父进程获取子进程退出状态（2）

main.cpp：

#include <unistd.h> #include <iostream> #include <sys/wait.h> #include <stdlib.h> using namespace std; int main() { int ret; ret = fork(); if (ret > 0) { cout << "parent start/n"; int status; pid_t pid; pid = wait(&status); if (pid != ret) { cout << "parent wait error(wait return pid:" << pid << ", fork return pid:" << ret << ")/n"; exit(1); } else { cout << "parent wait return(pid:" << pid << ")/n"; } cout << "parent's child end - pid:"<< pid << ", status:" << status << endl; if (WIFEXITED(status)) { cout << ">> child exited, exit code=" << WEXITSTATUS(status) << endl; if (WEXITSTATUS(status) == 1) { cout << ">> child exec error/n"; } } else if (WIFSIGNALED(status)) { cout << ">> child killed (signal " << WTERMSIG(status) << ")/n"; #ifdef WCOREDUMP } else if (WCOREDUMP(status)) { cout << ">> child core file generated/n"; #endif } else if (WIFSTOPPED(status)) { cout << ">> child stopped (signal " << WSTOPSIG(status) << ")/n"; #ifdef WIFCONTINUED } else if (WIFCONTINUED(status)) { cout << ">> child continued/n"; #endif } else { cout << ">> Unexpected status (" << status << ")/n"; } } else if (ret == 0) { pid_t ppid = getppid(); cout << "child start/n"; cout << "child ppid:" << ppid << endl; cout << "child pid:" << getpid() << endl; cout << "child exec/n"; if (execl ("./child", "child", (char *)0) < 0) { cout << "child exec error/n"; exit(1); } } else { cout << "fork error/n"; } return 0; }

 

 

 

 

child.cpp：（g++ child.cpp -o child）

#include <unistd.h> #include <iostream> using namespace std; int main() { cout << "child exec start/n"; cout << "child exec ppid:" << getppid() << endl; cout << "child exec pid:" << getpid() << endl; sleep(30); return 0; }