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/*
* Check decoding of times syscall.
*
* Copyright (c) 2015-2021 Eugene Syromyatnikov <evgsyr@gmail.com>
* Copyright (c) 2015-2016 Dmitry V. Levin <ldv@strace.io>
* Copyright (c) 2015-2022 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
/**
* @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 <fcntl.h>
#include <sched.h>
#include <stdio.h>
#include <time.h>
#include <unistd.h>
#include "scno.h"
#include <sys/stat.h>
#include <sys/times.h>
#include <sys/types.h>
#include <sys/wait.h>
#include "time_enjoyment.h"
enum {
PARENT_CPUTIME_LIMIT_NSEC = 300000000,
CHILD_CPUTIME_LIMIT_NSEC = 500000000,
};
int
main(void)
{
enjoy_time(PARENT_CPUTIME_LIMIT_NSEC);
pid_t pid = fork();
if (pid < 0)
perror_msg_and_fail("fork");
if (pid == 0) {
enjoy_time(CHILD_CPUTIME_LIMIT_NSEC);
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.
*/
#if 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;
#elif defined LINUX_MIPSN32
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;
#else
long res = syscall(__NR_times, &tbuf);
if (-1L == res)
perror_msg_and_skip("times");
else
llres = (unsigned long) res;
#endif
long clk_tck = sysconf(_SC_CLK_TCK);
int precision = clk_tck > 100000000 ? 9
: clk_tck > 10000000 ? 8
: clk_tck > 1000000 ? 7
: clk_tck > 100000 ? 6
: clk_tck > 10000 ? 5
: clk_tck > 1000 ? 4
: clk_tck > 100 ? 3
: clk_tck > 10 ? 2
: clk_tck > 1 ? 1 : 0;
if (!XLAT_RAW && clk_tck > 0) {
printf("times({tms_utime=%llu /* %.*f s */"
", tms_stime=%llu /* %.*f s */"
", tms_cutime=%llu /* %.*f s */"
", tms_cstime=%llu /* %.*f s */}) = %llu\n",
(unsigned long long) tbuf.tms_utime,
precision, (double) tbuf.tms_utime / clk_tck,
(unsigned long long) tbuf.tms_stime,
precision, (double) tbuf.tms_stime / clk_tck,
(unsigned long long) tbuf.tms_cutime,
precision, (double) tbuf.tms_cutime / clk_tck,
(unsigned long long) tbuf.tms_cstime,
precision, (double) tbuf.tms_cstime / clk_tck,
llres);
} else {
printf("times({tms_utime=%llu, tms_stime=%llu"
", tms_cutime=%llu, tms_cstime=%llu}) = %llu\n",
(unsigned long long) tbuf.tms_utime,
(unsigned long long) tbuf.tms_stime,
(unsigned long long) tbuf.tms_cutime,
(unsigned long long) tbuf.tms_cstime,
llres);
}
puts("+++ exited with 0 +++");
return 0;
}
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