clrfl.c

unix环境高级编程的源代码

#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");
}