2005-04-27 16:03:47 +08:00
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/* Test program for process CPU clocks.
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2020-01-01 08:14:33 +08:00
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Copyright (C) 2004-2020 Free Software Foundation, Inc.
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2005-04-27 16:03:47 +08:00
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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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2012-02-10 07:18:22 +08:00
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License along with the GNU C Library; if not, see
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Prefer https to http for gnu.org and fsf.org URLs
Also, change sources.redhat.com to sourceware.org.
This patch was automatically generated by running the following shell
script, which uses GNU sed, and which avoids modifying files imported
from upstream:
sed -ri '
s,(http|ftp)(://(.*\.)?(gnu|fsf|sourceware)\.org($|[^.]|\.[^a-z])),https\2,g
s,(http|ftp)(://(.*\.)?)sources\.redhat\.com($|[^.]|\.[^a-z]),https\2sourceware.org\4,g
' \
$(find $(git ls-files) -prune -type f \
! -name '*.po' \
! -name 'ChangeLog*' \
! -path COPYING ! -path COPYING.LIB \
! -path manual/fdl-1.3.texi ! -path manual/lgpl-2.1.texi \
! -path manual/texinfo.tex ! -path scripts/config.guess \
! -path scripts/config.sub ! -path scripts/install-sh \
! -path scripts/mkinstalldirs ! -path scripts/move-if-change \
! -path INSTALL ! -path locale/programs/charmap-kw.h \
! -path po/libc.pot ! -path sysdeps/gnu/errlist.c \
! '(' -name configure \
-execdir test -f configure.ac -o -f configure.in ';' ')' \
! '(' -name preconfigure \
-execdir test -f preconfigure.ac ';' ')' \
-print)
and then by running 'make dist-prepare' to regenerate files built
from the altered files, and then executing the following to cleanup:
chmod a+x sysdeps/unix/sysv/linux/riscv/configure
# Omit irrelevant whitespace and comment-only changes,
# perhaps from a slightly-different Autoconf version.
git checkout -f \
sysdeps/csky/configure \
sysdeps/hppa/configure \
sysdeps/riscv/configure \
sysdeps/unix/sysv/linux/csky/configure
# Omit changes that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/powerpc/powerpc64/ppc-mcount.S: trailing lines
git checkout -f \
sysdeps/powerpc/powerpc64/ppc-mcount.S \
sysdeps/unix/sysv/linux/s390/s390-64/syscall.S
# Omit change that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S: last line does not end in newline
git checkout -f sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S
2019-09-07 13:40:42 +08:00
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<https://www.gnu.org/licenses/>. */
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2005-04-27 16:03:47 +08:00
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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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2014-12-20 06:00:59 +08:00
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#include <stdint.h>
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2005-04-27 16:03:47 +08:00
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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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2014-12-20 06:00:59 +08:00
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printf ("live PID %d clock %lx resolution %ju.%.9ju\n",
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child, (unsigned long int) child_clock,
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(uintmax_t) res.tv_sec, (uintmax_t) res.tv_nsec);
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2005-04-27 16:03:47 +08:00
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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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2012-02-10 19:18:48 +08:00
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/* Should be close to 0.0. */
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2014-12-20 06:00:59 +08:00
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printf ("live PID %d before sleep => %ju.%.9ju\n",
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child, (uintmax_t) before.tv_sec, (uintmax_t) before.tv_nsec);
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2005-04-27 16:03:47 +08:00
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struct timespec sleeptime = { .tv_nsec = 500000000 };
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2012-02-10 19:18:48 +08:00
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if (nanosleep (&sleeptime, NULL) != 0)
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{
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perror ("nanosleep");
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result = 1;
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goto done;
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}
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2005-04-27 16:03:47 +08:00
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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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2012-02-10 19:18:48 +08:00
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/* Should be close to 0.5. */
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2014-12-20 06:00:59 +08:00
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printf ("live PID %d after sleep => %ju.%.9ju\n",
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child, (uintmax_t) after.tv_sec, (uintmax_t) after.tv_nsec);
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2005-04-27 16:03:47 +08:00
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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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2014-12-20 06:00:59 +08:00
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printf ("before - after %ju.%.9ju outside reasonable range\n",
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(uintmax_t) diff.tv_sec, (uintmax_t) diff.tv_nsec);
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2005-04-27 16:03:47 +08:00
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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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2014-12-20 06:00:59 +08:00
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printf ("nanosleep time %ju.%.9ju outside reasonable range\n",
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(uintmax_t) d.tv_sec, (uintmax_t) d.tv_nsec);
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2005-04-27 16:03:47 +08:00
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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;
|
2012-02-10 19:18:48 +08:00
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if (nanosleep (&sleeptime, NULL) != 0)
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{
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perror ("nanosleep");
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result = 1;
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goto done;
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}
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2005-04-27 16:03:47 +08:00
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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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}
|
2012-02-10 19:18:48 +08:00
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/* Should be close to 0.6. */
|
2014-12-20 06:00:59 +08:00
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printf ("dead PID %d => %ju.%.9ju\n",
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child, (uintmax_t) dead.tv_sec, (uintmax_t) dead.tv_nsec);
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2005-04-27 16:03:47 +08:00
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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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{
|
2014-12-20 06:00:59 +08:00
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printf ("dead - after %ju.%.9ju outside reasonable range\n",
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(uintmax_t) diff.tv_sec, (uintmax_t) diff.tv_nsec);
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2005-04-27 16:03:47 +08:00
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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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{
|
2014-12-20 06:00:59 +08:00
|
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printf ("clock_gettime on reaped PID %d clock %lx => %ju%.9ju\n",
|
2005-04-27 16:03:47 +08:00
|
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child, (unsigned long int) child_clock,
|
2014-12-20 06:00:59 +08:00
|
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(uintmax_t) dead.tv_sec, (uintmax_t) dead.tv_nsec);
|
2005-04-27 16:03:47 +08:00
|
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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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|
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if (clock_getres (child_clock, &dead) == 0)
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{
|
2014-12-20 06:00:59 +08:00
|
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printf ("clock_getres on reaped PID %d clock %lx => %ju%.9ju\n",
|
2005-04-27 16:03:47 +08:00
|
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child, (unsigned long int) child_clock,
|
2014-12-20 06:00:59 +08:00
|
|
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(uintmax_t) dead.tv_sec, (uintmax_t) dead.tv_nsec);
|
2005-04-27 16:03:47 +08:00
|
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result = 1;
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}
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else
|
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{
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|
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if (errno != EINVAL)
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result = 1;
|
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|
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printf ("clock_getres on reaped PID %d clock %lx => %s\n",
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|
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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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|
|
|
}
|
|
|
|
int x;
|
|
|
|
if (waitpid (child, &x, 0) != child && errno != ECHILD)
|
|
|
|
{
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|
|
perror ("waitpid");
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|
|
return 2;
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|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return result;
|
|
|
|
}
|
|
|
|
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|
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|
|
|
|
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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