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glibc/rt/tst-cpuclock1.c
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/* Test program for process CPU clocks. | |
Copyright (C) 2004-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <time.h> | |
#include <unistd.h> | |
#include <fcntl.h> | |
#include <string.h> | |
#include <errno.h> | |
#include <signal.h> | |
#include <stdint.h> | |
#include <sys/wait.h> | |
/* 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 int | |
do_test (void) | |
{ | |
int result = 0; | |
clockid_t cl; | |
int e; | |
pid_t dead_child, child; | |
/* Fork a child and let it die, to give us a PID known not be valid | |
(assuming PIDs don't wrap around during the test). */ | |
{ | |
dead_child = fork (); | |
if (dead_child == 0) | |
_exit (0); | |
if (dead_child < 0) | |
{ | |
perror ("fork"); | |
return 1; | |
} | |
int x; | |
if (wait (&x) != dead_child) | |
{ | |
perror ("wait"); | |
return 2; | |
} | |
} | |
/* POSIX says we should get ESRCH for this. */ | |
e = clock_getcpuclockid (dead_child, &cl); | |
if (e != ENOSYS && e != ESRCH && e != EPERM) | |
{ | |
printf ("clock_getcpuclockid on dead PID %d => %s\n", | |
dead_child, strerror (e)); | |
result = 1; | |
} | |
/* Now give us a live child eating up CPU time. */ | |
child = fork (); | |
if (child == 0) | |
{ | |
chew_cpu (); | |
_exit (1); | |
} | |
if (child < 0) | |
{ | |
perror ("fork"); | |
return 1; | |
} | |
e = clock_getcpuclockid (child, &cl); | |
if (e == EPERM) | |
{ | |
puts ("clock_getcpuclockid does not support other processes"); | |
goto done; | |
} | |
if (e != 0) | |
{ | |
printf ("clock_getcpuclockid on live PID %d => %s\n", | |
child, strerror (e)); | |
result = 1; | |
goto done; | |
} | |
const clockid_t child_clock = cl; | |
struct timespec res; | |
if (clock_getres (child_clock, &res) < 0) | |
{ | |
printf ("clock_getres on live PID %d clock %lx => %s\n", | |
child, (unsigned long int) child_clock, strerror (errno)); | |
result = 1; | |
goto done; | |
} | |
printf ("live PID %d clock %lx resolution %ju.%.9ju\n", | |
child, (unsigned long int) child_clock, | |
(uintmax_t) res.tv_sec, (uintmax_t) res.tv_nsec); | |
struct timespec before, after; | |
if (clock_gettime (child_clock, &before) < 0) | |
{ | |
printf ("clock_gettime on live PID %d clock %lx => %s\n", | |
child, (unsigned long int) child_clock, strerror (errno)); | |
result = 1; | |
goto done; | |
} | |
/* Should be close to 0.0. */ | |
printf ("live PID %d before sleep => %ju.%.9ju\n", | |
child, (uintmax_t) before.tv_sec, (uintmax_t) before.tv_nsec); | |
struct timespec sleeptime = { .tv_nsec = 500000000 }; | |
if (nanosleep (&sleeptime, NULL) != 0) | |
{ | |
perror ("nanosleep"); | |
result = 1; | |
goto done; | |
} | |
if (clock_gettime (child_clock, &after) < 0) | |
{ | |
printf ("clock_gettime on live PID %d clock %lx => %s\n", | |
child, (unsigned long int) child_clock, strerror (errno)); | |
result = 1; | |
goto done; | |
} | |
/* Should be close to 0.5. */ | |
printf ("live PID %d after sleep => %ju.%.9ju\n", | |
child, (uintmax_t) after.tv_sec, (uintmax_t) after.tv_nsec); | |
struct timespec diff = { .tv_sec = after.tv_sec - before.tv_sec, | |
.tv_nsec = after.tv_nsec - before.tv_nsec }; | |
if (diff.tv_nsec < 0) | |
{ | |
--diff.tv_sec; | |
diff.tv_nsec += 1000000000; | |
} | |
if (diff.tv_sec != 0 | |
|| diff.tv_nsec > 600000000 | |
|| diff.tv_nsec < 100000000) | |
{ | |
printf ("before - after %ju.%.9ju outside reasonable range\n", | |
(uintmax_t) diff.tv_sec, (uintmax_t) diff.tv_nsec); | |
result = 1; | |
} | |
sleeptime.tv_nsec = 100000000; | |
e = clock_nanosleep (child_clock, 0, &sleeptime, NULL); | |
if (e == EINVAL || e == ENOTSUP || e == ENOSYS) | |
{ | |
printf ("clock_nanosleep not supported for other process clock: %s\n", | |
strerror (e)); | |
} | |
else if (e != 0) | |
{ | |
printf ("clock_nanosleep on other process clock: %s\n", strerror (e)); | |
result = 1; | |
} | |
else | |
{ | |
struct timespec afterns; | |
if (clock_gettime (child_clock, &afterns) < 0) | |
{ | |
printf ("clock_gettime on live PID %d clock %lx => %s\n", | |
child, (unsigned long int) child_clock, strerror (errno)); | |
result = 1; | |
} | |
else | |
{ | |
struct timespec d = { .tv_sec = afterns.tv_sec - after.tv_sec, | |
.tv_nsec = afterns.tv_nsec - after.tv_nsec }; | |
if (d.tv_nsec < 0) | |
{ | |
--d.tv_sec; | |
d.tv_nsec += 1000000000; | |
} | |
if (d.tv_sec > 0 | |
|| d.tv_nsec < sleeptime.tv_nsec | |
|| d.tv_nsec > sleeptime.tv_nsec * 2) | |
{ | |
printf ("nanosleep time %ju.%.9ju outside reasonable range\n", | |
(uintmax_t) d.tv_sec, (uintmax_t) d.tv_nsec); | |
result = 1; | |
} | |
} | |
} | |
if (kill (child, SIGKILL) != 0) | |
{ | |
perror ("kill"); | |
result = 2; | |
goto done; | |
} | |
/* Wait long enough to let the child finish dying. */ | |
sleeptime.tv_nsec = 200000000; | |
if (nanosleep (&sleeptime, NULL) != 0) | |
{ | |
perror ("nanosleep"); | |
result = 1; | |
goto done; | |
} | |
struct timespec dead; | |
if (clock_gettime (child_clock, &dead) < 0) | |
{ | |
printf ("clock_gettime on dead PID %d clock %lx => %s\n", | |
child, (unsigned long int) child_clock, strerror (errno)); | |
result = 1; | |
goto done; | |
} | |
/* Should be close to 0.6. */ | |
printf ("dead PID %d => %ju.%.9ju\n", | |
child, (uintmax_t) dead.tv_sec, (uintmax_t) dead.tv_nsec); | |
diff.tv_sec = dead.tv_sec - after.tv_sec; | |
diff.tv_nsec = dead.tv_nsec - after.tv_nsec; | |
if (diff.tv_nsec < 0) | |
{ | |
--diff.tv_sec; | |
diff.tv_nsec += 1000000000; | |
} | |
if (diff.tv_sec != 0 || diff.tv_nsec > 200000000) | |
{ | |
printf ("dead - after %ju.%.9ju outside reasonable range\n", | |
(uintmax_t) diff.tv_sec, (uintmax_t) diff.tv_nsec); | |
result = 1; | |
} | |
/* Now reap the child and verify that its clock is no longer valid. */ | |
{ | |
int x; | |
if (waitpid (child, &x, 0) != child) | |
{ | |
perror ("waitpid"); | |
result = 1; | |
} | |
} | |
if (clock_gettime (child_clock, &dead) == 0) | |
{ | |
printf ("clock_gettime on reaped PID %d clock %lx => %ju%.9ju\n", | |
child, (unsigned long int) child_clock, | |
(uintmax_t) dead.tv_sec, (uintmax_t) dead.tv_nsec); | |
result = 1; | |
} | |
else | |
{ | |
if (errno != EINVAL) | |
result = 1; | |
printf ("clock_gettime on reaped PID %d clock %lx => %s\n", | |
child, (unsigned long int) child_clock, strerror (errno)); | |
} | |
if (clock_getres (child_clock, &dead) == 0) | |
{ | |
printf ("clock_getres on reaped PID %d clock %lx => %ju%.9ju\n", | |
child, (unsigned long int) child_clock, | |
(uintmax_t) dead.tv_sec, (uintmax_t) dead.tv_nsec); | |
result = 1; | |
} | |
else | |
{ | |
if (errno != EINVAL) | |
result = 1; | |
printf ("clock_getres on reaped PID %d clock %lx => %s\n", | |
child, (unsigned long int) child_clock, strerror (errno)); | |
} | |
return result; | |
done: | |
{ | |
if (kill (child, SIGKILL) != 0 && errno != ESRCH) | |
{ | |
perror ("kill"); | |
return 2; | |
} | |
int x; | |
if (waitpid (child, &x, 0) != child && errno != ECHILD) | |
{ | |
perror ("waitpid"); | |
return 2; | |
} | |
} | |
return result; | |
} | |
#define TIMEOUT 5 | |
#define TEST_FUNCTION do_test () | |
#include "../test-skeleton.c" |