SRead.c File Reference

#include "syshdrs.h"

Include dependency graph for SRead.c:

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Functions
static char	UNUSED (gSioVersion[])
static char	UNUSED (gNoSignalsMarker[])
int	SRead (int sfd, char *const buf0, size_t size, int tlen, int retry)

Function Documentation

SRead()

int SRead	(	int	sfd,
		char *const	buf0,
		size_t	size,
		int	tlen,
		int	retry
	)

Definition at line 118 of file SRead.c.

{
    int nread;
    volatile int nleft;
    char *buf = buf0;
    int tleft;
    time_t done, now;
    fd_set ss;
    struct timeval tv;
    int result, firstRead;

    errno = 0;

    nleft = (int) size;
    time(&now);
    done = now + tlen;
    firstRead = 1;

    forever {
        tleft = (int) (done - now);
        if (tleft < 1) {
            nread = size - nleft;
            if ((nread == 0) || ((retry & (kFullBufferRequired|kFullBufferRequiredExceptLast)) != 0)) {
                nread = kTimeoutErr;
                errno = ETIMEDOUT;
                SETWSATIMEOUTERR
            }
            goto done;
        }

        if (!firstRead || ((retry & kNoFirstSelect) == 0)) {
            forever {
                errno = 0;
                FD_ZERO(&ss);
                FD_SET(sfd, &ss);
                tv.tv_sec = tlen;
                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 */
                    nread = size - nleft;
                    if ((nread > 0) && ((retry & (kFullBufferRequired|kFullBufferRequiredExceptLast)) == 0))
                        return (nread);
                    errno = ETIMEDOUT;
                    SETWSATIMEOUTERR
                        return (kTimeoutErr);
                } else if (errno != EINTR) {
                    return (-1);
                }
            }
            firstRead = 0;
        }

#if defined(WIN32) || defined(_WINDOWS)
        nread = recv(sfd, (char *) buf, nleft, 0);
#else
        nread = read(sfd, (char *) buf, nleft);
#endif

        if (nread <= 0) {
            if (nread == 0) {
                /* EOF */
                if (retry == ((retry & (kFullBufferRequiredExceptLast)) != 0))
                    nread = size - nleft;
                goto done;
            } else if (errno != EINTR) {
                nread = size - nleft;
                if (nread == 0)
                    nread = -1;
                goto done;
            } else {
                errno = 0;
                nread = 0;
                /* Try again. */

                /* Ignore these two lines */
                LIBSIO_USE_VAR(gSioVersion);
                LIBSIO_USE_VAR(gNoSignalsMarker);
            }
        }
        nleft -= nread;
        if ((nleft <= 0) || (((retry & (kFullBufferRequired|kFullBufferRequiredExceptLast)) == 0) && (nleft != (int) size)))
            break;
        buf += nread;
        time(&now);
    }
    nread = size - nleft;

done:
    return (nread);
}   /* SRead */

Referenced by FTPGetOneF(), and SReadline().

UNUSED() [1/2]

static char UNUSED ( gSioVersion  [] )

static

UNUSED() [2/2]

static char UNUSED ( gNoSignalsMarker  [] )

static