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0001 /***************************************************************************** 0002 * Copyright 2014 - 2015 Yichao Yu <yyc1992@gmail.com> * 0003 * * 0004 * This program is free software; you can redistribute it and/or modify * 0005 * it under the terms of the GNU Lesser General Public License as * 0006 * published by the Free Software Foundation; either version 2.1 of the * 0007 * License, or (at your option) version 3, or any later version accepted * 0008 * by the membership of KDE e.V. (or its successor approved by the * 0009 * membership of KDE e.V.), which shall act as a proxy defined in * 0010 * Section 6 of version 3 of the license. * 0011 * * 0012 * This program is distributed in the hope that it will be useful, * 0013 * but WITHOUT ANY WARRANTY; without even the implied warranty of * 0014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * 0015 * Lesser General Public License for more details. * 0016 * * 0017 * You should have received a copy of the GNU Lesser General Public * 0018 * License along with this library. If not, * 0019 * see <http://www.gnu.org/licenses/>. * 0020 *****************************************************************************/ 0021 0022 #include <qtcurve-utils/process.h> 0023 #include <assert.h> 0024 #include <unistd.h> 0025 #include <time.h> 0026 #include <signal.h> 0027 #include <sys/wait.h> 0028 0029 int pipe_fds[2]; 0030 long num; 0031 0032 static void 0033 forkCb(void*) 0034 { 0035 write(pipe_fds[1], &num, sizeof(num)); 0036 } 0037 0038 static void 0039 sigchld_handler(int) 0040 { 0041 wait(nullptr); 0042 } 0043 0044 int 0045 main() 0046 { 0047 int res = pipe(pipe_fds); 0048 assert(res == 0); 0049 srandom(time(nullptr)); 0050 num = random(); 0051 0052 struct sigaction sa; 0053 memset(&sa, 0, sizeof(struct sigaction)); 0054 sa.sa_handler = sigchld_handler; 0055 sigemptyset(&sa.sa_mask); 0056 sa.sa_flags = SA_RESTART; 0057 sigaction(SIGCHLD, &sa, nullptr); 0058 0059 if (fork() == 0) { 0060 sleep(4); 0061 return 0; 0062 } 0063 0064 alarm(1); 0065 bool fork_res = qtcForkBackground(forkCb, nullptr); 0066 assert(fork_res); 0067 long num_sent = 0; 0068 ssize_t read_res = read(pipe_fds[0], &num_sent, sizeof(num_sent)); 0069 assert(read_res == sizeof(num_sent)); 0070 assert(num_sent = num); 0071 return 0; 0072 }