61c5767603
A test to check that all supported clocks work on host and inside a new time namespace. Use both ways to get time: through VDSO and by entering the kernel with implicit syscall. Introduce a new timens directory in selftests framework for the next timens tests. Output on success: 1..10 ok 1 Passed for CLOCK_BOOTTIME (syscall) ok 2 Passed for CLOCK_BOOTTIME (vdso) ok 3 Passed for CLOCK_BOOTTIME_ALARM (syscall) ok 4 Passed for CLOCK_BOOTTIME_ALARM (vdso) ok 5 Passed for CLOCK_MONOTONIC (syscall) ok 6 Passed for CLOCK_MONOTONIC (vdso) ok 7 Passed for CLOCK_MONOTONIC_COARSE (syscall) ok 8 Passed for CLOCK_MONOTONIC_COARSE (vdso) ok 9 Passed for CLOCK_MONOTONIC_RAW (syscall) ok 10 Passed for CLOCK_MONOTONIC_RAW (vdso) # Pass 10 Fail 0 Xfail 0 Xpass 0 Skip 0 Error 0 Output with lack of permissions: 1..10 not ok 1 # SKIP need to run as root Output without support of time namespaces: 1..10 not ok 1 # SKIP Time namespaces are not supported Co-developed-by: Andrei Vagin <avagin@openvz.org> Signed-off-by: Andrei Vagin <avagin@gmail.com> Signed-off-by: Dmitry Safonov <dima@arista.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lore.kernel.org/r/20191112012724.250792-29-dima@arista.com
101 lines
2.0 KiB
C
101 lines
2.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __TIMENS_H__
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#define __TIMENS_H__
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include "../kselftest.h"
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#ifndef CLONE_NEWTIME
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# define CLONE_NEWTIME 0x00000080
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#endif
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static int config_posix_timers = true;
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static inline void check_config_posix_timers(void)
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{
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if (timer_create(-1, 0, 0) == -1 && errno == ENOSYS)
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config_posix_timers = false;
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}
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static inline bool check_skip(int clockid)
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{
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if (config_posix_timers)
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return false;
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switch (clockid) {
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/* Only these clocks are supported without CONFIG_POSIX_TIMERS. */
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case CLOCK_BOOTTIME:
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case CLOCK_MONOTONIC:
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case CLOCK_REALTIME:
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return false;
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default:
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ksft_test_result_skip("Posix Clocks & timers are not supported\n");
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return true;
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}
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return false;
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}
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static inline int unshare_timens(void)
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{
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if (unshare(CLONE_NEWTIME)) {
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if (errno == EPERM)
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ksft_exit_skip("need to run as root\n");
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return pr_perror("Can't unshare() timens");
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}
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return 0;
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}
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static inline int _settime(clockid_t clk_id, time_t offset)
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{
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int fd, len;
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char buf[4096];
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if (clk_id == CLOCK_MONOTONIC_COARSE || clk_id == CLOCK_MONOTONIC_RAW)
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clk_id = CLOCK_MONOTONIC;
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len = snprintf(buf, sizeof(buf), "%d %ld 0", clk_id, offset);
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fd = open("/proc/self/timens_offsets", O_WRONLY);
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if (fd < 0)
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return pr_perror("/proc/self/timens_offsets");
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if (write(fd, buf, len) != len)
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return pr_perror("/proc/self/timens_offsets");
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close(fd);
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return 0;
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}
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static inline int _gettime(clockid_t clk_id, struct timespec *res, bool raw_syscall)
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{
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int err;
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if (!raw_syscall) {
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if (clock_gettime(clk_id, res)) {
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pr_perror("clock_gettime(%d)", (int)clk_id);
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return -1;
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}
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return 0;
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}
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err = syscall(SYS_clock_gettime, clk_id, res);
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if (err)
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pr_perror("syscall(SYS_clock_gettime(%d))", (int)clk_id);
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return err;
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}
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static inline void nscheck(void)
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{
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if (access("/proc/self/ns/time", F_OK) < 0)
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ksft_exit_skip("Time namespaces are not supported\n");
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}
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#endif
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