tellwait2.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	"ourhdr.h"

static void charatatime(char *);

int
main(void)
{
	pid_t	pid;

	TELL_WAIT();

	if ( (pid = fork()) < 0)
		err_sys("fork error");
	else if (pid == 0) {
		WAIT_PARENT();		/* parent goes first */
		charatatime("output from child\n");
	} else {
		charatatime("output from parent\n");
		TELL_CHILD(pid);
	}
	exit(0);
}

static void
charatatime(char *str)
{
	char	*ptr;
	int		c;

	setbuf(stdout, NULL);			/* set unbuffered */
	for (ptr = str; c = *ptr++; )
		putc(c, stdout);
}