sizepipe.c

UNIX环境高级编程第二版（英文版）配书的源代码

#include "apue.h"
#include <fcntl.h>

int
main(void)
{
	int i, n;
	int fd[2];

	if (pipe(fd) < 0)
		err_sys("pipe error");
	set_fl(fd[1], O_NONBLOCK);

	/*
	 * Write 1 byte at a time until pipe is full.
	 */
	for (n = 0; ; n++) {
		if ((i = write(fd[1], "a", 1)) != 1) {
			printf("write ret %d, ", i);
			break;
		}
	}
	printf("pipe capacity = %d\n", n);
	exit(0);
}