figc.9

来自「UNIX环境高级编程第二版（英文版）配书的源代码」· 9 代码 · 共 25 行

#include "apue.h"

#ifdef SOLARIS
#define PSCMD	"ps -a -o pid,ppid,s,tty,comm"
#else
#define PSCMD	"ps -o pid,ppid,state,tty,command"
#endif

int
main(void)
{
	pid_t	pid;

	if ((pid = fork()) < 0)
		err_sys("fork error");
	else if (pid == 0)		/* child */
		exit(0);

	/* parent */
	sleep(4);
	system(PSCMD);

	exit(0);
}