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https://github.com/samba-team/samba.git
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14500936c3
to check for stat64 and friends, and then changes much of Samba to use the data type SMB_OFF_T for file size information. stat/fstat/lstat/lseek/ftruncate have now become sys_stat etc. to hide the 64 bit calls if needed. Note that this still does not expose 64 bit functionality to the client, as the changes to the reply_xxx smb's are not yet done. This code change should make these changes possible. Still to do before full 64 bit-ness to the client: fcntl lock code. statfs code widening of dev_t and ino_t (now possible due to SMB_DEV_T and SMB_OFF_T types being in place). Let me know if wierd things happen after this check-in and I'll fix them :-). Jeremy.
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130 lines
3.2 KiB
C
130 lines
3.2 KiB
C
/*
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Unix SMB/Netbios implementation.
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Version 1.9.
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read/write to a files_struct
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Copyright (C) Andrew Tridgell 1992-1998
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "includes.h"
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extern int DEBUGLEVEL;
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/****************************************************************************
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seek a file. Try to avoid the seek if possible
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****************************************************************************/
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SMB_OFF_T seek_file(files_struct *fsp,SMB_OFF_T pos)
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{
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SMB_OFF_T offset = 0;
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if (fsp->print_file && lp_postscript(fsp->conn->service))
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offset = 3;
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fsp->pos = (sys_lseek(fsp->fd_ptr->fd,pos+offset,SEEK_SET) - offset);
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return(fsp->pos);
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}
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/****************************************************************************
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read from a file
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****************************************************************************/
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int read_file(files_struct *fsp,char *data,uint32 pos,int n)
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{
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int ret=0,readret;
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#if USE_READ_PREDICTION
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if (!fsp->can_write)
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{
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ret = read_predict(fsp->fd_ptr->fd,pos,data,NULL,n);
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data += ret;
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n -= ret;
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pos += ret;
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}
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#endif
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#if WITH_MMAP
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if (fsp->mmap_ptr)
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{
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int num = (fsp->mmap_size > pos) ? (fsp->mmap_size - pos) : -1;
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num = MIN(n,num);
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if (num > 0)
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{
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memcpy(data,fsp->mmap_ptr+pos,num);
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data += num;
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pos += num;
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n -= num;
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ret += num;
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}
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}
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#endif
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if (n <= 0)
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return(ret);
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if (seek_file(fsp,pos) != pos)
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{
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DEBUG(3,("Failed to seek to %d\n",pos));
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return(ret);
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}
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if (n > 0) {
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readret = read(fsp->fd_ptr->fd,data,n);
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if (readret > 0) ret += readret;
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}
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return(ret);
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}
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/****************************************************************************
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write to a file
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****************************************************************************/
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int write_file(files_struct *fsp,char *data,int n)
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{
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if (!fsp->can_write) {
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errno = EPERM;
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return(0);
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}
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if (!fsp->modified) {
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SMB_STRUCT_STAT st;
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fsp->modified = True;
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if (sys_fstat(fsp->fd_ptr->fd,&st) == 0) {
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int dosmode = dos_mode(fsp->conn,fsp->fsp_name,&st);
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if (MAP_ARCHIVE(fsp->conn) && !IS_DOS_ARCHIVE(dosmode)) {
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file_chmod(fsp->conn,fsp->fsp_name,dosmode | aARCH,&st);
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}
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}
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}
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return(write_data(fsp->fd_ptr->fd,data,n));
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}
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/*******************************************************************
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sync a file
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********************************************************************/
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void sync_file(connection_struct *conn, files_struct *fsp)
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{
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#ifdef HAVE_FSYNC
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if(lp_strict_sync(SNUM(conn)))
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fsync(fsp->fd_ptr->fd);
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#endif
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}
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