1/* 2* Copyright (c) International Business Machines Corp., 2007 3* This program is free software; you can redistribute it and/or modify 4* it under the terms of the GNU General Public License as published by 5* the Free Software Foundation; either version 2 of the License, or 6* (at your option) any later version. 7* This program is distributed in the hope that it will be useful, 8* but WITHOUT ANY WARRANTY; without even the implied warranty of 9* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 10* the GNU General Public License for more details. 11* You should have received a copy of the GNU General Public License 12* along with this program; if not, write to the Free Software 13* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 14* 15*************************************************************************** 16* File: pidns20.c 17* * 18* * Description: 19* * The pidns20.c testcase verifies that signal handler of SIGUSR1 is called 20* * (and cinit is NOT terminated) when: 21* * - container-init blocks SIGUSR1, 22* * - parent queues SIGUSR1 and 23* * - a handler is specified for SIGUSR1 before it is unblocked. 24* * 25* * Test Assertion & Strategy: 26* * Create a PID namespace container. 27* * Block SIGUSR1 signal inside it. 28* * Let parent to deliver SIGUSR1 signal to container. 29* * Redefine SIGUSR1 handler of cinit to user function. 30* * Unblock SIGUSR1 from blocked queue. 31* * Check if user function is called. 32* * 33* * Usage: <for command-line> 34* * pidns20 35* * 36* * History: 37* * DATE NAME DESCRIPTION 38* * 13/11/08 Gowrishankar M Creation of this test. 39* * <gowrishankar.m@in.ibm.com> 40* 41******************************************************************************/ 42#define _GNU_SOURCE 1 43#include <sys/wait.h> 44#include <sys/types.h> 45#include <signal.h> 46#include <stdlib.h> 47#include <unistd.h> 48#include <stdio.h> 49#include "pidns_helper.h" 50#include "test.h" 51 52char *TCID = "pidns20"; 53int TST_TOTAL = 1; 54 55int parent_cinit[2]; 56int cinit_parent[2]; 57int broken = 1; /* broken should be 0 when test completes properly */ 58 59#define CHILD_PID 1 60#define PARENT_PID 0 61 62/* 63 * child_signal_handler() - to handle SIGUSR1 64 */ 65static void child_signal_handler(int sig, siginfo_t * si, void *unused) 66{ 67 if (si->si_signo != SIGUSR1) 68 tst_resm(TBROK, "cinit: recieved %s unexpectedly!", 69 strsignal(si->si_signo)); 70 else 71 tst_resm(TPASS, "cinit: user function is called as expected"); 72 73 /* Disable broken flag */ 74 broken = 0; 75} 76 77/* 78 * child_fn() - Inside container 79 */ 80int child_fn(void *arg) 81{ 82 pid_t pid, ppid; 83 sigset_t newset; 84 struct sigaction sa; 85 char buf[5]; 86 87 /* Setup pipe read and write ends */ 88 pid = getpid(); 89 ppid = getppid(); 90 91 if (pid != CHILD_PID || ppid != PARENT_PID) { 92 printf("cinit: pidns was not created properly\n"); 93 exit(1); 94 } 95 96 /* Setup pipes to communicate with parent */ 97 close(cinit_parent[0]); 98 close(parent_cinit[1]); 99 100 /* Block SIGUSR1 signal */ 101 sigemptyset(&newset); 102 sigaddset(&newset, SIGUSR1); 103 if (sigprocmask(SIG_BLOCK, &newset, 0) == -1) { 104 perror("cinit: sigprocmask() failed"); 105 exit(1); 106 } 107 tst_resm(TINFO, "cinit: blocked SIGUSR1"); 108 109 /* Let parent to queue SIGUSR1 in pending */ 110 if (write(cinit_parent[1], "c:go", 5) != 5) { 111 perror("cinit: pipe is broken to write"); 112 exit(1); 113 } 114 115 /* Check if parent has queued up SIGUSR1 */ 116 read(parent_cinit[0], buf, 5); 117 if (strcmp(buf, "p:go") != 0) { 118 printf("cinit: parent did not respond!\n"); 119 exit(1); 120 } 121 122 /* Now redefine handler for SIGUSR1 */ 123 sa.sa_flags = SA_SIGINFO; 124 sigfillset(&sa.sa_mask); 125 sa.sa_sigaction = child_signal_handler; 126 if (sigaction(SIGUSR1, &sa, NULL) == -1) { 127 perror("cinit: sigaction failed"); 128 exit(1); 129 } 130 131 /* Unblock traffic on SIGUSR1 queue */ 132 tst_resm(TINFO, "cinit: unblocking SIGUSR1"); 133 sigprocmask(SIG_UNBLOCK, &newset, 0); 134 135 /* Check if new handler is called */ 136 if (broken == 1) { 137 printf("cinit: broken flag didn't change\n"); 138 exit(1); 139 } 140 141 /* Cleanup and exit */ 142 close(cinit_parent[1]); 143 close(parent_cinit[0]); 144 exit(0); 145} 146 147static void setup(void) 148{ 149 tst_require_root(); 150 check_newpid(); 151} 152 153int main(int argc, char *argv[]) 154{ 155 int status; 156 char buf[5]; 157 pid_t cpid; 158 159 setup(); 160 161 /* Create pipes for intercommunication */ 162 if (pipe(parent_cinit) == -1 || pipe(cinit_parent) == -1) { 163 tst_brkm(TBROK | TERRNO, NULL, "pipe failed"); 164 } 165 166 cpid = ltp_clone_quick(CLONE_NEWPID | SIGCHLD, child_fn, NULL); 167 if (cpid == -1) { 168 tst_brkm(TBROK | TERRNO, NULL, "clone failed"); 169 } 170 171 /* Setup pipe read and write ends */ 172 close(cinit_parent[1]); 173 close(parent_cinit[0]); 174 175 /* Is container ready */ 176 read(cinit_parent[0], buf, 5); 177 if (strcmp(buf, "c:go") != 0) { 178 tst_brkm(TBROK, NULL, "parent: container did not respond!"); 179 } 180 181 /* Enqueue SIGUSR1 in pending signal queue of container */ 182 if (kill(cpid, SIGUSR1) == -1) { 183 tst_brkm(TBROK | TERRNO, NULL, "kill() failed"); 184 } 185 186 tst_resm(TINFO, "parent: signalled SIGUSR1 to container"); 187 if (write(parent_cinit[1], "p:go", 5) != 5) { 188 tst_brkm(TBROK | TERRNO, NULL, "write failed"); 189 } 190 191 /* collect exit status of child */ 192 if (wait(&status) == -1) { 193 tst_brkm(TBROK | TERRNO, NULL, "wait failed"); 194 } 195 196 if (WIFSIGNALED(status)) { 197 if (WTERMSIG(status) == SIGUSR1) 198 tst_resm(TFAIL, 199 "user function was not called inside cinit"); 200 else 201 tst_resm(TBROK, 202 "cinit was terminated by %d", 203 WTERMSIG(status)); 204 } 205 206 /* Cleanup and exit */ 207 close(parent_cinit[1]); 208 close(cinit_parent[0]); 209 tst_exit(); 210} 211