SWait.c File Reference

#include "syshdrs.h"

Include dependency graph for SWait.c:

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Functions
int	SWaitUntilReadyForReading (const int sfd, const int tlen)
int	SWaitUntilReadyForWriting (const int sfd, const int tlen)

Function Documentation

SWaitUntilReadyForReading()

int SWaitUntilReadyForReading	(	const int	sfd,
		const int	tlen
	)

Definition at line 7 of file SWait.c.

{
    fd_set ss, ss2;
    struct timeval tv;
    int result;
    int tleft;
    time_t now, done;

    if (sfd < 0) {
        errno = EBADF;
        return (0);
    }

    time(&now);
    done = now + tlen;
    tleft = tlen;

    forever {
        FD_ZERO(&ss);
        FD_SET(sfd, &ss);
        ss2 = ss;
        tv.tv_sec = tleft;
        tv.tv_usec = 0;
        result = select(sfd + 1, SELECT_TYPE_ARG234 &ss, NULL, SELECT_TYPE_ARG234 &ss2, &tv);
        if (result == 1) {
            /* ready */
            return (1);
        } else if (result < 0) {
            if (errno != EINTR) {
                /* error */
                return (0);
            }
            /* try again */
            time(&now);
            if (now > done) {
                /* timed-out */
                errno = ETIMEDOUT;
                return (0);
            }
            tleft = (int) (done - now);
        } else {
            /* timed-out */
            errno = ETIMEDOUT;
            return (0);
        }
    }
}   /* SWaitUntilReadyForReading */

Referenced by GetResponse().

SWaitUntilReadyForWriting()

int SWaitUntilReadyForWriting	(	const int	sfd,
		const int	tlen
	)

Definition at line 62 of file SWait.c.

{
    fd_set ss, ss2;
    struct timeval tv;
    int result;
    int tleft;
    time_t now, done;

    if (sfd < 0) {
        errno = EBADF;
        return (0);
    }

    time(&now);
    done = now + tlen;
    tleft = tlen;

    forever {
        FD_ZERO(&ss);
        FD_SET(sfd, &ss);
        ss2 = ss;
        tv.tv_sec = tleft;
        tv.tv_usec = 0;
        result = select(sfd + 1, NULL, SELECT_TYPE_ARG234 &ss, SELECT_TYPE_ARG234 &ss2, &tv);
        if (result == 1) {
            /* ready */
            return (1);
        } else if (result < 0) {
            if (errno != EINTR) {
                /* error */
                return (0);
            }
            /* try again */
            time(&now);
            if (now > done) {
                /* timed-out */
                errno = ETIMEDOUT;
                return (0);
            }
            tleft = (int) (done - now);
        } else {
            /* timed-out */
            errno = ETIMEDOUT;
            return (0);
        }
    }
}   /* SWaitUntilReadyForWriting */