wait1.c

APUE(第二版)的随书源代码,与第一版的代码相比增加了一些章节的代码(详见第二版的说明)

#include	<sys/types.h>
#include	<sys/wait.h>
#include	"ourhdr.h"

int
main(void)
{
	pid_t	pid;
	int		status;

	if ( (pid = fork()) < 0)
		err_sys("fork error");
	else if (pid == 0)		/* child */
		exit(7);

	if (wait(&status) != pid)		/* wait for child */
		err_sys("wait error");
	pr_exit(status);				/* and print its status */

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

	if (wait(&status) != pid)		/* wait for child */
		err_sys("wait error");
	pr_exit(status);				/* and print its status */

	if ( (pid = fork()) < 0)
		err_sys("fork error");
	else if (pid == 0)		/* child */
		status /= 0;		/* divide by 0 generates SIGFPE */

	if (wait(&status) != pid)		/* wait for child */
		err_sys("wait error");
	pr_exit(status);				/* and print its status */

	exit(0);
}