使用 fork 后，可能需要获取 fork 的进程的运行状况，，比如有没有异常、崩溃。wait 在 man 中关键的描述如下：All of these system calls are used to wait for state changes in a child of the calling process, and obtain information about the child whose state has changed. A state change is considered to be: the child terminated; the child was stopped by a signal; or the child was resumed by a signal.
示例代码：
<unistd.h>main(void){pid_t pid;int status;printf("before fork\n");fflush(stdout);if ( (pid = fork()) < 0){printf("fork error\n");}else if (pid == 0){printf("after fork, child\n");}wait(&status);if (WIFEXITED(status)){printf("normal termination, exitstatus = %d\n", WEXITSTATUS(status));}else if (WIFSIGNALED(status)){printf("abnormal termination, signalstatus = %d\n", WTERMSIG(status), #ifdef WCOREDUMPWCOREDUMP(status)?"(core file generated)":""); #else "");#endif}else if (WIFSTOPPED(status)){printf("child stopped, signal number = %d\n", WSTOPSIG(status));}printf("after fork, parent\n");return 0;}
运行效果：
wait status
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