1 /* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include <stdio.h> 18 #include <signal.h> 19 #include <setjmp.h> 20 21 static sigjmp_buf sbuf; 22 23 void handler(int sig) 24 { 25 printf("In handler()\n"); 26 siglongjmp(sbuf, 99); 27 printf("After calling siglongjmp, but you won't see me here.\n"); 28 } 29 30 void foo() 31 { 32 struct sigaction sact; 33 sigset_t sset; 34 printf("In foo()\n"); 35 36 /* Setup signal handler for SIGUSR2 */ 37 sigemptyset(&sact.sa_mask); 38 sact.sa_flags = 0; 39 sact.sa_handler = handler; 40 sigaction(SIGUSR2, &sact, NULL); 41 42 /* Unblock SIGUSR2 */ 43 sigemptyset(&sset); 44 sigaddset(&sset, SIGUSR2); 45 sigprocmask(SIG_UNBLOCK, &sset, NULL); 46 47 /* Action */ 48 kill(getpid(), SIGUSR2); 49 50 printf("After calling kill, but you won't see me here.\n"); 51 } 52 53 void bar() 54 { 55 printf("In bar()\n"); 56 foo(); 57 printf("After calling foo, but you won't see me here.\n"); 58 } 59 60 int main() 61 { 62 int code, ret; 63 sigset_t sset; 64 printf("In main()\n"); 65 sigemptyset(&sset); 66 sigaddset(&sset, SIGUSR1); 67 sigaddset(&sset, SIGUSR2); 68 sigprocmask(SIG_SETMASK, &sset, NULL); 69 if ((code = sigsetjmp(sbuf, 1)) == 0) 70 { 71 bar(); 72 ret = 0xDEADBEEF; 73 } 74 else 75 { 76 printf("siglongjmp() back to main, code = %d\n", code); 77 /* Make sure SIGUSR2 still blocked */ 78 sigprocmask(SIG_SETMASK, NULL, &sset); 79 ret = sigismember(&sset, SIGUSR2)? 0 : -1; 80 } 81 printf("ret = %d\n", ret); 82 83 return ret; 84 } 85
