readable_timeo.c

来自「unix网络编程第一卷socket编程书上的全部源代码」· C语言 代码 · 共 30 行

/* include readable_timeo */
#include	"unp.h"

int
readable_timeo(int fd, int sec)
{
	fd_set			rset;
	struct timeval	tv;

	FD_ZERO(&rset);
	FD_SET(fd, &rset);

	tv.tv_sec = sec;
	tv.tv_usec = 0;

	return(select(fd+1, &rset, NULL, NULL, &tv));
		/* 4> 0 if descriptor is readable */
}
/* end readable_timeo */

int
Readable_timeo(int fd, int sec)
{
	int		n;

	if ( (n = readable_timeo(fd, sec)) < 0)
		err_sys("readable_timeo error");
	return(n);
}