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author | Florian Weimer <fweimer@redhat.com> | 2019-05-14 21:35:09 +0200 |
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committer | Florian Weimer <fweimer@redhat.com> | 2019-05-14 22:55:51 +0200 |
commit | 04b261bdc13afd1f7644c756a23df3d43d400fa4 (patch) | |
tree | 760758002560f45d40b8b7d7f2ee377eda509516 /sysdeps/unix/sysv/linux/tst-tgkill.c | |
parent | 6807f47b81bcae3874277f5480683ebeb7dfcf89 (diff) | |
download | glibc-04b261bdc13afd1f7644c756a23df3d43d400fa4.tar.gz glibc-04b261bdc13afd1f7644c756a23df3d43d400fa4.tar.xz glibc-04b261bdc13afd1f7644c756a23df3d43d400fa4.zip |
Linux: Add the tgkill function
The tgkill function is sometimes used in crash handlers. <bits/signal_ext.h> follows the same approach as <bits/unistd_ext.h> (which was added for the gettid system call wrapper). Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Diffstat (limited to 'sysdeps/unix/sysv/linux/tst-tgkill.c')
-rw-r--r-- | sysdeps/unix/sysv/linux/tst-tgkill.c | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/tst-tgkill.c b/sysdeps/unix/sysv/linux/tst-tgkill.c new file mode 100644 index 0000000000..818e2f58da --- /dev/null +++ b/sysdeps/unix/sysv/linux/tst-tgkill.c @@ -0,0 +1,132 @@ +/* Smoke test for the tgkill system call. + Copyright (C) 2019 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#include <errno.h> +#include <signal.h> +#include <support/check.h> +#include <support/namespace.h> +#include <support/xthread.h> +#include <unistd.h> + +/* Number of times sigusr1_handler has been invoked. */ +static volatile sig_atomic_t signals_delivered; + +/* Expected TID of the thread receiving the signal. */ +static pid_t expected_signal_tid; + +static void +sigusr1_handler (int signo) +{ + TEST_COMPARE (expected_signal_tid, gettid ()); + ++signals_delivered; +} + +struct pid_and_tid +{ + pid_t pid; + pid_t tid; +}; + +/* Send signals from the subprocess which are not expected to be + delivered. There is no handler for SIGUSR2, so delivery will + result in a test failure. CLOSURE must point to a valid PID/TID + combination that is still running. */ +static void +subprocess_no_tid_match (void *closure) +{ + struct pid_and_tid *ids = closure; + TEST_COMPARE (tgkill (ids->pid, gettid (), SIGUSR2), -1); + TEST_COMPARE (errno, ESRCH); + + TEST_COMPARE (tgkill (getpid (), ids->tid, SIGUSR2), -1); + TEST_COMPARE (errno, ESRCH); + + TEST_COMPARE (tgkill (getppid (), gettid (), SIGUSR2), -1); + TEST_COMPARE (errno, ESRCH); +} + +/* Called from threadfunc below. */ +static void +subprocess (void *closure) +{ + int original_tid = expected_signal_tid; + + /* Do not expect that the folloing signals are delivered to the + subprocess. The parent process retains the original + expected_signal_tid value. */ + expected_signal_tid = 0; + TEST_COMPARE (tgkill (getpid (), original_tid, SIGUSR1), -1); + TEST_COMPARE (errno, ESRCH); + TEST_COMPARE (tgkill (getppid (), gettid (), SIGUSR1), -1); + TEST_COMPARE (errno, ESRCH); + TEST_COMPARE (expected_signal_tid, 0); + + /* This call has the correct PID/TID combination and is therefore + expected to suceed. */ + TEST_COMPARE (tgkill (getppid (), original_tid, SIGUSR1), 0); +} + +static void * +threadfunc (void *closure) +{ + TEST_VERIFY (gettid () != getpid ()); + expected_signal_tid = gettid (); + TEST_COMPARE (tgkill (getpid (), gettid (), SIGUSR1), 0); + TEST_COMPARE (signals_delivered, 1); + signals_delivered = 0; + + support_isolate_in_subprocess (subprocess, NULL); + + /* Check that exactly one signal arrived from the subprocess. */ + TEST_COMPARE (signals_delivered, 1); + + support_isolate_in_subprocess (subprocess_no_tid_match, + &(struct pid_and_tid) + { + .pid = getpid (), + .tid = gettid (), + }); + + support_isolate_in_subprocess (subprocess_no_tid_match, + &(struct pid_and_tid) + { + .pid = getpid (), + .tid = getpid (), + }); + + return NULL; +} + +static int +do_test (void) +{ + TEST_VERIFY_EXIT (signal (SIGUSR1, sigusr1_handler) != SIG_ERR); + + expected_signal_tid = gettid (); + TEST_COMPARE (gettid (), getpid ()); + TEST_COMPARE (tgkill (getpid (), gettid (), SIGUSR1), 0); + TEST_COMPARE (signals_delivered, 1); + signals_delivered = 0; + + xpthread_join (xpthread_create (NULL, threadfunc, NULL)); + + TEST_VERIFY (signal (SIGUSR1, SIG_DFL) == sigusr1_handler); + return 0; +} + +#include <support/test-driver.c> |