linux 获取子进程,Linux fork 后 wait 获取子进程结束的状态示例

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：

#include

#include

#include

#include

#include

int 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");

// 4种测试情况

exit(7); // -> normal termination, exitstatus = 7

// abort(); // -> abnormal termination, signalstatus = 6 (SIGABRT)

// int i = 1 / 0; // -> abnormal termination, signalstatus = 8 (SIGFPE)

// char *p = NULL; *p = ‘a‘; // -> abnormal termination, signalstatus = 11 (SIGSEGV)

}

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 WCOREDUMP

WCOREDUMP(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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时间： 06-29