)
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_exit (0);
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if (dead_child < 0)
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{
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perror ("fork");
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return 1;
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}
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int x;
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if (wait (&x) != dead_child)
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{
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perror ("wait");
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return 2;
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}
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}
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/* POSIX says we should get ESRCH for this. */
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e = clock_getcpuclockid (dead_child, &cl);
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if (e != ENOSYS && e != ESRCH && e != EPERM)
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{
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printf ("clock_getcpuclockid on dead PID %d => %s\n",
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dead_child, strerror (e));
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result = 1;
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}
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/* Now give us a live child eating up CPU time. */
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child = fork ();
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if (child == 0)
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{
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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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perror ("fork");
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return 1;
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}
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e = clock_getcpuclockid (child, &cl);
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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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goto done;
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}
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if (e != 0)
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{
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printf ("clock_getcpuclockid on live PID %d => %s\n",
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child, strerror (e));
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result = 1;
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goto done;
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}
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const clockid_t child_clock = cl;
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struct timespec res;
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if (clock_getres (child_clock, &res) < 0)
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{
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printf ("clock_getres on live PID %d clock %lx => %s\n",
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child, (unsigned long int) child_clock, strerror (errno));
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result = 1;
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goto done;
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}
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printf ("live PID %d clock %lx resolution %lu.%.9lu\n",
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child, (unsigned long int) child_clock, res.tv_sec, res.tv_nsec);
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struct timespec before, after;
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if (clock_gettime (child_clock, &before) < 0)
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{
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printf ("clock_gettime on live PID %d clock %lx => %s\n",
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child, (unsigned long int) child_clock, strerror (errno));
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result = 1;
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goto done;
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}
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printf ("live PID %d before sleep => %lu.%.9lu\n",
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child, before.tv_sec, before.tv_nsec);
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struct timespec sleeptime = { .tv_nsec = 500000000 };
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nanosleep (&sleeptime, NULL);
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if (clock_gettime (child_clock, &after) < 0)
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{
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printf ("clock_gettime on live PID %d clock %lx => %s\n",
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child, (unsigned long int) child_clock, strerror (errno));
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result = 1;
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goto done;
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}
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printf ("live PID %d after sleep => %lu.%.9lu\n",
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child, after.tv_sec, after.tv_nsec);
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struct timespec diff = { .tv_sec = after.tv_sec - before.tv_sec,
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.tv_nsec = after.tv_nsec - before.tv_nsec };
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if (diff.tv_nsec < 0)
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{
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--diff.tv_sec;
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diff.tv_nsec += 1000000000;
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}
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if (diff.tv_sec != 0
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|| diff.tv_nsec > 600000000
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|| diff.tv_nsec < 100000000)
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{
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printf ("before - after %lu.%.9lu outside reasonable range\n",
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diff.tv_sec, diff.tv_nsec);
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result = 1;
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}
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sleeptime.tv_nsec = 100000000;
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e = clock_nanosleep (child_clock, 0, &sleeptime, NULL);
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if (e == EINVAL || e == ENOTSUP || e == ENOSYS)
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{
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printf ("clock_nanosleep not supported for other process clock: %s\n",
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strerror (e));
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}
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else if (e != 0)
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{
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printf ("clock_nanosleep on other process clock: %s\n", strerror (e));
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result = 1;
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}
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else
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{
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struct timespec afterns;
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if (clock_gettime (child_clock, &afterns) < 0)
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{
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printf ("clock_gettime on live PID %d clock %lx => %s\n",
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child, (unsigned long int) child_clock, strerror (errno));
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result = 1;
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}
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else
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{
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struct timespec d = { .tv_sec = afterns.tv_sec - after.tv_sec,
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.tv_nsec = afterns.tv_nsec - after.tv_nsec };
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if (d.tv_nsec < 0)
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{
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--d.tv_sec;
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d.tv_nsec += 1000000000;
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}
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if (d.tv_sec > 0
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|| d.tv_nsec < sleeptime.tv_nsec
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|| d.tv_nsec > sleeptime.tv_nsec * 2)
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{
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printf ("nanosleep time %lu.%.9lu outside reasonable range\n",
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d.tv_sec, d.tv_nsec);
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result = 1;
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}
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}
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}
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if (kill (child, SIGKILL) != 0)
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{
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perror ("kill");
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result = 2;
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goto done;
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}
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/* Wait long enough to let the child finish dying. */
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sleeptime.tv_nsec = 200000000;
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nanosleep (&sleeptime, NULL);
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struct timespec dead;
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if (clock_gettime (child_clock, &dead) < 0)
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{
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printf ("clock_gettime on dead PID %d clock %lx => %s\n",
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child, (unsigned long int) child_clock, strerror (errno));
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result = 1;
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goto done;
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}
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printf ("dead PID %d => %lu.%.9lu\n",
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child, dead.tv_sec, dead.tv_nsec);
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diff.tv_sec = dead.tv_sec - after.tv_sec;
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diff.tv_nsec = dead.tv_nsec - after.tv_nsec;
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if (diff.tv_nsec < 0)
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{
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--diff.tv_sec;
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diff.tv_nsec += 1000000000;
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}
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if (diff.tv_sec != 0 || diff.tv_nsec > 200000000)
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{
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printf ("dead - after %lu.%.9lu outside reasonable range\n",
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diff.tv_sec, diff.tv_nsec);
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result = 1;
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}
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/* Now reap the child and verify that its clock is no longer valid. */
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{
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int x;
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if (waitpid (child, &x, 0) != child)
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{
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perror ("waitpid");
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result = 1;
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}
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}
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if (clock_gettime (child_clock, &dead) == 0)
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{
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printf ("clock_gettime on reaped PID %d clock %lx => %lu%.9lu\n",
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child, (unsigned long int) child_clock,
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dead.tv_sec, dead.tv_nsec);
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result = 1;
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}
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else
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{
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if (errno != EINVAL)
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result = 1;
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printf ("clock_gettime on reaped PID %d clock %lx => %s\n",
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child, (unsigned long int) child_clock, strerror (errno));
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}
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if (clock_getres (child_clock, &dead) == 0)
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{
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printf ("clock_getres on reaped PID %d clock %lx => %lu%.9lu\n",
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child, (unsigned long int) child_clock,
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dead.tv_sec, dead.tv_nsec);
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result = 1;
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}
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else
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{
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if (errno != EINVAL)
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result = 1;
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printf ("clock_getres on reaped PID %d clock %lx => %s\n",
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child, (unsigned long int) child_clock, strerror (errno));
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}
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return result;
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done:
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{
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if (kill (child, SIGKILL) != 0 && errno != ESRCH)
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{
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perror ("kill");
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return 2;
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}
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int x;
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if (waitpid (child, &x, 0) != child && errno != ECHILD)
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{
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perror ("waitpid");
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return 2;
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}
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}
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return result;
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}
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#define TIMEOUT 5
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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