2 * Check delay injection.
4 * Copyright (c) 2018 The strace developers.
7 * SPDX-License-Identifier: GPL-2.0-or-later
19 #include <asm/unistd.h>
22 usecs_from_tv(const struct timeval *const tv)
24 return (int64_t) tv->tv_sec * 1000000 + tv->tv_usec;
28 usecs_from_ts(const struct timespec *const ts)
30 return (int64_t) ts->tv_sec * 1000000 + ts->tv_nsec / 1000;
34 check_delay(const struct timeval *const tv0,
35 const struct timespec *const ts,
36 const struct timeval *const tv1,
38 const int64_t delay_enter,
39 const int64_t delay_exit)
41 const int64_t us0 = usecs_from_tv(tv0);
42 const int64_t us = usecs_from_ts(ts);
43 const int64_t us1 = usecs_from_tv(tv1);
45 if (us - us0 < delay_exit * (nproc - 1) / nproc)
48 if (us - us0 > delay_exit * (nproc + 1) / nproc)
51 if (us1 - us < delay_enter * (nproc - 1) / nproc)
54 if (us1 - us > delay_enter * (nproc + 1) / nproc)
59 run(const int nproc, const int delay_enter, const int delay_exit)
61 struct timeval prev = { 0, 0 }, now;
63 for (int i = 0; i < nproc; ++i, prev = now) {
66 if (i && clock_gettime(CLOCK_REALTIME, &ts))
67 perror_msg_and_fail("clock_gettime");
69 if (syscall(__NR_gettimeofday, &now, NULL))
70 perror_msg_and_fail("gettimeofday");
75 check_delay(&prev, &ts, &now, nproc, delay_enter, delay_exit);
82 main(int ac, char *av[])
85 error_msg_and_fail("usage: delay <nproc> <delay_enter> <delay_exit>");
87 const int nproc = atoi(av[1]);
89 perror_msg_and_fail("invalid nproc: %s", av[1]);
91 const int delay_enter = atoi(av[2]);
93 perror_msg_and_fail("invalid delay_enter: %s", av[2]);
95 const int delay_exit = atoi(av[3]);
97 perror_msg_and_fail("invalid delay_exit: %s", av[3]);
99 for (int i = 0; i < nproc; ++i) {
103 usleep(MAX(delay_enter, delay_exit) / nproc);
105 run(nproc, delay_enter, delay_exit);
109 while (wait(&status) > 0) {
111 perror_msg_and_fail("wait status %d", status);