clrfl.c

unix环境高级编程一书的源码

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

void
clr_fl(int fd, int flags)
				/* flags are the file status flags to turn off */
{
	int		val;

	if ( (val = fcntl(fd, F_GETFL, 0)) < 0)
		err_sys("fcntl F_GETFL error");

	val &= ~flags;		/* turn flags off */

	if (fcntl(fd, F_SETFL, val) < 0)
		err_sys("fcntl F_SETFL error");
}