| /* Tests for waitid. |
| Copyright (C) 2004-2018 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 <stdio.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <sys/wait.h> |
| #include <signal.h> |
| |
| #define TIMEOUT 15 |
| |
| static void |
| test_child (void) |
| { |
| /* Wait a second to be sure the parent set his variables before we |
| produce a SIGCHLD. */ |
| sleep (1); |
| |
| /* 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 |
| |
| static sig_atomic_t expecting_sigchld, spurious_sigchld; |
| #ifdef SA_SIGINFO |
| static siginfo_t sigchld_info; |
| |
| static void |
| sigchld (int signo, siginfo_t *info, void *ctx) |
| { |
| if (signo != SIGCHLD) |
| { |
| printf ("SIGCHLD handler got signal %d instead!\n", signo); |
| _exit (EXIT_FAILURE); |
| } |
| |
| if (! expecting_sigchld) |
| { |
| spurious_sigchld = 1; |
| printf ("spurious SIGCHLD: signo %d code %d status %d pid %d\n", |
| info->si_signo, info->si_code, info->si_status, info->si_pid); |
| } |
| else |
| { |
| sigchld_info = *info; |
| expecting_sigchld = 0; |
| } |
| } |
| |
| static void |
| check_sigchld (const char *phase, int *ok, int code, int status, pid_t pid) |
| { |
| if (expecting_sigchld) |
| { |
| printf ("missing SIGCHLD on %s\n", phase); |
| *ok = EXIT_FAILURE; |
| expecting_sigchld = 0; |
| return; |
| } |
| |
| if (sigchld_info.si_signo != SIGCHLD) |
| { |
| printf ("SIGCHLD for %s signal %d\n", phase, sigchld_info.si_signo); |
| *ok = EXIT_FAILURE; |
| } |
| if (sigchld_info.si_code != code) |
| { |
| printf ("SIGCHLD for %s code %d\n", phase, sigchld_info.si_code); |
| *ok = EXIT_FAILURE; |
| } |
| if (sigchld_info.si_status != status) |
| { |
| printf ("SIGCHLD for %s status %d\n", phase, sigchld_info.si_status); |
| *ok = EXIT_FAILURE; |
| } |
| if (sigchld_info.si_pid != pid) |
| { |
| printf ("SIGCHLD for %s pid %d\n", phase, sigchld_info.si_pid); |
| *ok = EXIT_FAILURE; |
| } |
| } |
| # define CHECK_SIGCHLD(phase, code_check, status_check) \ |
| check_sigchld ((phase), &status, (code_check), (status_check), pid) |
| #else |
| # define CHECK_SIGCHLD(phase, code, status) ((void) 0) |
| #endif |
| |
| static int |
| do_test (int argc, char *argv[]) |
| { |
| #ifdef SA_SIGINFO |
| struct sigaction sa; |
| sa.sa_flags = SA_SIGINFO|SA_RESTART; |
| sa.sa_sigaction = &sigchld; |
| if (sigemptyset (&sa.sa_mask) < 0 || sigaction (SIGCHLD, &sa, NULL) < 0) |
| { |
| printf ("setting SIGCHLD handler: %m\n"); |
| return EXIT_FAILURE; |
| } |
| #endif |
| |
| expecting_sigchld = 1; |
| |
| pid_t pid = fork (); |
| if (pid < 0) |
| { |
| printf ("fork: %m\n"); |
| return EXIT_FAILURE; |
| } |
| else if (pid == 0) |
| { |
| test_child (); |
| _exit (127); |
| } |
| |
| int status = EXIT_SUCCESS; |
| #define RETURN(ok) \ |
| do { if (status == EXIT_SUCCESS) status = (ok); goto out; } while (0) |
| |
| /* Give the child a chance to stop. */ |
| sleep (3); |
| |
| CHECK_SIGCHLD ("stopped (before waitid)", CLD_STOPPED, SIGSTOP); |
| |
| /* Now try a wait that should not succeed. */ |
| siginfo_t info; |
| info.si_signo = 0; /* A successful call sets it to SIGCHLD. */ |
| int fail = waitid (P_PID, pid, &info, WEXITED|WCONTINUED|WNOHANG); |
| switch (fail) |
| { |
| default: |
| printf ("waitid returned bogus value %d\n", fail); |
| RETURN (EXIT_FAILURE); |
| case -1: |
| printf ("waitid WNOHANG on stopped: %m\n"); |
| RETURN (errno == ENOTSUP ? EXIT_SUCCESS : EXIT_FAILURE); |
| case 0: |
| if (info.si_signo == 0) |
| break; |
| if (info.si_signo == SIGCHLD) |
| printf ("waitid WNOHANG on stopped status %d\n", info.si_status); |
| else |
| printf ("waitid WNOHANG on stopped signal %d\n", info.si_signo); |
| RETURN (EXIT_FAILURE); |
| } |
| |
| /* Next the wait that should succeed right away. */ |
| info.si_signo = 0; /* A successful call sets it to SIGCHLD. */ |
| info.si_pid = -1; |
| info.si_status = -1; |
| fail = waitid (P_PID, pid, &info, WSTOPPED|WNOHANG); |
| switch (fail) |
| { |
| default: |
| printf ("waitid WSTOPPED|WNOHANG returned bogus value %d\n", fail); |
| RETURN (EXIT_FAILURE); |
| case -1: |
| printf ("waitid WSTOPPED|WNOHANG on stopped: %m\n"); |
| RETURN (errno == ENOTSUP ? EXIT_SUCCESS : EXIT_FAILURE); |
| case 0: |
| if (info.si_signo != SIGCHLD) |
| { |
| printf ("waitid WSTOPPED|WNOHANG on stopped signal %d\n", |
| info.si_signo); |
| RETURN (EXIT_FAILURE); |
| } |
| if (info.si_code != CLD_STOPPED) |
| { |
| printf ("waitid WSTOPPED|WNOHANG on stopped code %d\n", |
| info.si_code); |
| RETURN (EXIT_FAILURE); |
| } |
| if (info.si_status != SIGSTOP) |
| { |
| printf ("waitid WSTOPPED|WNOHANG on stopped status %d\n", |
| info.si_status); |
| RETURN (EXIT_FAILURE); |
| } |
| if (info.si_pid != pid) |
| { |
| printf ("waitid WSTOPPED|WNOHANG on stopped pid %d != %d\n", |
| info.si_pid, pid); |
| RETURN (EXIT_FAILURE); |
| } |
| } |
| |
| expecting_sigchld = WCONTINUED != 0; |
| |
| if (kill (pid, SIGCONT) != 0) |
| { |
| printf ("kill (%d, SIGCONT): %m\n", pid); |
| RETURN (EXIT_FAILURE); |
| } |
| |
| /* Wait for the child to have continued. */ |
| sleep (2); |
| |
| #if WCONTINUED != 0 |
| if (expecting_sigchld) |
| { |
| printf ("no SIGCHLD seen for SIGCONT (optional)\n"); |
| expecting_sigchld = 0; |
| } |
| else |
| CHECK_SIGCHLD ("continued (before waitid)", CLD_CONTINUED, SIGCONT); |
| |
| info.si_signo = 0; /* A successful call sets it to SIGCHLD. */ |
| info.si_pid = -1; |
| info.si_status = -1; |
| fail = waitid (P_PID, pid, &info, WCONTINUED|WNOWAIT); |
| switch (fail) |
| { |
| default: |
| printf ("waitid WCONTINUED|WNOWAIT returned bogus value %d\n", fail); |
| RETURN (EXIT_FAILURE); |
| case -1: |
| printf ("waitid WCONTINUED|WNOWAIT on continued: %m\n"); |
| RETURN (errno == ENOTSUP ? EXIT_SUCCESS : EXIT_FAILURE); |
| case 0: |
| if (info.si_signo != SIGCHLD) |
| { |
| printf ("waitid WCONTINUED|WNOWAIT on continued signal %d\n", |
| info.si_signo); |
| RETURN (EXIT_FAILURE); |
| } |
| if (info.si_code != CLD_CONTINUED) |
| { |
| printf ("waitid WCONTINUED|WNOWAIT on continued code %d\n", |
| info.si_code); |
| RETURN (EXIT_FAILURE); |
| } |
| if (info.si_status != SIGCONT) |
| { |
| printf ("waitid WCONTINUED|WNOWAIT on continued status %d\n", |
| info.si_status); |
| RETURN (EXIT_FAILURE); |
| } |
| if (info.si_pid != pid) |
| { |
| printf ("waitid WCONTINUED|WNOWAIT on continued pid %d != %d\n", |
| info.si_pid, pid); |
| RETURN (EXIT_FAILURE); |
| } |
| } |
| |
| /* That should leave the CLD_CONTINUED state waiting to be seen again. */ |
| info.si_signo = 0; /* A successful call sets it to SIGCHLD. */ |
| info.si_pid = -1; |
| info.si_status = -1; |
| fail = waitid (P_PID, pid, &info, WCONTINUED); |
| switch (fail) |
| { |
| default: |
| printf ("waitid WCONTINUED returned bogus value %d\n", fail); |
| RETURN (EXIT_FAILURE); |
| case -1: |
| printf ("waitid WCONTINUED on continued: %m\n"); |
| RETURN (errno == ENOTSUP ? EXIT_SUCCESS : EXIT_FAILURE); |
| case 0: |
| if (info.si_signo != SIGCHLD) |
| { |
| printf ("waitid WCONTINUED on continued signal %d\n", info.si_signo); |
| RETURN (EXIT_FAILURE); |
| } |
| if (info.si_code != CLD_CONTINUED) |
| { |
| printf ("waitid WCONTINUED on continued code %d\n", info.si_code); |
| RETURN (EXIT_FAILURE); |
| } |
| if (info.si_status != SIGCONT) |
| { |
| printf ("waitid WCONTINUED on continued status %d\n", |
| info.si_status); |
| RETURN (EXIT_FAILURE); |
| } |
| if (info.si_pid != pid) |
| { |
| printf ("waitid WCONTINUED on continued pid %d != %d\n", |
| info.si_pid, pid); |
| RETURN (EXIT_FAILURE); |
| } |
| } |
| |
| /* Now try a wait that should not succeed. */ |
| info.si_signo = 0; /* A successful call sets it to SIGCHLD. */ |
| fail = waitid (P_PID, pid, &info, WCONTINUED|WNOHANG); |
| switch (fail) |
| { |
| default: |
| printf ("waitid returned bogus value %d\n", fail); |
| RETURN (EXIT_FAILURE); |
| case -1: |
| printf ("waitid WCONTINUED|WNOHANG on waited continued: %m\n"); |
| RETURN (errno == ENOTSUP ? EXIT_SUCCESS : EXIT_FAILURE); |
| case 0: |
| if (info.si_signo == 0) |
| break; |
| if (info.si_signo == SIGCHLD) |
| printf ("waitid WCONTINUED|WNOHANG on waited continued status %d\n", |
| info.si_status); |
| else |
| printf ("waitid WCONTINUED|WNOHANG on waited continued signal %d\n", |
| info.si_signo); |
| RETURN (EXIT_FAILURE); |
| } |
| |
| /* Now stop him again and test waitpid with WCONTINUED. */ |
| expecting_sigchld = 1; |
| if (kill (pid, SIGSTOP) != 0) |
| { |
| printf ("kill (%d, SIGSTOP): %m\n", pid); |
| RETURN (EXIT_FAILURE); |
| } |
| |
| /* Give the child a chance to stop. The waitpid call below will block |
| until it has stopped, but if we are real quick and enter the waitpid |
| system call before the SIGCHLD has been generated, then it will be |
| discarded and never delivered. */ |
| sleep (3); |
| |
| pid_t wpid = waitpid (pid, &fail, WUNTRACED); |
| if (wpid < 0) |
| { |
| printf ("waitpid WUNTRACED on stopped: %m\n"); |
| RETURN (EXIT_FAILURE); |
| } |
| else if (wpid != pid) |
| { |
| printf ("waitpid WUNTRACED on stopped returned %d != %d (status %x)\n", |
| wpid, pid, fail); |
| RETURN (EXIT_FAILURE); |
| } |
| else if (!WIFSTOPPED (fail) || WIFSIGNALED (fail) || WIFEXITED (fail) |
| || WIFCONTINUED (fail) || WSTOPSIG (fail) != SIGSTOP) |
| { |
| printf ("waitpid WUNTRACED on stopped: status %x\n", fail); |
| RETURN (EXIT_FAILURE); |
| } |
| CHECK_SIGCHLD ("stopped (after waitpid)", CLD_STOPPED, SIGSTOP); |
| |
| expecting_sigchld = 1; |
| if (kill (pid, SIGCONT) != 0) |
| { |
| printf ("kill (%d, SIGCONT): %m\n", pid); |
| RETURN (EXIT_FAILURE); |
| } |
| |
| /* Wait for the child to have continued. */ |
| sleep (2); |
| |
| if (expecting_sigchld) |
| { |
| printf ("no SIGCHLD seen for SIGCONT (optional)\n"); |
| expecting_sigchld = 0; |
| } |
| else |
| CHECK_SIGCHLD ("continued (before waitpid)", CLD_CONTINUED, SIGCONT); |
| |
| wpid = waitpid (pid, &fail, WCONTINUED); |
| if (wpid < 0) |
| { |
| if (errno == EINVAL) |
| printf ("waitpid does not support WCONTINUED\n"); |
| else |
| { |
| printf ("waitpid WCONTINUED on continued: %m\n"); |
| RETURN (EXIT_FAILURE); |
| } |
| } |
| else if (wpid != pid) |
| { |
| printf ("\ |
| waitpid WCONTINUED on continued returned %d != %d (status %x)\n", |
| wpid, pid, fail); |
| RETURN (EXIT_FAILURE); |
| } |
| else if (WIFSTOPPED (fail) || WIFSIGNALED (fail) || WIFEXITED (fail) |
| || !WIFCONTINUED (fail)) |
| { |
| printf ("waitpid WCONTINUED on continued: status %x\n", fail); |
| RETURN (EXIT_FAILURE); |
| } |
| #endif |
| |
| expecting_sigchld = 1; |
| |
| /* Die, child, die! */ |
| if (kill (pid, SIGKILL) != 0) |
| { |
| printf ("kill (%d, SIGKILL): %m\n", pid); |
| RETURN (EXIT_FAILURE); |
| } |
| |
| #ifdef WNOWAIT |
| info.si_signo = 0; /* A successful call sets it to SIGCHLD. */ |
| info.si_pid = -1; |
| info.si_status = -1; |
| fail = waitid (P_PID, pid, &info, WEXITED|WNOWAIT); |
| switch (fail) |
| { |
| default: |
| printf ("waitid WNOWAIT returned bogus value %d\n", fail); |
| RETURN (EXIT_FAILURE); |
| case -1: |
| printf ("waitid WNOWAIT on killed: %m\n"); |
| RETURN (errno == ENOTSUP ? EXIT_SUCCESS : EXIT_FAILURE); |
| case 0: |
| if (info.si_signo != SIGCHLD) |
| { |
| printf ("waitid WNOWAIT on killed signal %d\n", info.si_signo); |
| RETURN (EXIT_FAILURE); |
| } |
| if (info.si_code != CLD_KILLED) |
| { |
| printf ("waitid WNOWAIT on killed code %d\n", info.si_code); |
| RETURN (EXIT_FAILURE); |
| } |
| if (info.si_status != SIGKILL) |
| { |
| printf ("waitid WNOWAIT on killed status %d\n", info.si_status); |
| RETURN (EXIT_FAILURE); |
| } |
| if (info.si_pid != pid) |
| { |
| printf ("waitid WNOWAIT on killed pid %d != %d\n", info.si_pid, pid); |
| RETURN (EXIT_FAILURE); |
| } |
| } |
| #else |
| /* Allow enough time to be sure the child died; we didn't synchronize. */ |
| sleep (2); |
| #endif |
| |
| CHECK_SIGCHLD ("killed", CLD_KILLED, SIGKILL); |
| |
| info.si_signo = 0; /* A successful call sets it to SIGCHLD. */ |
| info.si_pid = -1; |
| info.si_status = -1; |
| fail = waitid (P_PID, pid, &info, WEXITED|WNOHANG); |
| switch (fail) |
| { |
| default: |
| printf ("waitid WNOHANG returned bogus value %d\n", fail); |
| RETURN (EXIT_FAILURE); |
| case -1: |
| printf ("waitid WNOHANG on killed: %m\n"); |
| RETURN (EXIT_FAILURE); |
| case 0: |
| if (info.si_signo != SIGCHLD) |
| { |
| printf ("waitid WNOHANG on killed signal %d\n", info.si_signo); |
| RETURN (EXIT_FAILURE); |
| } |
| if (info.si_code != CLD_KILLED) |
| { |
| printf ("waitid WNOHANG on killed code %d\n", info.si_code); |
| RETURN (EXIT_FAILURE); |
| } |
| if (info.si_status != SIGKILL) |
| { |
| printf ("waitid WNOHANG on killed status %d\n", info.si_status); |
| RETURN (EXIT_FAILURE); |
| } |
| if (info.si_pid != pid) |
| { |
| printf ("waitid WNOHANG on killed pid %d != %d\n", info.si_pid, pid); |
| RETURN (EXIT_FAILURE); |
| } |
| } |
| |
| fail = waitid (P_PID, pid, &info, WEXITED); |
| if (fail == -1) |
| { |
| if (errno != ECHILD) |
| { |
| printf ("waitid WEXITED on killed: %m\n"); |
| RETURN (EXIT_FAILURE); |
| } |
| } |
| else |
| { |
| printf ("waitid WEXITED returned bogus value %d\n", fail); |
| RETURN (EXIT_FAILURE); |
| } |
| |
| #undef RETURN |
| out: |
| if (spurious_sigchld) |
| status = EXIT_FAILURE; |
| signal (SIGCHLD, SIG_IGN); |
| kill (pid, SIGKILL); /* Make sure it's dead if we bailed early. */ |
| return status; |
| } |
| |
| #include "../test-skeleton.c" |