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/*
* Copyright (c) 2020-2021 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#include "scno.h"
#include "pidns.h"
#if defined __NR_getpid && (!defined __NR_getxpid || __NR_getxpid != __NR_getpid)
# include <stdio.h>
# include <unistd.h>
# include <sys/time.h>
# define SYSCALL_COUNT 10000
/**
* Max ratio of the execution time with and without pidns translation.
*/
# define MAX_TIME_RATIO 20
static long
execute_syscalls(void)
{
/* Load our PID in the cache */
syscall(__NR_getpid);
struct timeval stop, start;
gettimeofday(&start, NULL);
for (int i = 0; i < SYSCALL_COUNT; i++)
syscall(__NR_getpid);
gettimeofday(&stop, NULL);
return (stop.tv_usec - start.tv_usec) +
(stop.tv_sec - start.tv_sec) * 1000000;
}
int
main(void)
{
long orig_us = execute_syscalls();
long max_us = orig_us * MAX_TIME_RATIO;
pidns_test_init();
long us = execute_syscalls();
fprintf(stderr, "Before PID NS test init: %ld\n"
"After PID NS test init: %ld (%.2f times slower)\n",
orig_us, us, (float) us / orig_us);
if (us > max_us)
error_msg_and_fail("pidns translation took too long: %ld us "
"(max: %ld us)", us, max_us);
return 0;
}
#else
SKIP_MAIN_UNDEFINED("__NR_getpid")
#endif
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