144 lines
4.1 KiB
C
144 lines
4.1 KiB
C
/*
|
|
* Copyright (c) 2015 Eugene Syromyatnikov <evgsyr@gmail.com>
|
|
* Copyright (c) 2015-2016 Dmitry V. Levin <ldv@altlinux.org>
|
|
* Copyright (c) 2015-2017 The strace developers.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. The name of the author may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* This test burns some CPU cycles in user space and kernel space in order to
|
|
* get some non-zero values returned by times(2).
|
|
*/
|
|
|
|
#include "tests.h"
|
|
#include <sched.h>
|
|
#include <stdio.h>
|
|
#include <time.h>
|
|
#include <unistd.h>
|
|
|
|
#include <asm/unistd.h>
|
|
#include <sys/times.h>
|
|
#include <sys/wait.h>
|
|
|
|
enum {
|
|
NUM_USER_ITERS = 1000000,
|
|
PARENT_CPUTIME_LIMIT_NSEC = 200000000,
|
|
CHILD_CPUTIME_LIMIT_NSEC = 300000000
|
|
};
|
|
|
|
int
|
|
main(void)
|
|
{
|
|
struct timespec ts;
|
|
volatile int dummy = 0;
|
|
int i = 0;
|
|
|
|
pid_t pid = fork();
|
|
if (pid < 0)
|
|
perror_msg_and_fail("fork");
|
|
|
|
const long cputime_limit =
|
|
pid ? PARENT_CPUTIME_LIMIT_NSEC : CHILD_CPUTIME_LIMIT_NSEC;
|
|
|
|
/* Enjoying my user time */
|
|
while (clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts) == 0) {
|
|
if (ts.tv_sec || ts.tv_nsec >= cputime_limit)
|
|
break;
|
|
|
|
if (i && !(ts.tv_sec || ts.tv_nsec))
|
|
error_msg_and_skip("clock_gettime(CLOCK_PROCESS_CPUTIME_ID, {0, 0})");
|
|
|
|
for (i = 0; i < NUM_USER_ITERS; ++i)
|
|
++dummy;
|
|
}
|
|
|
|
/* Enjoying my system time */
|
|
while (clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts) == 0) {
|
|
if (ts.tv_sec || ts.tv_nsec >= cputime_limit * 2)
|
|
break;
|
|
|
|
sched_yield();
|
|
}
|
|
|
|
if (pid == 0) {
|
|
return 0;
|
|
} else {
|
|
wait(NULL);
|
|
}
|
|
|
|
struct tms tbuf;
|
|
unsigned long long llres;
|
|
|
|
/*
|
|
* On systems where user's and kernel's long types are the same,
|
|
* prefer direct times syscall over libc's times function because
|
|
* the latter is more prone to return value truncation.
|
|
*/
|
|
#undef USE_LIBC_SYSCALL
|
|
#if defined __NR_times && \
|
|
!defined(LINUX_MIPSN32) && \
|
|
!(defined __x86_64__ && defined __ILP32__)
|
|
# define USE_LIBC_SYSCALL 1
|
|
#endif
|
|
|
|
#if defined USE_LIBC_SYSCALL
|
|
long res = syscall(__NR_times, &tbuf);
|
|
|
|
if (-1L == res)
|
|
perror_msg_and_skip("times");
|
|
else
|
|
llres = (unsigned long) res;
|
|
#elif defined __NR_times && defined __x86_64__ && defined __ILP32__
|
|
register long arg asm("rdi") = (long) &tbuf;
|
|
asm volatile("syscall\n\t"
|
|
: "=a"(llres)
|
|
: "0"(__NR_times), "r"(arg)
|
|
: "memory", "cc", "r11", "cx");
|
|
if (llres > 0xfffffffffffff000)
|
|
return 77;
|
|
#else
|
|
clock_t res = times(&tbuf);
|
|
|
|
if ((clock_t) -1 == res)
|
|
perror_msg_and_skip("times");
|
|
if (sizeof(res) < sizeof(unsigned long long))
|
|
llres = (unsigned long) res;
|
|
else
|
|
llres = res;
|
|
#endif
|
|
|
|
printf("times({tms_utime=%llu, tms_stime=%llu, ",
|
|
(unsigned long long) tbuf.tms_utime,
|
|
(unsigned long long) tbuf.tms_stime);
|
|
printf("tms_cutime=%llu, tms_cstime=%llu}) = %llu\n",
|
|
(unsigned long long) tbuf.tms_cutime,
|
|
(unsigned long long) tbuf.tms_cstime,
|
|
llres);
|
|
puts("+++ exited with 0 +++");
|
|
|
|
return 0;
|
|
}
|