@@ -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 \
new file mode 100644
@@ -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>