2 Unix SMB/Netbios implementation.
4 read/write to a files_struct
5 Copyright (C) Andrew Tridgell 1992-1998
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 extern int DEBUGLEVEL;
27 /****************************************************************************
28 seek a file. Try to avoid the seek if possible
29 ****************************************************************************/
31 SMB_OFF_T seek_file(files_struct *fsp,SMB_OFF_T pos)
36 if (fsp->print_file && lp_postscript(fsp->conn->service))
39 seek_ret = sys_lseek(fsp->fd_ptr->fd,pos+offset,SEEK_SET);
41 if((seek_ret == -1) || (seek_ret != pos+offset)) {
42 DEBUG(0,("seek_file: sys_lseek failed. Error was %s\n", strerror(errno) ));
47 fsp->pos = seek_ret - offset;
49 DEBUG(10,("seek_file: requested pos = %.0f, new pos = %.0f\n",
50 (double)(pos+offset), (double)fsp->pos ));
55 /****************************************************************************
57 ****************************************************************************/
59 ssize_t read_file(files_struct *fsp,char *data,SMB_OFF_T pos,size_t n)
61 ssize_t ret=0,readret;
63 #if USE_READ_PREDICTION
64 if (!fsp->can_write) {
65 ret = read_predict(fsp->fd_ptr->fd,pos,data,NULL,n);
75 SMB_OFF_T num = (fsp->mmap_size > pos) ? (fsp->mmap_size - pos) : 0;
78 memcpy(data,fsp->mmap_ptr+pos,num);
87 if (seek_file(fsp,pos) == -1) {
88 DEBUG(3,("read_file: Failed to seek to %.0f\n",(double)pos));
93 readret = read(fsp->fd_ptr->fd,data,n);
94 if (readret > 0) ret += readret;
101 /****************************************************************************
103 ****************************************************************************/
105 ssize_t write_file(files_struct *fsp,char *data,size_t n)
108 if (!fsp->can_write) {
113 if (!fsp->modified) {
115 fsp->modified = True;
116 if (sys_fstat(fsp->fd_ptr->fd,&st) == 0) {
117 int dosmode = dos_mode(fsp->conn,fsp->fsp_name,&st);
118 if (MAP_ARCHIVE(fsp->conn) && !IS_DOS_ARCHIVE(dosmode)) {
119 file_chmod(fsp->conn,fsp->fsp_name,dosmode | aARCH,&st);
124 return(write_data(fsp->fd_ptr->fd,data,n));
128 /*******************************************************************
130 ********************************************************************/
132 void sync_file(connection_struct *conn, files_struct *fsp)
135 if(lp_strict_sync(SNUM(conn)))
136 fsync(fsp->fd_ptr->fd);