sendrecv.c

log4cxx 0.10 unix下编译包

/* Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "apr_arch_networkio.h"
#include "apr_support.h"

#if APR_HAS_SENDFILE
/* This file is needed to allow us access to the apr_file_t internals. */
#include "apr_arch_file_io.h"
#endif /* APR_HAS_SENDFILE */

/* osreldate.h is only needed on FreeBSD for sendfile detection */
#if defined(__FreeBSD__)
#include <osreldate.h>
#endif

apr_status_t apr_socket_send(apr_socket_t *sock, const char *buf, 
                             apr_size_t *len)
{
    apr_ssize_t rv;
    
    if (sock->options & APR_INCOMPLETE_WRITE) {
        sock->options &= ~APR_INCOMPLETE_WRITE;
        goto do_select;
    }

    do {
        rv = write(sock->socketdes, buf, (*len));
    } while (rv == -1 && errno == EINTR);

    while (rv == -1 && (errno == EAGAIN || errno == EWOULDBLOCK) 
                    && (sock->timeout > 0)) {
        apr_status_t arv;
do_select:
        arv = apr_wait_for_io_or_timeout(NULL, sock, 0);
        if (arv != APR_SUCCESS) {
            *len = 0;
            return arv;
        }
        else {
            do {
                rv = write(sock->socketdes, buf, (*len));
            } while (rv == -1 && errno == EINTR);
        }
    }
    if (rv == -1) {
        *len = 0;
        return errno;
    }
    if ((sock->timeout > 0) && (rv < *len)) {
        sock->options |= APR_INCOMPLETE_WRITE;
    }
    (*len) = rv;
    return APR_SUCCESS;
}

apr_status_t apr_socket_recv(apr_socket_t *sock, char *buf, apr_size_t *len)
{
    apr_ssize_t rv;
    apr_status_t arv;

    if (sock->options & APR_INCOMPLETE_READ) {
        sock->options &= ~APR_INCOMPLETE_READ;
        goto do_select;
    }

    do {
        rv = read(sock->socketdes, buf, (*len));
    } while (rv == -1 && errno == EINTR);

    while ((rv == -1) && (errno == EAGAIN || errno == EWOULDBLOCK)
                      && (sock->timeout > 0)) {
do_select:
        arv = apr_wait_for_io_or_timeout(NULL, sock, 1);
        if (arv != APR_SUCCESS) {
            *len = 0;
            return arv;
        }
        else {
            do {
                rv = read(sock->socketdes, buf, (*len));
            } while (rv == -1 && errno == EINTR);
        }
    }
    if (rv == -1) {
        (*len) = 0;
        return errno;
    }
    if ((sock->timeout > 0) && (rv < *len)) {
        sock->options |= APR_INCOMPLETE_READ;
    }
    (*len) = rv;
    if (rv == 0) {
        return APR_EOF;
    }
    return APR_SUCCESS;
}

apr_status_t apr_socket_sendto(apr_socket_t *sock, apr_sockaddr_t *where,
                               apr_int32_t flags, const char *buf,
                               apr_size_t *len)
{
    apr_ssize_t rv;

    do {
        rv = sendto(sock->socketdes, buf, (*len), flags, 
                    (const struct sockaddr*)&where->sa, 
                    where->salen);
    } while (rv == -1 && errno == EINTR);

    while ((rv == -1) && (errno == EAGAIN || errno == EWOULDBLOCK)
                      && (sock->timeout > 0)) {
        apr_status_t arv = apr_wait_for_io_or_timeout(NULL, sock, 0);
        if (arv != APR_SUCCESS) {
            *len = 0;
            return arv;
        } else {
            do {
                rv = sendto(sock->socketdes, buf, (*len), flags,
                            (const struct sockaddr*)&where->sa,
                            where->salen);
            } while (rv == -1 && errno == EINTR);
        }
    }
    if (rv == -1) {
        *len = 0;
        return errno;
    }
    *len = rv;
    return APR_SUCCESS;
}

apr_status_t apr_socket_recvfrom(apr_sockaddr_t *from, apr_socket_t *sock,
                                 apr_int32_t flags, char *buf, 
                                 apr_size_t *len)
{
    apr_ssize_t rv;

    do {
        rv = recvfrom(sock->socketdes, buf, (*len), flags, 
                      (struct sockaddr*)&from->sa, &from->salen);
    } while (rv == -1 && errno == EINTR);

    while ((rv == -1) && (errno == EAGAIN || errno == EWOULDBLOCK)
                      && (sock->timeout > 0)) {
        apr_status_t arv = apr_wait_for_io_or_timeout(NULL, sock, 1);
        if (arv != APR_SUCCESS) {
            *len = 0;
            return arv;
        } else {
            do {
                rv = recvfrom(sock->socketdes, buf, (*len), flags,
                              (struct sockaddr*)&from->sa, &from->salen);
            } while (rv == -1 && errno == EINTR);
        }
    }
    if (rv == -1) {
        (*len) = 0;
        return errno;
    }

    (*len) = rv;
    if (rv == 0 && sock->type == SOCK_STREAM) {
        return APR_EOF;
    }

    return APR_SUCCESS;
}

apr_status_t apr_socket_sendv(apr_socket_t * sock, const struct iovec *vec,
                              apr_int32_t nvec, apr_size_t *len)
{
#ifdef HAVE_WRITEV
    apr_ssize_t rv;
    apr_size_t requested_len = 0;
    apr_int32_t i;

    for (i = 0; i < nvec; i++) {
        requested_len += vec[i].iov_len;
    }

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

    do {
        rv = writev(sock->socketdes, vec, nvec);
    } while (rv == -1 && errno == EINTR);

    while ((rv == -1) && (errno == EAGAIN || errno == EWOULDBLOCK) 
                      && (sock->timeout > 0)) {
        apr_status_t arv;
do_select:
        arv = apr_wait_for_io_or_timeout(NULL, sock, 0);
        if (arv != APR_SUCCESS) {
            *len = 0;
            return arv;
        }
        else {
            do {
                rv = writev(sock->socketdes, vec, nvec);
            } while (rv == -1 && errno == EINTR);
        }
    }
    if (rv == -1) {
        *len = 0;
        return errno;
    }
    if ((sock->timeout > 0) && (rv < requested_len)) {
        sock->options |= APR_INCOMPLETE_WRITE;
    }
    (*len) = rv;
    return APR_SUCCESS;
#else
    *len = vec[0].iov_len;
    return apr_socket_send(sock, vec[0].iov_base, len);
#endif
}

#if APR_HAS_SENDFILE

/* TODO: Verify that all platforms handle the fd the same way,
 * i.e. that they don't move the file pointer.
 */
/* TODO: what should flags be?  int_32? */

/* Define a structure to pass in when we have a NULL header value */
static apr_hdtr_t no_hdtr;

#if defined(__linux__) && defined(HAVE_WRITEV)

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 rv, nbytes = 0, total_hdrbytes, i;
    apr_status_t arv;

#if APR_HAS_LARGE_FILES && defined(HAVE_SENDFILE64)
    apr_off_t off = *offset;
#define sendfile sendfile64

#elif APR_HAS_LARGE_FILES && SIZEOF_OFF_T == 4
    /* 64-bit apr_off_t but no sendfile64(): fail if trying to send
     * past the 2Gb limit. */
    off_t off;
    
    if ((apr_int64_t)*offset + *len > INT_MAX) {
        return EINVAL;
    }
    
    off = *offset;

#else
    off_t off = *offset;

    /* Multiple reports have shown sendfile failing with EINVAL if
     * passed a >=2Gb count value on some 64-bit kernels.  It won't
     * noticably hurt performance to limit each call to <2Gb at a
     * time, so avoid that issue here: */
    if (sizeof(off_t) == 8 && *len > INT_MAX) {
        *len = INT_MAX;
    }
#endif

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

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

    if (hdtr->numheaders > 0) {
        apr_size_t hdrbytes;

        /* cork before writing headers */
        rv = apr_socket_opt_set(sock, APR_TCP_NOPUSH, 1);
        if (rv != APR_SUCCESS) {
            return rv;
        }

        /* Now write the headers */
        arv = apr_socket_sendv(sock, hdtr->headers, hdtr->numheaders,
                               &hdrbytes);
        if (arv != APR_SUCCESS) {
            *len = 0;
            return errno;
        }
        nbytes += hdrbytes;

        /* If this was a partial write and we aren't doing timeouts, 
         * return now with the partial byte count; this is a non-blocking 
         * socket.
         */
        total_hdrbytes = 0;
        for (i = 0; i < hdtr->numheaders; i++) {
            total_hdrbytes += hdtr->headers[i].iov_len;
        }
        if (hdrbytes < total_hdrbytes) {
            *len = hdrbytes;
            return apr_socket_opt_set(sock, APR_TCP_NOPUSH, 0);
        }
    }

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

    do {
        rv = sendfile(sock->socketdes,    /* socket */
                      file->filedes, /* open file descriptor of the file to be sent */
                      &off,    /* where in the file to start */
                      *len);   /* number of bytes to send */
    } while (rv == -1 && errno == EINTR);

    while ((rv == -1) && (errno == EAGAIN || errno == EWOULDBLOCK) 
                      && (sock->timeout > 0)) {
do_select:
        arv = apr_wait_for_io_or_timeout(NULL, sock, 0);
        if (arv != APR_SUCCESS) {
            *len = 0;
            return arv;
        }
        else {
            do {
                rv = sendfile(sock->socketdes,    /* socket */
                              file->filedes, /* open file descriptor of the file to be sent */
                              &off,    /* where in the file to start */
                              *len);    /* number of bytes to send */
            } while (rv == -1 && errno == EINTR);
        }
    }

    if (rv == -1) {
        *len = nbytes;
        rv = errno;
        apr_socket_opt_set(sock, APR_TCP_NOPUSH, 0);
        return rv;
    }

    nbytes += rv;

    if (rv < *len) {
        *len = nbytes;
        arv = apr_socket_opt_set(sock, APR_TCP_NOPUSH, 0);
        if (rv > 0) {
                
            /* If this was a partial write, return now with the 
             * partial byte count;  this is a non-blocking socket.
             */

            if (sock->timeout > 0) {
                sock->options |= APR_INCOMPLETE_WRITE;
            }
            return arv;
        }
        else {
            /* If the file got smaller mid-request, eventually the offset
             * becomes equal to the new file size and the kernel returns 0.  
             * Make this an error so the caller knows to log something and
             * exit.
             */
            return APR_EOF;
        }
    }

    /* Now write the footers */
    if (hdtr->numtrailers > 0) {
        apr_size_t trbytes;
        arv = apr_socket_sendv(sock, hdtr->trailers, hdtr->numtrailers, 
                               &trbytes);
        nbytes += trbytes;
        if (arv != APR_SUCCESS) {
            *len = nbytes;
            rv = errno;
            apr_socket_opt_set(sock, APR_TCP_NOPUSH, 0);
            return rv;
        }
    }

    apr_socket_opt_set(sock, APR_TCP_NOPUSH, 0);
    
    (*len) = nbytes;
    return rv < 0 ? errno : APR_SUCCESS;
}

#elif defined(__FreeBSD__) || defined(__DragonFly__)

/* Release 3.1 or greater */
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)
{
    off_t nbytes = 0;
    int rv, i;
    struct sf_hdtr headerstruct;
    apr_size_t bytes_to_send = *len;

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

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

#if defined(__FreeBSD_version) && __FreeBSD_version < 460001
    else if (hdtr->numheaders) {

        /* On early versions of FreeBSD sendfile, the number of bytes to send 
         * must include the length of the headers.  Don't look at the man page 
         * for this :(  Instead, look at the the logic in 
         * src/sys/kern/uipc_syscalls::sendfile().
         *
         * This was fixed in the middle of 4.6-STABLE
         */
        for (i = 0; i < hdtr->numheaders; i++) {
            bytes_to_send += hdtr->headers[i].iov_len;
        }
    }
#endif

    headerstruct.headers = hdtr->headers;
    headerstruct.hdr_cnt = hdtr->numheaders;
    headerstruct.trailers = hdtr->trailers;
    headerstruct.trl_cnt = hdtr->numtrailers;

    /* FreeBSD can send the headers/footers as part of the system call */
    do {
        if (sock->options & APR_INCOMPLETE_WRITE) {
            apr_status_t arv;
            sock->options &= ~APR_INCOMPLETE_WRITE;
            arv = apr_wait_for_io_or_timeout(NULL, sock, 0);
            if (arv != APR_SUCCESS) {
                *len = 0;
                return arv;
            }
        }
        if (bytes_to_send) {
            /* We won't dare call sendfile() if we don't have
             * header or file bytes to send because bytes_to_send == 0
             * means send the whole file.
             */
            rv = sendfile(file->filedes, /* file to be sent */
                          sock->socketdes, /* socket */
                          *offset,       /* where in the file to start */
                          bytes_to_send, /* number of bytes to send */
                          &headerstruct, /* Headers/footers */
                          &nbytes,       /* number of bytes written */
                          flags);        /* undefined, set to 0 */

            if (rv == -1) {
                if (errno == EAGAIN) {
                    if (sock->timeout > 0) {
                        sock->options |= APR_INCOMPLETE_WRITE;
                    }
                    /* FreeBSD's sendfile can return -1/EAGAIN even if it
                     * sent bytes.  Sanitize the result so we get normal EAGAIN
                     * semantics w.r.t. bytes sent.
                     */
                    if (nbytes) {
                        /* normal exit for a big file & non-blocking io */
                        (*len) = nbytes;
                        return APR_SUCCESS;
                    }
                }
            }
            else {       /* rv == 0 (or the kernel is broken) */
                if (nbytes == 0) {
                    /* Most likely the file got smaller after the stat.
                     * Return an error so the caller can do the Right Thing.
                     */
                    (*len) = nbytes;