| /* |
| * Copyright (c) International Business Machines Corp., 2001 |
| * Copyright (C) 2017 Cyril Hrubis <chrubis@suse.cz> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program 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 General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| /* |
| * DESCRIPTION |
| * Testcase to check the basic functionality of the times() system call. |
| * |
| * ALGORITHM |
| * This testcase checks the values that times(2) system call returns. |
| * Start a process, and spend some CPU time by performing a spin in |
| * a for-loop. Then use the times() system call, to determine the |
| * cpu time/sleep time, and other statistics. |
| * |
| * History |
| * 07/2001 John George |
| */ |
| |
| #include <sys/types.h> |
| #include <sys/times.h> |
| #include <errno.h> |
| #include <sys/wait.h> |
| #include <time.h> |
| #include <signal.h> |
| #include <stdlib.h> |
| |
| #include "tst_test.h" |
| |
| static volatile int timeout; |
| |
| static void sighandler(int signal) |
| { |
| if (signal == SIGALRM) |
| timeout = 1; |
| } |
| |
| static volatile int k; |
| |
| static void work(void) |
| { |
| int i, j; |
| |
| while (!timeout) |
| for (i = 0; i < 10000; i++) |
| for (j = 0; j < 100; j++) |
| k = i * j; |
| timeout = 0; |
| } |
| |
| static void generate_utime(void) |
| { |
| alarm(1); |
| work(); |
| } |
| |
| static void generate_stime(void) |
| { |
| time_t start_time, end_time; |
| struct tms buf; |
| |
| /* |
| * At least some CPU time must be used in system space. This is |
| * achieved by executing the times(2) call for |
| * atleast 2 secs. This logic makes it independant |
| * of the processor speed. |
| */ |
| start_time = time(NULL); |
| for (;;) { |
| if (times(&buf) == -1) |
| tst_res(TFAIL | TERRNO, "times failed"); |
| end_time = time(NULL); |
| if ((end_time - start_time) > 2) |
| return; |
| } |
| } |
| |
| static void verify_times(void) |
| { |
| int pid; |
| struct tms buf1, buf2, buf3; |
| |
| if (times(&buf1) == -1) |
| tst_brk(TBROK | TERRNO, "times()"); |
| |
| if (buf1.tms_utime > 5) |
| tst_res(TFAIL, "buf1.tms_utime = %li", buf1.tms_utime); |
| else |
| tst_res(TPASS, "buf1.tms_utime <= 5"); |
| |
| if (buf1.tms_stime > 5) |
| tst_res(TFAIL, "buf1.tms_stime = %li", buf1.tms_stime); |
| else |
| tst_res(TPASS, "buf1.tms_stime <= 5"); |
| |
| generate_utime(); |
| generate_stime(); |
| |
| if (times(&buf2) == -1) |
| tst_brk(TBROK | TERRNO, "times()"); |
| |
| if (buf2.tms_utime == 0) |
| tst_res(TFAIL, "buf2.tms_utime = 0"); |
| else |
| tst_res(TPASS, "buf2.tms_utime = %li", buf2.tms_utime); |
| |
| if (buf1.tms_utime >= buf2.tms_utime) { |
| tst_res(TFAIL, "buf1.tms_utime (%li) >= buf2.tms_utime (%li)", |
| buf1.tms_utime, buf2.tms_utime); |
| } else { |
| tst_res(TPASS, "buf1.tms_utime (%li) < buf2.tms_utime (%li)", |
| buf1.tms_utime, buf2.tms_utime); |
| } |
| |
| if (buf2.tms_stime == 0) |
| tst_res(TFAIL, "buf2.tms_stime = 0"); |
| else |
| tst_res(TPASS, "buf2.tms_stime = %li", buf2.tms_stime); |
| |
| if (buf1.tms_stime >= buf2.tms_stime) { |
| tst_res(TFAIL, "buf1.tms_stime (%li) >= buf2.tms_stime (%li)", |
| buf1.tms_stime, buf2.tms_stime); |
| } else { |
| tst_res(TPASS, "buf1.tms_stime (%li) < buf2.tms_stime (%li)", |
| buf1.tms_stime, buf2.tms_stime); |
| } |
| |
| if (buf2.tms_cutime != 0) |
| tst_res(TFAIL, "buf2.tms_cutime = %li", buf2.tms_cutime); |
| else |
| tst_res(TPASS, "buf2.tms_cutime = 0"); |
| |
| if (buf2.tms_cstime != 0) |
| tst_res(TFAIL, "buf2.tms_cstime = %li", buf2.tms_cstime); |
| else |
| tst_res(TPASS, "buf2.tms_cstime = 0"); |
| |
| pid = SAFE_FORK(); |
| |
| if (!pid) { |
| generate_utime(); |
| generate_stime(); |
| exit(0); |
| } |
| |
| SAFE_WAITPID(pid, NULL, 0); |
| |
| if (times(&buf3) == -1) |
| tst_brk(TBROK | TERRNO, "times()"); |
| |
| if (buf2.tms_utime > buf3.tms_utime) { |
| tst_res(TFAIL, "buf2.tms_utime (%li) > buf3.tms_utime (%li)", |
| buf2.tms_utime, buf3.tms_utime); |
| } else { |
| tst_res(TPASS, "buf2.tms_utime (%li) <= buf3.tms_utime (%li)", |
| buf2.tms_utime, buf3.tms_utime); |
| } |
| |
| if (buf2.tms_stime > buf3.tms_stime) { |
| tst_res(TFAIL, "buf2.tms_stime (%li) > buf3.tms_stime (%li)", |
| buf2.tms_stime, buf3.tms_stime); |
| } else { |
| tst_res(TPASS, "buf2.tms_stime (%li) <= buf3.tms_stime (%li)", |
| buf2.tms_stime, buf3.tms_stime); |
| } |
| |
| if (buf3.tms_cutime == 0) |
| tst_res(TFAIL, "buf3.tms_cutime = 0"); |
| else |
| tst_res(TPASS, "buf3.tms_cutime = %ld", buf3.tms_cutime); |
| |
| if (buf3.tms_cstime == 0) |
| tst_res(TFAIL, "buf3.tms_cstime = 0"); |
| else |
| tst_res(TPASS, "buf3.tms_cstime = %ld", buf3.tms_cstime); |
| |
| exit(0); |
| } |
| |
| /* |
| * Run the test in a child to reset times in case of -i option. |
| */ |
| static void do_test(void) |
| { |
| int pid = SAFE_FORK(); |
| |
| if (!pid) |
| verify_times(); |
| } |
| |
| static void setup(void) |
| { |
| SAFE_SIGNAL(SIGALRM, sighandler); |
| } |
| |
| static struct tst_test test = { |
| .setup = setup, |
| .forks_child = 1, |
| .test_all = do_test, |
| }; |