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From: Adhemerval Zanella <azanella@sourceware.org> To: glibc-cvs@sourceware.org Subject: [glibc/release/2.33/master] misc: Fix tst-select timeout handling (BZ#27648) Date: Tue, 13 Apr 2021 21:03:01 +0000 (GMT) [thread overview] Message-ID: <20210413210301.9ADD23952013@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=3d525dd63926bb28517b3bf452da17fb3c4ee24c commit 3d525dd63926bb28517b3bf452da17fb3c4ee24c Author: Adhemerval Zanella <adhemerval.zanella@linaro.org> Date: Thu Mar 25 16:57:45 2021 -0300 misc: Fix tst-select timeout handling (BZ#27648) Instead of polling the stderr, create two pipes and fork to check if child timeout as expected similar to tst-pselect.c. Also lower the timeout value. Checked on x86_64-linux-gnu. (cherry picked from commit 1b53b5d970c232b48843c778ac4566ff5b566c3b) Diff: --- NEWS | 1 + misc/tst-select.c | 85 +++++++++++++++++++++++++++++++++++-------------------- 2 files changed, 56 insertions(+), 30 deletions(-) diff --git a/NEWS b/NEWS index 6f32249818..4bc898e858 100644 --- a/NEWS +++ b/NEWS @@ -21,6 +21,7 @@ The following bugs are resolved with this release: [27304] pthread_cond_destroy does not pass private flag to futex system calls [27537] test-container: Always copy test-specific support files [27577] elf/ld.so --help doesn't work + [27648] FAIL: misc/tst-select \f Version 2.33 diff --git a/misc/tst-select.c b/misc/tst-select.c index 7c310256c5..5ad057cd51 100644 --- a/misc/tst-select.c +++ b/misc/tst-select.c @@ -16,54 +16,79 @@ License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ -#include <time.h> #include <errno.h> -#include <stdbool.h> -#include <sys/select.h> +#include <support/capture_subprocess.h> #include <support/check.h> -#include <support/xtime.h> #include <support/timespec.h> +#include <support/xunistd.h> +#include <support/xtime.h> -#define TST_SELECT_TIMEOUT 1 -#define TST_SELECT_FD_ERR 2 +struct child_args +{ + int fds[2][2]; + struct timeval tmo; +}; -static int -test_select_timeout (bool zero_tmo) +static void +do_test_child (void *clousure) { - const int fds = TST_SELECT_FD_ERR; - int timeout = TST_SELECT_TIMEOUT; - struct timeval to = { 0, 0 }; - struct timespec ts; - fd_set rfds; + struct child_args *args = (struct child_args *) clousure; - FD_ZERO (&rfds); - FD_SET (fds, &rfds); + close (args->fds[0][1]); + close (args->fds[1][0]); - if (zero_tmo) - timeout = 0; + fd_set rfds; + FD_ZERO (&rfds); + FD_SET (args->fds[0][0], &rfds); - to.tv_sec = timeout; - ts = xclock_now (CLOCK_REALTIME); - ts = timespec_add (ts, (struct timespec) { timeout, 0 }); + struct timespec ts = xclock_now (CLOCK_REALTIME); + ts = timespec_add (ts, (struct timespec) { args->tmo.tv_sec, 0 }); - /* Wait for timeout. */ - int ret = select (fds + 1, &rfds, NULL, NULL, &to); - if (ret == -1) - FAIL_EXIT1 ("select failed: %m\n"); + int r = select (args->fds[0][0] + 1, &rfds, NULL, NULL, &args->tmo); + TEST_COMPARE (r, 0); TEST_TIMESPEC_NOW_OR_AFTER (CLOCK_REALTIME, ts); - return 0; + xwrite (args->fds[1][1], "foo", 3); } static int do_test (void) { - /* Check if select exits immediately. */ - test_select_timeout (true); - - /* Check if select exits after specified timeout. */ - test_select_timeout (false); + struct child_args args; + + xpipe (args.fds[0]); + xpipe (args.fds[1]); + + /* The child select should timeout and write on its pipe end. */ + args.tmo = (struct timeval) { .tv_sec = 0, .tv_usec = 250000 }; + { + struct support_capture_subprocess result; + result = support_capture_subprocess (do_test_child, &args); + support_capture_subprocess_check (&result, "tst-select-child", 0, + sc_allow_none); + } + + /* Same as before, but simulating polling. */ + args.tmo = (struct timeval) { .tv_sec = 0, .tv_usec = 0 }; + { + struct support_capture_subprocess result; + result = support_capture_subprocess (do_test_child, &args); + support_capture_subprocess_check (&result, "tst-select-child", 0, + sc_allow_none); + } + + xclose (args.fds[0][0]); + xclose (args.fds[1][1]); + + { + fd_set rfds; + FD_ZERO (&rfds); + FD_SET (args.fds[1][0], &rfds); + + int r = select (args.fds[1][0] + 1, &rfds, NULL, NULL, &args.tmo); + TEST_COMPARE (r, 1); + } return 0; }
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