sendrecv.c

apache的软件linux版本

#elif defined(_AIX) || defined(__MVS__)
/* AIX and OS/390 have the same send_file() interface.
 *
 * subtle differences:
 *   AIX doesn't update the file ptr but OS/390 does
 *
 * availability (correctly determined by autoconf):
 *
 * AIX -  version 4.3.2 with APAR IX85388, or version 4.3.3 and above
 * OS/390 - V2R7 and above
 */
apr_status_t apr_socket_sendfile(apr_socket_t * sock, apr_file_t * file,
                                 apr_hdtr_t * hdtr, apr_off_t * offset,
                                 apr_size_t * len, apr_int32_t flags)
{
    int i, ptr, rv = 0;
    void * hbuf=NULL, * tbuf=NULL;
    apr_status_t arv;
    struct sf_parms parms;

    if (!hdtr) {
        hdtr = &no_hdtr;
    }

    /* Ignore flags for now. */
    flags = 0;

    /* word to the wise: by default, AIX stores files sent by send_file()
     * in the network buffer cache...  there are supposedly scenarios
     * where the most recent copy of the file won't be sent, but I can't
     * recreate the potential problem, perhaps because of the way we
     * use send_file()...  if you suspect such a problem, try turning
     * on the SF_SYNC_CACHE flag
     */

    /* AIX can also send the headers/footers as part of the system call */
    parms.header_length = 0;
    if (hdtr && hdtr->numheaders) {
        if (hdtr->numheaders == 1) {
            parms.header_data = hdtr->headers[0].iov_base;
            parms.header_length = hdtr->headers[0].iov_len;
        }
        else {
            for (i = 0; i < hdtr->numheaders; i++) {
                parms.header_length += hdtr->headers[i].iov_len;
            }
#if 0
            /* Keepalives make apr_palloc a bad idea */
            hbuf = malloc(parms.header_length);
#else
            /* but headers are small, so maybe we can hold on to the
             * memory for the life of the socket...
             */
            hbuf = apr_palloc(sock->cntxt, parms.header_length);
#endif
            ptr = 0;
            for (i = 0; i < hdtr->numheaders; i++) {
                memcpy((char *)hbuf + ptr, hdtr->headers[i].iov_base,
                       hdtr->headers[i].iov_len);
                ptr += hdtr->headers[i].iov_len;
            }
            parms.header_data = hbuf;
        }
    }
    else parms.header_data = NULL;
    parms.trailer_length = 0;
    if (hdtr && hdtr->numtrailers) {
        if (hdtr->numtrailers == 1) {
            parms.trailer_data = hdtr->trailers[0].iov_base;
            parms.trailer_length = hdtr->trailers[0].iov_len;
        }
        else {
            for (i = 0; i < hdtr->numtrailers; i++) {
                parms.trailer_length += hdtr->trailers[i].iov_len;
            }
#if 0
            /* Keepalives make apr_palloc a bad idea */
            tbuf = malloc(parms.trailer_length);
#else
            tbuf = apr_palloc(sock->cntxt, parms.trailer_length);
#endif
            ptr = 0;
            for (i = 0; i < hdtr->numtrailers; i++) {
                memcpy((char *)tbuf + ptr, hdtr->trailers[i].iov_base,
                       hdtr->trailers[i].iov_len);
                ptr += hdtr->trailers[i].iov_len;
            }
            parms.trailer_data = tbuf;
        }
    }
    else {
        parms.trailer_data = NULL;
    }

    /* Whew! Headers and trailers set up. Now for the file data */

    parms.file_descriptor = file->filedes;
    parms.file_offset = *offset;
    parms.file_bytes = *len;

    /* O.K. All set up now. Let's go to town */

    if (sock->netmask & APR_INCOMPLETE_WRITE) {
        sock->netmask &= ~APR_INCOMPLETE_WRITE;
        goto do_select;
    }

    do {
        rv = send_file(&(sock->socketdes), /* socket */
                       &(parms),           /* all data */
                       flags);             /* flags */
    } while (rv == -1 && errno == EINTR);

    while (rv == -1 &&
        (errno == EAGAIN || errno == EWOULDBLOCK) &&
        apr_is_option_set(sock->netmask, APR_SO_TIMEOUT)) {
do_select:
        arv = apr_wait_for_io_or_timeout(NULL, sock, 0);
        if (arv != APR_SUCCESS) {
            *len = 0;
            return arv;
        }
        else {
            do {
                rv = send_file(&(sock->socketdes), /* socket */
                               &(parms),           /* all data */
                               flags);             /* flags */
            } while (rv == -1 && errno == EINTR);
        }
    }

    (*len) = parms.bytes_sent;

#if 0
    /* Clean up after ourselves */
    if(hbuf) free(hbuf);
    if(tbuf) free(tbuf);
#endif

    if (rv == -1) {
        return errno;
    }

    if (apr_is_option_set(sock->netmask, APR_SO_TIMEOUT) &&
        (parms.bytes_sent < (parms.file_bytes + parms.header_length + parms.trailer_length))) {
        sock->netmask |= APR_INCOMPLETE_WRITE;
    }

    return APR_SUCCESS;
}
#elif defined(__osf__) && defined (__alpha)
/* Tru64's sendfile implementation doesn't work, and we need to make sure that
 * we don't use it until it is fixed.  If it is used as it is now, it will
 * hang the machine and the only way to fix it is a reboot.
 */
#elif defined(HAVE_SENDFILEV)
/* Solaris 8's sendfilev() interface 
 *
 * SFV_FD_SELF refers to our memory space.
 *
 * Required Sparc patches (or newer):
 * 111297-01, 108528-09, 109472-06, 109234-03, 108995-02, 111295-01, 109025-03,
 * 108991-13
 * Required x86 patches (or newer):
 * 111298-01, 108529-09, 109473-06, 109235-04, 108996-02, 111296-01, 109026-04,
 * 108992-13
 */
apr_status_t apr_socket_sendfile(apr_socket_t *sock, apr_file_t *file,
                                 apr_hdtr_t *hdtr, apr_off_t *offset,
                                 apr_size_t *len, apr_int32_t flags)
{
    apr_status_t rv, arv;
    apr_size_t nbytes;
    sendfilevec_t *sfv;
    int vecs, curvec, i, repeat;
    apr_size_t requested_len = 0;

    if (!hdtr) {
        hdtr = &no_hdtr;
    }

    /* Ignore flags for now. */
    flags = 0;

    /* Calculate how much space we need. */
    vecs = hdtr->numheaders + hdtr->numtrailers + 1;
    sfv = apr_palloc(sock->cntxt, sizeof(sendfilevec_t) * vecs);

    curvec = 0;

    /* Add the headers */
    for (i = 0; i < hdtr->numheaders; i++, curvec++) {
        sfv[curvec].sfv_fd = SFV_FD_SELF;
        sfv[curvec].sfv_flag = 0;
        sfv[curvec].sfv_off = (off_t)hdtr->headers[i].iov_base;
        sfv[curvec].sfv_len = hdtr->headers[i].iov_len;
        requested_len += sfv[curvec].sfv_len;
    }

    /* If the len is 0, we skip the file. */
    if (*len)
    {
        sfv[curvec].sfv_fd = file->filedes;
        sfv[curvec].sfv_flag = 0;
        sfv[curvec].sfv_off = *offset;
        sfv[curvec].sfv_len = *len; 
        requested_len += sfv[curvec].sfv_len;

        curvec++;
    }
    else {
        vecs--;
    }

    /* Add the footers */
    for (i = 0; i < hdtr->numtrailers; i++, curvec++) {
        sfv[curvec].sfv_fd = SFV_FD_SELF;
        sfv[curvec].sfv_flag = 0;
        sfv[curvec].sfv_off = (off_t)hdtr->trailers[i].iov_base;
        sfv[curvec].sfv_len = hdtr->trailers[i].iov_len;
        requested_len += sfv[curvec].sfv_len;
    }

    /* If the last write couldn't send all the requested data,
     * wait for the socket to become writable before proceeding
     */
    if (sock->netmask & APR_INCOMPLETE_WRITE) {
        sock->netmask &= ~APR_INCOMPLETE_WRITE;
        arv = apr_wait_for_io_or_timeout(NULL, sock, 0);
        if (arv != APR_SUCCESS) {
            *len = 0;
            return arv;
        }
    }
 
    /* Actually do the sendfilev
     *
     * Solaris may return -1/EAGAIN even if it sent bytes on a non-block sock.
     *
     * If no bytes were originally sent (nbytes == 0) and we are on a TIMEOUT 
     * socket (which as far as the OS is concerned is a non-blocking socket), 
     * we want to retry after waiting for the other side to read the data (as 
     * determined by poll).  Once it is clear to send, we want to retry
     * sending the sendfilevec_t once more.
     */
    arv = 0;
    do {
        /* Clear out the repeat */
        repeat = 0;

        /* socket, vecs, number of vecs, bytes written */
        rv = sendfilev(sock->socketdes, sfv, vecs, &nbytes);

        if (rv == -1 && errno == EAGAIN) {
            if (nbytes) {
                rv = 0;
            }
            else if (!arv &&
                     apr_is_option_set(sock->netmask, APR_SO_TIMEOUT) == 1) {
                apr_status_t t = apr_wait_for_io_or_timeout(NULL, sock, 0);

                if (t != APR_SUCCESS) {
                    *len = 0;
                    return t;
                }

                arv = 1; 
                repeat = 1;
            }
        }
    } while ((rv == -1 && errno == EINTR) || repeat);

    if (rv == -1) {
        *len = 0;
        return errno;
    }

    /* Update how much we sent */
    *len = nbytes;
    if (apr_is_option_set(sock->netmask, APR_SO_TIMEOUT) &&
        (*len < requested_len)) {
        sock->netmask |= APR_INCOMPLETE_WRITE;
    }
    return APR_SUCCESS;
}
#else
#error APR has detected sendfile on your system, but nobody has written a
#error version of it for APR yet.  To get past this, either write apr_sendfile
#error or change APR_HAS_SENDFILE in apr.h to 0. 
#endif /* __linux__, __FreeBSD__, __HPUX__, _AIX, __MVS__, Tru64/OSF1 */

/* deprecated */
apr_status_t apr_sendfile(apr_socket_t *sock, apr_file_t *file,
                          apr_hdtr_t *hdtr, apr_off_t *offset, apr_size_t *len,
                          apr_int32_t flags)
{
    return apr_socket_sendfile(sock, file, hdtr, offset, len, flags);
}

#endif /* APR_HAS_SENDFILE */

/* deprecated */
apr_status_t apr_send(apr_socket_t *sock, const char *buf, apr_size_t *len)
{
    return apr_socket_send(sock, buf, len);
}

/* deprecated */
#ifdef HAVE_WRITEV
apr_status_t apr_sendv(apr_socket_t * sock, const struct iovec *vec,
                       apr_int32_t nvec, apr_size_t *len)
{
    return apr_socket_sendv(sock, vec, nvec, len);
}
#endif

/* deprecated */
apr_status_t apr_sendto(apr_socket_t *sock, apr_sockaddr_t *where,
                        apr_int32_t flags, const char *buf, apr_size_t *len)
{
    return apr_socket_sendto(sock, where, flags, buf, len);
}

/* deprecated */
apr_status_t apr_recvfrom(apr_sockaddr_t *from, apr_socket_t *sock,
                          apr_int32_t flags, char *buf, 
                          apr_size_t *len)
{
    return apr_socket_recvfrom(from, sock, flags, buf, len);
}

/* deprecated */
apr_status_t apr_recv(apr_socket_t *sock, char *buf, apr_size_t *len)
{
    return apr_socket_recv(sock, buf, len);
}