70 lines
1.7 KiB
C
70 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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Copyright (c) 2020 Cyril Hrubis <chrubis@suse.cz>
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*/
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/*
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Basic test for timens_offsets error handling.
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After a call to unshare(CLONE_NEWTIME) a new timer namespace is created, the
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process that has called the unshare() can adjust offsets for CLOCK_MONOTONIC
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and CLOCK_BOOTTIME for its children by writing to the '/proc/self/timens_offsets'.
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*/
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#define _GNU_SOURCE
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#include "lapi/namespaces_constants.h"
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#include "lapi/posix_clocks.h"
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#include "tst_test.h"
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static struct tcase {
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const char *desc;
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const char *offsets;
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int exp_err;
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} tcases[] = {
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{"Obvious garbage", "not an offset", EINVAL},
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{"Missing nanoseconds", "1 10", EINVAL},
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{"Negative nanoseconds", "1 10 -10", EINVAL},
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{"Nanoseconds > 1s", "1 10 1000000001", EINVAL},
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{"Unsupported CLOCK_REALTIME", "0 10 0", EINVAL},
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{"Mess on the second line", "1 10 0\na", EINVAL},
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{"Overflow kernel 64bit ns timer", "1 9223372036 0", ERANGE},
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{"Overflow kernel 64bit ns timer", "1 -9223372036 0", ERANGE},
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};
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static void verify_ns_clock(unsigned int n)
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{
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struct tcase *tc = &tcases[n];
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int fd, ret;
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SAFE_UNSHARE(CLONE_NEWTIME);
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fd = SAFE_OPEN("/proc/self/timens_offsets", O_WRONLY);
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ret = write(fd, tc->offsets, strlen(tc->offsets));
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if (ret != -1) {
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tst_res(TFAIL, "%s returned %i", tc->desc, ret);
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return;
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}
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if (errno != tc->exp_err) {
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tst_res(TFAIL | TERRNO, "%s should fail with %s, got:",
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tc->desc, tst_strerrno(tc->exp_err));
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return;
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}
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tst_res(TPASS | TERRNO, "%s", tc->desc);
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}
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static struct tst_test test = {
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.tcnt = ARRAY_SIZE(tcases),
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.test = verify_ns_clock,
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.needs_root = 1,
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.needs_kconfigs = (const char *[]) {
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"CONFIG_TIME_NS=y",
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NULL
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}
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};
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