107 lines
2.1 KiB
C
107 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <errno.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <linux/limits.h>
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#include "../kselftest.h"
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#define MIN_TTY_PATH_LEN 8
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static bool tty_valid(char *tty)
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{
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if (strlen(tty) < MIN_TTY_PATH_LEN)
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return false;
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if (strncmp(tty, "/dev/tty", MIN_TTY_PATH_LEN) == 0 ||
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strncmp(tty, "/dev/pts", MIN_TTY_PATH_LEN) == 0)
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return true;
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return false;
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}
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static int write_dev_tty(void)
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{
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FILE *f;
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int r = 0;
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f = fopen("/dev/tty", "r+");
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if (!f)
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return -errno;
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r = fprintf(f, "hello, world!\n");
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if (r != strlen("hello, world!\n"))
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r = -EIO;
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fclose(f);
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return r;
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}
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int main(int argc, char **argv)
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{
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int r;
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char tty[PATH_MAX] = {};
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struct stat st1, st2;
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int result = KSFT_FAIL;
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ksft_print_header();
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ksft_set_plan(1);
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r = readlink("/proc/self/fd/0", tty, PATH_MAX);
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if (r < 0) {
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ksft_print_msg("readlink on /proc/self/fd/0 failed: %m\n");
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goto out;
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}
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if (!tty_valid(tty)) {
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ksft_print_msg("invalid tty path '%s'\n", tty);
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result = KSFT_SKIP;
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goto out;
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}
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r = stat(tty, &st1);
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if (r < 0) {
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ksft_print_msg("stat failed on tty path '%s': %m\n", tty);
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goto out;
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}
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/* We need to wait at least 8 seconds in order to observe timestamp change */
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/* https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=fbf47635315ab308c9b58a1ea0906e711a9228de */
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sleep(10);
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r = write_dev_tty();
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if (r < 0) {
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ksft_print_msg("failed to write to /dev/tty: %s\n",
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strerror(-r));
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goto out;
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}
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r = stat(tty, &st2);
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if (r < 0) {
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ksft_print_msg("stat failed on tty path '%s': %m\n", tty);
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goto out;
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}
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/* We wrote to the terminal so timestamps should have been updated */
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if (st1.st_atim.tv_sec == st2.st_atim.tv_sec &&
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st1.st_mtim.tv_sec == st2.st_mtim.tv_sec) {
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ksft_print_msg("tty timestamps not updated\n");
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goto out;
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}
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ksft_print_msg(
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"timestamps of terminal '%s' updated after write to /dev/tty\n", tty);
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result = KSFT_PASS;
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out:
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ksft_test_result_report(result, "tty_tstamp_update\n");
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ksft_finished();
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}
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