156 lines
4.2 KiB
C
156 lines
4.2 KiB
C
/*
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* Copyright (C) 2000 Jason Evans <jasone@freebsd.org>.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice(s), this list of conditions and the following disclaimer as
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* the first lines of this file unmodified other than the possible
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* addition of one or more copyright notices.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice(s), this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/fcntl.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/uio.h>
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#include <errno.h>
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#include <pthread.h>
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#include "pthread_private.h"
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__weak_reference(_sendfile, sendfile);
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int
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_sendfile(int fd, int s, off_t offset, size_t nbytes, struct sf_hdtr *hdtr,
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off_t *sbytes, int flags)
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{
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struct pthread *curthread = _get_curthread();
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int ret, type, blocking;
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ssize_t wvret, num = 0;
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off_t n, nwritten = 0;
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/* Write the headers if any. */
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if ((hdtr != NULL) && (hdtr->headers != NULL)) {
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if ((wvret = writev(s, hdtr->headers, hdtr->hdr_cnt)) == -1) {
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ret = -1;
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goto ERROR;
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} else
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nwritten += wvret;
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}
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/* Lock the descriptors. */
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if ((ret = _FD_LOCK(fd, FD_READ, NULL)) != 0) {
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ret = -1;
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errno = EBADF;
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goto ERROR;
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}
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if ((ret = _FD_LOCK(s, FD_WRITE, NULL)) != 0) {
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ret = -1;
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errno = EBADF;
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goto ERROR_1;
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}
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/* Check the descriptor access modes. */
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type = _thread_fd_table[fd]->flags & O_ACCMODE;
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if (type != O_RDONLY && type != O_RDWR) {
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/* File is not open for read. */
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ret = -1;
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errno = EBADF;
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goto ERROR_2;
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}
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type = _thread_fd_table[s]->flags & O_ACCMODE;
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if (type != O_WRONLY && type != O_RDWR) {
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/* File is not open for write. */
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ret = -1;
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errno = EBADF;
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goto ERROR_2;
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}
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/* Check if file operations are to block */
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blocking = ((_thread_fd_table[s]->flags & O_NONBLOCK) == 0);
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/*
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* Loop while no error occurs and until the expected number of bytes are
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* written.
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*/
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for (;;) {
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/* Perform a non-blocking sendfile syscall. */
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ret = __sys_sendfile(fd, s, offset + num, nbytes - num,
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NULL, &n, flags);
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if (ret == 0) {
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/* Writing completed. */
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num += n;
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break;
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} else if ((blocking) && (ret == -1) && (errno == EAGAIN)) {
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/*
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* Some bytes were written but there are still more to
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* write.
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*/
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/* Update the count of bytes written. */
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num += n;
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curthread->data.fd.fd = fd;
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_thread_kern_set_timeout(NULL);
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/* Reset the interrupted operation flag. */
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curthread->interrupted = 0;
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_thread_kern_sched_state(PS_FDW_WAIT, __FILE__,
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__LINE__);
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if (curthread->interrupted) {
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/* Interrupted by a signal. Return an error. */
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break;
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}
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} else {
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/* Incomplete non-blocking syscall, or error. */
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break;
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}
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}
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ERROR_2:
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_FD_UNLOCK(s, FD_WRITE);
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ERROR_1:
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_FD_UNLOCK(fd, FD_READ);
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ERROR:
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if (ret == 0) {
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/* Write the trailers, if any. */
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if ((hdtr != NULL) && (hdtr->trailers != NULL)) {
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if ((wvret = writev(s, hdtr->trailers, hdtr->trl_cnt))
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== -1)
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ret = -1;
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else
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nwritten += wvret;
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}
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}
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if (sbytes != NULL) {
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/*
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* Number of bytes written in headers/trailers, plus in the main
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* sendfile() loop.
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*/
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*sbytes = nwritten + num;
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}
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return ret;
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}
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