2 * $Id: ad_sendfile.c,v 1.11 2010-01-21 14:14:49 didg Exp $
4 * Copyright (c) 1999 Adrian Sun (asun@zoology.washington.edu)
5 * All rights reserved. See COPYRIGHT.
7 * NOTE: the following uses the fact that sendfile() only exists on
8 * machines with SA_RESTART behaviour. this is all very machine specific.
10 * sendfile chainsaw from samba.
11 Unix SMB/Netbios implementation.
13 sendfile implementations.
14 Copyright (C) Jeremy Allison 2002.
16 This program is free software; you can redistribute it and/or modify
17 it under the terms of the GNU General Public License as published by
18 the Free Software Foundation; either version 2 of the License, or
19 (at your option) any later version.
20 This program is distributed in the hope that it will be useful,
21 but WITHOUT ANY WARRANTY; without even the implied warranty of
22 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 GNU General Public License for more details.
25 You should have received a copy of the GNU General Public License
26 along with this program; if not, write to the Free Software
27 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
32 #endif /* HAVE_CONFIG_H */
36 #include <atalk/adouble.h>
40 #include <sys/socket.h>
45 #include <atalk/logger.h>
46 #include "ad_private.h"
48 #if defined(LINUX_BROKEN_SENDFILE_API)
50 extern int32_t sendfile (int fdout, int fdin, int32_t *offset, u_int32_t count);
52 ssize_t sys_sendfile(int tofd, int fromfd, off_t *offset, size_t count)
54 u_int32_t small_total;
59 * Fix for broken Linux 2.4 systems with no working sendfile64().
60 * If the offset+count > 2 GB then pretend we don't have the
61 * system call sendfile at all. The upper layer catches this
62 * and uses a normal read. JRA.
65 if ((sizeof(off_t) >= 8) && (*offset + count > (off_t)0x7FFFFFFF)) {
69 small_offset = (int32_t)*offset;
70 small_total = (u_int32_t)count;
71 nwritten = sendfile(tofd, fromfd, &small_offset, small_total);
78 #elif defined(SENDFILE_FLAVOR_LINUX)
79 #include <sys/sendfile.h>
81 ssize_t sys_sendfile(int tofd, int fromfd, off_t *offset, size_t count)
83 return sendfile(tofd, fromfd, offset, count);
86 #elif defined(SENDFILE_FLAVOR_BSD )
88 #error sendfile semantic broken
89 #include <sys/sendfile.h>
90 ssize_t sys_sendfile(int tofd, int fromfd, off_t *offset, size_t count)
99 ret = sendfile(fromfd, tofd, offset, count, NULL, &nwritten, 0);
100 while (ret == -1 && errno == EINTR);
111 ssize_t sys_sendfile(int out_fd, int in_fd, off_t *_offset, size_t count)
113 /* No sendfile syscall. */
119 /* ------------------------------- */
120 int ad_readfile_init(const struct adouble *ad,
121 const int eid, off_t *off,
127 *off = ad_size(ad, eid) - *off;
129 if (eid == ADEID_DFORK) {
130 fd = ad_data_fileno(ad);
132 *off += ad_getentryoff(ad, eid);
133 fd = ad_reso_fileno(ad);
140 /* ------------------------ */
142 #ifdef HAVE_SENDFILE_WRITE
143 /* read from a socket and write to an adouble file */
144 ssize_t ad_writefile(struct adouble *ad, const int eid,
145 const int sock, off_t off, const int end,
152 fd = ad_sendfile_init(ad, eid, &off, end);
153 if ((cc = sys_sendfile(fd, sock, &off, len)) < 0)
156 if ((eid != ADEID_DFORK) && (off > ad_getentrylen(ad, eid)))
157 ad_setentrylen(ad, eid, off);
160 #endif /* __linux__ */
162 #endif /* HAVE_SENDFILE_WRITE */