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