diff options
Diffstat (limited to 'tools/testing/selftests/tty/tty_tstamp_update.c')
-rw-r--r-- | tools/testing/selftests/tty/tty_tstamp_update.c | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/tools/testing/selftests/tty/tty_tstamp_update.c b/tools/testing/selftests/tty/tty_tstamp_update.c new file mode 100644 index 000000000000..9e1a40f5db17 --- /dev/null +++ b/tools/testing/selftests/tty/tty_tstamp_update.c @@ -0,0 +1,106 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <errno.h> +#include <stdbool.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/stat.h> +#include <unistd.h> +#include <linux/limits.h> + +#include "../kselftest.h" + +#define MIN_TTY_PATH_LEN 8 + +static bool tty_valid(char *tty) +{ + if (strlen(tty) < MIN_TTY_PATH_LEN) + return false; + + if (strncmp(tty, "/dev/tty", MIN_TTY_PATH_LEN) == 0 || + strncmp(tty, "/dev/pts", MIN_TTY_PATH_LEN) == 0) + return true; + + return false; +} + +static int write_dev_tty(void) +{ + FILE *f; + int r = 0; + + f = fopen("/dev/tty", "r+"); + if (!f) + return -errno; + + r = fprintf(f, "hello, world!\n"); + if (r != strlen("hello, world!\n")) + r = -EIO; + + fclose(f); + return r; +} + +int main(int argc, char **argv) +{ + int r; + char tty[PATH_MAX] = {}; + struct stat st1, st2; + int result = KSFT_FAIL; + + ksft_print_header(); + ksft_set_plan(1); + + r = readlink("/proc/self/fd/0", tty, PATH_MAX); + if (r < 0) { + ksft_print_msg("readlink on /proc/self/fd/0 failed: %m\n"); + goto out; + } + + if (!tty_valid(tty)) { + ksft_print_msg("invalid tty path '%s'\n", tty); + result = KSFT_SKIP; + goto out; + + } + + r = stat(tty, &st1); + if (r < 0) { + ksft_print_msg("stat failed on tty path '%s': %m\n", tty); + goto out; + } + + /* We need to wait at least 8 seconds in order to observe timestamp change */ + /* https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=fbf47635315ab308c9b58a1ea0906e711a9228de */ + sleep(10); + + r = write_dev_tty(); + if (r < 0) { + ksft_print_msg("failed to write to /dev/tty: %s\n", + strerror(-r)); + goto out; + } + + r = stat(tty, &st2); + if (r < 0) { + ksft_print_msg("stat failed on tty path '%s': %m\n", tty); + goto out; + } + + /* We wrote to the terminal so timestamps should have been updated */ + if (st1.st_atim.tv_sec == st2.st_atim.tv_sec && + st1.st_mtim.tv_sec == st2.st_mtim.tv_sec) { + ksft_print_msg("tty timestamps not updated\n"); + goto out; + } + + ksft_print_msg( + "timestamps of terminal '%s' updated after write to /dev/tty\n", tty); + result = KSFT_PASS; + +out: + ksft_test_result_report(result, "tty_tstamp_update\n"); + + ksft_finished(); +} |