diff options
| -rw-r--r-- | posix/Makefile | 3 | ||||
| -rw-r--r-- | posix/tst-wait4.c | 209 |
2 files changed, 211 insertions, 1 deletions
diff --git a/posix/Makefile b/posix/Makefile index 4507d84bf1..605ddbade8 100644 --- a/posix/Makefile +++ b/posix/Makefile @@ -82,7 +82,8 @@ tests := test-errno tstgetopt testfnm runtests runptests \ bug-regex29 bug-regex30 bug-regex31 bug-regex32 \ tst-nice tst-nanosleep tst-regex2 \ transbug tst-rxspencer tst-pcre tst-boost \ - bug-ga1 tst-vfork1 tst-vfork2 tst-vfork3 tst-waitid \ + bug-ga1 tst-vfork1 tst-vfork2 tst-vfork3 \ + tst-waitid tst-wait4 \ tst-getaddrinfo2 bug-glob2 bug-glob3 tst-sysconf \ tst-execvp1 tst-execvp2 tst-execlp1 tst-execlp2 \ tst-execv1 tst-execv2 tst-execl1 tst-execl2 \ diff --git a/posix/tst-wait4.c b/posix/tst-wait4.c new file mode 100644 index 0000000000..5696a3456c --- /dev/null +++ b/posix/tst-wait4.c @@ -0,0 +1,209 @@ +/* Tests for wait4. + Copyright (C) 2020 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 + <https://www.gnu.org/licenses/>. */ + +#include <errno.h> +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <sys/wait.h> +#include <sys/resource.h> +#include <signal.h> +#include <time.h> +#include <stdatomic.h> +#include <stdbool.h> + +#include <support/xsignal.h> +#include <support/xunistd.h> +#include <support/check.h> +#include <support/process_state.h> + +static void +test_child (void) +{ + /* First thing, we stop ourselves. */ + raise (SIGSTOP); + + /* Hey, we got continued! */ + while (1) + pause (); +} + +#ifndef WEXITED +# define WEXITED 0 +# define WCONTINUED 0 +# define WSTOPPED WUNTRACED +#endif + +/* Set with only SIGCHLD on do_test_waitid. */ +static sigset_t chldset; + +#ifdef SA_SIGINFO +static void +sigchld (int signo, siginfo_t *info, void *ctx) +{ +} +#endif + +static void +check_sigchld (int code, int status, pid_t pid) +{ +#ifdef SA_SIGINFO + siginfo_t siginfo; + TEST_COMPARE (sigwaitinfo (&chldset, &siginfo), SIGCHLD); + + TEST_COMPARE (siginfo.si_signo, SIGCHLD); + TEST_COMPARE (siginfo.si_code, code); + TEST_COMPARE (siginfo.si_status, status); + TEST_COMPARE (siginfo.si_pid, pid); +#endif +} + +static int +do_test_wait4 (pid_t pid) +{ + /* Adding process_state_tracing_stop ('t') allows the test to work under + trace programs such as ptrace. */ + enum support_process_state stop_state = support_process_state_stopped + | support_process_state_tracing_stop; + + support_process_state_wait (pid, stop_state); + + check_sigchld (CLD_STOPPED, SIGSTOP, pid); + + pid_t ret; + int wstatus; + struct rusage rusage; + + ret = wait4 (pid, &wstatus, WUNTRACED|WCONTINUED|WNOHANG, NULL); + if (ret == -1 && errno == ENOTSUP) + FAIL_RET ("waitid WNOHANG on stopped: %m"); + TEST_COMPARE (ret, pid); + TEST_VERIFY (WIFSTOPPED (wstatus)); + + /* Issue again but with struct rusage input. */ + ret = wait4 (pid, &wstatus, WUNTRACED|WCONTINUED|WNOHANG, &rusage); + /* With WNOHANG and WUNTRACED, if the children has not changes its state + since previous call the expected result it 0. */ + TEST_COMPARE (ret, 0); + + /* Some sanity tests to check if 'wtatus' and 'rusage' possible + input values. */ + ret = wait4 (pid, NULL, WUNTRACED|WCONTINUED|WNOHANG, &rusage); + TEST_COMPARE (ret, 0); + ret = wait4 (pid, NULL, WUNTRACED|WCONTINUED|WNOHANG, NULL); + TEST_COMPARE (ret, 0); + + if (kill (pid, SIGCONT) != 0) + FAIL_RET ("kill (%d, SIGCONT): %m\n", pid); + + /* Wait for the child to have continued. */ + support_process_state_wait (pid, support_process_state_sleeping); + +#if WCONTINUED != 0 + check_sigchld (CLD_CONTINUED, SIGCONT, pid); + + ret = wait4 (pid, &wstatus, WCONTINUED|WNOHANG, NULL); + TEST_COMPARE (ret, pid); + TEST_VERIFY (WIFCONTINUED (wstatus)); + + /* Issue again but with struct rusage input. */ + ret = wait4 (pid, &wstatus, WUNTRACED|WCONTINUED|WNOHANG, &rusage); + /* With WNOHANG and WUNTRACED, if the children has not changes its state + since previous call the expected result it 0. */ + TEST_COMPARE (ret, 0); + + /* Now stop him again and test waitpid with WCONTINUED. */ + if (kill (pid, SIGSTOP) != 0) + FAIL_RET ("kill (%d, SIGSTOP): %m\n", pid); + + /* Wait the child stop. The waitid call below will block until it has + stopped, but if we are real quick and enter the waitid system call + before the SIGCHLD has been generated, then it will be discarded and + never delivered. */ + support_process_state_wait (pid, stop_state); + + ret = wait4 (pid, &wstatus, WUNTRACED|WNOHANG, &rusage); + TEST_COMPARE (ret, pid); + + check_sigchld (CLD_STOPPED, SIGSTOP, pid); + + if (kill (pid, SIGCONT) != 0) + FAIL_RET ("kill (%d, SIGCONT): %m\n", pid); + + /* Wait for the child to have continued. */ + support_process_state_wait (pid, support_process_state_sleeping); + + check_sigchld (CLD_CONTINUED, SIGCONT, pid); + + ret = wait4 (pid, &wstatus, WCONTINUED|WNOHANG, NULL); + TEST_COMPARE (ret, pid); + TEST_VERIFY (WIFCONTINUED (wstatus)); +#endif + + /* Die, child, die! */ + if (kill (pid, SIGKILL) != 0) + FAIL_RET ("kill (%d, SIGKILL): %m\n", pid); + + support_process_state_wait (pid, support_process_state_zombie); + + ret = wait4 (pid, &wstatus, 0, &rusage); + TEST_COMPARE (ret, pid); + TEST_VERIFY (WIFSIGNALED (wstatus)); + TEST_VERIFY (WTERMSIG (wstatus) == SIGKILL); + + check_sigchld (CLD_KILLED, SIGKILL, pid); + + return 0; +} + +static int +do_test (void) +{ +#ifdef SA_SIGINFO + { + struct sigaction sa; + sa.sa_flags = SA_SIGINFO | SA_RESTART; + sa.sa_sigaction = sigchld; + sigemptyset (&sa.sa_mask); + xsigaction (SIGCHLD, &sa, NULL); + } +#endif + + sigemptyset (&chldset); + sigaddset (&chldset, SIGCHLD); + + /* The SIGCHLD shall has blocked at the time of the call to sigwait; + otherwise, the behavior is undefined. */ + sigprocmask (SIG_BLOCK, &chldset, NULL); + + pid_t pid = xfork (); + if (pid == 0) + { + test_child (); + _exit (127); + } + + do_test_wait4 (pid); + + xsignal (SIGCHLD, SIG_IGN); + kill (pid, SIGKILL); /* Make sure it's dead if we bailed early. */ + + return 0; +} + +#include <support/test-driver.c> |