Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 | // SPDX-License-Identifier: GPL-2.0 #define _GNU_SOURCE #include <sched.h> #include <linux/unistd.h> #include <linux/futex.h> #include <stdio.h> #include <string.h> #include <sys/syscall.h> #include <sys/types.h> #include <sys/wait.h> #include <time.h> #include <unistd.h> #include "log.h" #include "timens.h" #define NSEC_PER_SEC 1000000000ULL static int run_test(int clockid) { int futex_op = FUTEX_WAIT_BITSET; struct timespec timeout, end; int val = 0; if (clockid == CLOCK_REALTIME) futex_op |= FUTEX_CLOCK_REALTIME; clock_gettime(clockid, &timeout); timeout.tv_nsec += NSEC_PER_SEC / 10; // 100ms if (timeout.tv_nsec > NSEC_PER_SEC) { timeout.tv_sec++; timeout.tv_nsec -= NSEC_PER_SEC; } if (syscall(__NR_futex, &val, futex_op, 0, &timeout, 0, FUTEX_BITSET_MATCH_ANY) >= 0) { ksft_test_result_fail("futex didn't return ETIMEDOUT\n"); return 1; } if (errno != ETIMEDOUT) { ksft_test_result_fail("futex didn't return ETIMEDOUT: %s\n", strerror(errno)); return 1; } clock_gettime(clockid, &end); if (end.tv_sec < timeout.tv_sec || (end.tv_sec == timeout.tv_sec && end.tv_nsec < timeout.tv_nsec)) { ksft_test_result_fail("futex slept less than 100ms\n"); return 1; } ksft_test_result_pass("futex with the %d clockid\n", clockid); return 0; } int main(int argc, char *argv[]) { int status, len, fd; char buf[4096]; pid_t pid; struct timespec mtime_now; nscheck(); ksft_set_plan(2); clock_gettime(CLOCK_MONOTONIC, &mtime_now); if (unshare_timens()) return 1; len = snprintf(buf, sizeof(buf), "%d %d 0", CLOCK_MONOTONIC, 70 * 24 * 3600); fd = open("/proc/self/timens_offsets", O_WRONLY); if (fd < 0) return pr_perror("/proc/self/timens_offsets"); if (write(fd, buf, len) != len) return pr_perror("/proc/self/timens_offsets"); close(fd); pid = fork(); if (pid < 0) return pr_perror("Unable to fork"); if (pid == 0) { int ret = 0; ret |= run_test(CLOCK_REALTIME); ret |= run_test(CLOCK_MONOTONIC); if (ret) ksft_exit_fail(); ksft_exit_pass(); return 0; } if (waitpid(pid, &status, 0) != pid) return pr_perror("Unable to wait the child process"); if (WIFEXITED(status)) return WEXITSTATUS(status); return 1; } |