/* * Copyright (c) International Business Machines Corp., 2007 * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * This program 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 General Public License for more details. * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * *************************************************************************** * File: pidns12.c * * * * Description: * * The pidns12.c testcase verifies that siginfo->si_pid is set to 0 * * if sender (parent process) is not in receiver's namespace. * * * * Test Assertion & Strategy: * * Create a PID namespace container. * * Initialise signal handler for SIGUSR1 in container. * * Let parent send SIGUSR1 to container. * * Check if sender pid is set to 0 from signal info. * * * * Usage: <for command-line> * * pidns12 * * * * History: * * DATE NAME DESCRIPTION * * 13/11/08 Gowrishankar M Creation of this test. * * <gowrishankar.m@in.ibm.com> * ******************************************************************************/ #define _GNU_SOURCE 1 #include <sys/wait.h> #include <sys/types.h> #include <signal.h> #include <string.h> #include <stdlib.h> #include <unistd.h> #include <stdio.h> #include "pidns_helper.h" #include "test.h" char *TCID = "pidns12"; int TST_TOTAL = 1; int pipefd[2]; #define CHILD_PID 1 #define PARENT_PID 0 /* * child_signal_handler() - dummy function for sigaction() */ static void child_signal_handler(int sig, siginfo_t * si, void *unused) { /* Recieved SIGUSR1. Check sender pid */ if (si->si_pid == 0) tst_resm(TPASS, "cinit: signalling PID (from other namespace)" " is 0 as expected"); else tst_resm(TFAIL, "cinit: signalling PID (from other namespace)" " is not 0, but %d.", si->si_pid); } /* * child_fn() - Inside container */ int child_fn(void *arg) { struct sigaction sa; pid_t pid, ppid; /* Set process id and parent pid */ pid = getpid(); ppid = getppid(); if (pid != CHILD_PID || ppid != PARENT_PID) { tst_resm(TBROK, "cinit: pidns is not created."); } /* Close read end of pipe */ close(pipefd[0]); /* Set signal handler for SIGUSR1 */ sa.sa_flags = SA_SIGINFO; sigfillset(&sa.sa_mask); sa.sa_sigaction = child_signal_handler; if (sigaction(SIGUSR1, &sa, NULL) == -1) { tst_resm(TBROK, "cinit: sigaction() failed(%s).", strerror(errno)); } /* Let parent to signal SIGUSR1 */ if (write(pipefd[1], "c:go\0", 5) != 5) { tst_resm(TBROK, "cinit: pipe is broken to write"); } sleep(3); /* cleanup and exit */ close(pipefd[1]); /* Control won't reach below */ exit(0); } static void setup(void) { tst_require_root(); check_newpid(); } /*********************************************************************** * M A I N ***********************************************************************/ int main(int argc, char *argv[]) { int status; pid_t pid, cpid; char buf[5]; setup(); pid = getpid(); tst_resm(TINFO, "parent: PID is %d", pid); /* Create pipe for intercommunication */ if (pipe(pipefd) == -1) { tst_resm(TBROK, "parent: pipe() failed. aborting!"); } cpid = ltp_clone_quick(CLONE_NEWPID | SIGCHLD, child_fn, NULL); if (cpid < 0) { tst_resm(TBROK, "parent: clone() failed(%s).", strerror(errno)); } /* Close write end of pipe */ close(pipefd[1]); /* Check if container is ready */ read(pipefd[0], buf, 5); if (strcmp(buf, "c:go") != 0) { tst_resm(TBROK, "parent: container did not respond!"); } /* Send SIGUSR1 to container init */ if (kill(cpid, SIGUSR1) == -1) { tst_resm(TBROK, "parent: kill() failed(%s).", strerror(errno)); } if (waitpid(cpid, &status, 0) < 0) tst_resm(TWARN, "parent: waitpid() failed(%s).", strerror(errno)); if (WIFSIGNALED(status) && WTERMSIG(status)) tst_resm(TBROK, "child is terminated by signal(%s)", strsignal(WTERMSIG(status))); /* Cleanup and exit */ close(pipefd[0]); /* Control won't reach below */ exit(0); }