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/*
Unix SMB/Netbios implementation.
Version 2.2.x / 3.0.x
sendfile implementations.
Copyright (C) Jeremy Allison 2002.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* This file handles the OS dependent sendfile implementations.
* The API is such that it returns -1 on error, else returns the
* number of bytes written.
*/
#include "includes.h"
#if defined(LINUX_SENDFILE_API)
#include <sys/sendfile.h>
#ifndef MSG_MORE
#define MSG_MORE 0x8000
#endif
ssize_t sys_sendfile(int tofd, int fromfd, const DATA_BLOB *header, SMB_OFF_T offset, size_t count)
{
size_t total=0;
ssize_t ret;
ssize_t hdr_len = 0;
/*
* Send the header first.
* Use MSG_MORE to cork the TCP output until sendfile is called.
*/
if (header) {
hdr_len = header->length;
while (total < hd_len) {
ret = sys_send(tofd, header->data + total,hdr_len - total, MSG_MORE);
if (ret == -1)
return -1;
total += ret;
}
}
total = count;
while (total) {
ssize_t nwritten;
do {
#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_OFF64_T) && defined(SENDFILE64)
nwritten = sendfile64(tofd, fromfd, &offset, total);
#else
nwritten = sendfile(tofd, fromfd, &offset, total);
#endif
} while (nwritten == -1 && errno == EINTR);
if (nwritten == -1)
return -1;
if (nwritten == 0)
return -1; /* I think we're at EOF here... */
total -= nwritten;
}
return count + hdr_len;
}
#elif defined(SOLARIS_SENDFILE_API)
ssize_t sys_sendfile(int tofd, int fromfd, const DATA_BLOB *header, SMB_OFF_T offset, size_t count)
{
}
#elif defined(HPUX_SENDFILE_API)
#include <sys/socket.h>
#include <sys/uio.h>
ssize_t sys_sendfile(int tofd, int fromfd, const DATA_BLOB *header, SMB_OFF_T offset, size_t count)
{
size_t total=0;
struct iovec hdtrl[2];
size_t hdr_len = 0;
if (header) {
/* Set up the header/trailer iovec. */
hdtrl[0].iov_base = header->data;
hdtrl[0].iov_len = hdr_len = header->length;
} else {
hdtrl[0].iov_base = NULL;
hdtrl[0].iov_len = hdr_len = 0;
}
hdtrl[1].iov_base = NULL;
hdtrl[1].iov_base = 0;
total = count;
while (total + hdtrl[0].iov_len) {
ssize_t nwritten;
/*
* HPUX guarantees that if any data was written before
* a signal interrupt then sendfile returns the number of
* bytes written (which may be less than requested) not -1.
* nwritten includes the header data sent.
*/
do {
#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_OFF64_T) && defined(SENDFILE64)
nwritten = sendfile64(tofd, fromfd, offset, total, &hdtrl[0], 0);
#else
nwritten = sendfile(tofd, fromfd, offset, total, &hdtrl[0], 0);
#endif
} while (nwritten == -1 && errno == EINTR);
if (nwritten == -1)
return -1;
if (nwritten == 0)
return -1; /* I think we're at EOF here... */
/*
* If this was a short (signal interrupted) write we may need
* to subtract it from the header data, or null out the header
* data altogether if we wrote more than hdtrl[0].iov_len bytes.
* We change nwritten to be the number of file bytes written.
*/
if (hdtrl[0].iov_base && hdtrl[0].iov_len) {
if (nwritten >= hdtrl[0].iov_len) {
nwritten -= hdtrl[0].iov_len;
hdtrl[0].iov_base = NULL;
hdtrl[0].iov_len = 0;
} else {
nwritten = 0;
hdtrl[0].iov_base += nwritten;
hdtrl[0].iov_len -= nwritten;
}
}
total -= nwritten;
offset += nwritten;
}
return count + hdr_len;
}
#elif defined(FREEBSD_SENDFILE_API)
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/uio.h>
ssize_t sys_sendfile(int tofd, int fromfd, const DATA_BLOB *header, SMB_OFF_T offset, size_t count)
{
size_t total=0;
struct sf_hdtr hdr;
struct iovec hdtrl;
size_t hdr_len = 0;
hdr->headers = &hdtrl;
hdr->hdr_cnt = 1;
hdr->trailers = NULL;
hdr->trl_cnt = 0;
/* Set up the header iovec. */
if (header) {
hdtrl.iov_base = header->data;
hdtrl.iov_len = hdr_len = header->length;
} else {
hdtrl.iov_base = NULL;
hdtrl.iov_len = 0;
}
total = count;
while (total + hdtrl.iov_len) {
SMB_OFF_T nwritten;
int ret;
/*
* FreeBSD sendfile returns 0 on success, -1 on error.
* Remember, the tofd and fromfd are reversed..... :-).
* nwritten includes the header data sent.
*/
do {
ret = sendfile(fromfd, tofd, offset, total, &hdr, &nwritten, 0);
} while (ret == -1 && errno == EINTR);
if (ret == -1)
return -1;
if (nwritten == 0)
return -1; /* I think we're at EOF here... */
/*
* If this was a short (signal interrupted) write we may need
* to subtract it from the header data, or null out the header
* data altogether if we wrote more than hdtrl.iov_len bytes.
* We change nwritten to be the number of file bytes written.
*/
if (hdtrl[0].iov_base && hdtrl.iov_len) {
if (nwritten >= hdtrl.iov_len) {
nwritten -= hdtrl.iov_len;
hdtrl.iov_base = NULL;
hdtrl.iov_len = 0;
} else {
nwritten = 0;
hdtrl.iov_base += nwritten;
hdtrl.iov_len -= nwritten;
}
}
total -= nwritten;
offset += nwritten;
}
return count + hdr_len;
}
#else /* No sendfile implementation. Return error. */
ssize_t sys_sendfile(int tofd, int fromfd, const DATA_BLOB *header, SMB_OFF_T offset, size_t count)
{
/* No sendfile syscall. */
errno = ENOSYS;
return -1;
}
#endif
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