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Thu, 08 Jun 2023 03:16:51 -0700 (PDT) Received: from localhost.localdomain ([46.33.96.32]) by smtp.gmail.com with ESMTPSA id e20-20020a170906249400b00977da0f14ffsm506558ejb.171.2023.06.08.03.16.50 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Thu, 08 Jun 2023 03:16:50 -0700 (PDT) From: Michal Sekletar To: jirislaby@kernel.org Cc: arozansk@redhat.com, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, msekleta@redhat.com, shuah@kernel.org Subject: [PATCH v2 2/2] selftests: tty: add selftest for tty timestamp updates Date: Thu, 8 Jun 2023 12:16:16 +0200 Message-Id: <20230608101616.44152-2-msekleta@redhat.com> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230608101616.44152-1-msekleta@redhat.com> References: <20230608101616.44152-1-msekleta@redhat.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Signed-off-by: Michal Sekletar --- tools/testing/selftests/Makefile | 1 + tools/testing/selftests/tty/.gitignore | 2 + tools/testing/selftests/tty/Makefile | 5 ++ .../testing/selftests/tty/tty_tstamp_update.c | 88 +++++++++++++++++++ 4 files changed, 96 insertions(+) create mode 100644 tools/testing/selftests/tty/.gitignore create mode 100644 tools/testing/selftests/tty/Makefile create mode 100644 tools/testing/selftests/tty/tty_tstamp_update.c diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile index 90a62cf75..862f5f9a7 100644 --- a/tools/testing/selftests/Makefile +++ b/tools/testing/selftests/Makefile @@ -86,6 +86,7 @@ TARGETS += timers endif TARGETS += tmpfs TARGETS += tpm2 +TARGETS += tty TARGETS += user TARGETS += vDSO TARGETS += mm diff --git a/tools/testing/selftests/tty/.gitignore b/tools/testing/selftests/tty/.gitignore new file mode 100644 index 000000000..fe70462a4 --- /dev/null +++ b/tools/testing/selftests/tty/.gitignore @@ -0,0 +1,2 @@ +# SPDX-License-Identifier: GPL-2.0-only +tty_tstamp_update diff --git a/tools/testing/selftests/tty/Makefile b/tools/testing/selftests/tty/Makefile new file mode 100644 index 000000000..50d7027b2 --- /dev/null +++ b/tools/testing/selftests/tty/Makefile @@ -0,0 +1,5 @@ +# SPDX-License-Identifier: GPL-2.0 +CFLAGS = -O2 -Wall +TEST_GEN_PROGS := tty_tstamp_update + +include ../lib.mk 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 000000000..0ee97943d --- /dev/null +++ b/tools/testing/selftests/tty/tty_tstamp_update.c @@ -0,0 +1,88 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include +#include +#include +#include +#include +#include +#include +#include + +#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; + + ksft_print_header(); + ksft_set_plan(1); + + r = readlink("/proc/self/fd/0", tty, PATH_MAX); + if (r < 0) + ksft_exit_fail_msg("readlink on /proc/self/fd/0 failed: %m\n"); + + if (!tty_valid(tty)) + ksft_exit_skip("invalid tty path '%s'\n", tty); + + r = stat(tty, &st1); + if (r < 0) + ksft_exit_fail_msg("stat failed on tty path '%s': %m\n", tty); + + /* 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_exit_fail_msg("failed to write to /dev/tty: %s\n", + strerror(-r)); + + r = stat(tty, &st2); + if (r < 0) + ksft_exit_fail_msg("stat failed on tty path '%s': %m\n", tty); + + /* 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_test_result_fail("tty timestamps not updated\n"); + ksft_exit_fail(); + } + + ksft_test_result_pass( + "timestamps of terminal '%s' updated after write to /dev/tty\n", tty); + return EXIT_SUCCESS; +}