SRecvfrom.c File Reference

#include "syshdrs.h"

Include dependency graph for SRecvfrom.c:

Go to the source code of this file.

Functions
int	SRecvfrom (int sfd, char *const buf, size_t size, int fl, struct sockaddr_in *const fromAddr, int tlen)

Function Documentation

SRecvfrom()

int SRecvfrom	(	int	sfd,
		char *const	buf,
		size_t	size,
		int	fl,
		struct sockaddr_in *const	fromAddr,
		int	tlen
	)

Definition at line 69 of file SRecvfrom.c.

{
    int nread, tleft;
    fd_set ss;
    struct timeval tv;
    int result;
    time_t done, now;
    int alen;
 
    time(&now);
    done = now + tlen;
    tleft = (int) (done - now);
    nread = 0;
    forever {
        alen = sizeof(struct sockaddr_in);
 
        forever {
            errno = 0;
            FD_ZERO(&ss);
            FD_SET(sfd, &ss);
            tv.tv_sec = tleft;
            tv.tv_usec = 0;
            result = select(sfd + 1, SELECT_TYPE_ARG234 &ss, NULL, NULL, SELECT_TYPE_ARG5 &tv);
            if (result == 1) {
                /* ready */
                break;
            } else if (result == 0) {
                /* timeout */
                errno = ETIMEDOUT;
                SETWSATIMEOUTERR
                return (kTimeoutErr);
            } else if (errno != EINTR) {
                return (-1);
            }
        }
 
        nread = recvfrom(sfd, buf, size, fl,
            (struct sockaddr *) fromAddr, &alen);
 
        if (nread >= 0)
            break;
        if (errno != EINTR)
            break;      /* Fatal error. */
        errno = 0;
        time(&now);
        tleft = (int) (done - now);
        if (tleft < 1) {
            nread = kTimeoutErr;
            errno = ETIMEDOUT;
            SETWSATIMEOUTERR
            break;
        }
    }
 
    return (nread);
}   /* SRecvfrom */