From d160d93d8fad563400aa1e1274437df1fbd4ecbf Mon Sep 17 00:00:00 2001 From: Andrew Tridgell Date: Fri, 7 Jun 1996 03:34:22 +0000 Subject: - added predict.c, moving the routines from util.c - added iface_count() and iface_n_ip() routines so its easy to loop over the local interface list - made readsize a normal loadparm global - check for null w in add_domain_entry() - set the deathtime to time()-1 for doamin entries with servertype==0 This allows servers that are shutting down to be removed - add the 0x1c name at startup if we are a WINS server. Previously we added it only if we were a master - loop over interfaces in add_my_domains(), so people don't have to have a lmhosts file to get lp_workgroup() on all interfaces - set add to True for find_workgroupstruct() in nmbsync, and check for null return - remove some ugly "errno = EBADF" bits. they just confused things. (This used to be commit 88b191b48836eeb7937f25b37d0bdd4a2276e5a7) --- source3/smbd/predict.c | 146 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 146 insertions(+) create mode 100644 source3/smbd/predict.c (limited to 'source3/smbd/predict.c') diff --git a/source3/smbd/predict.c b/source3/smbd/predict.c new file mode 100644 index 0000000000..8df381b367 --- /dev/null +++ b/source3/smbd/predict.c @@ -0,0 +1,146 @@ +/* + Unix SMB/Netbios implementation. + Version 1.9. + file read prediction routines + Copyright (C) Andrew Tridgell 1992-1995 + + 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. +*/ + +#include "includes.h" +#include "loadparm.h" + +extern int DEBUGLEVEL; + + +/* variables used by the read prediction module */ +static int rp_fd = -1; +static int rp_offset = 0; +static int rp_length = 0; +static int rp_alloced = 0; +static int rp_predict_fd = -1; +static int rp_predict_offset = 0; +static int rp_predict_length = 0; +static int rp_timeout = 5; +static time_t rp_time = 0; +static char *rp_buffer = NULL; +static BOOL predict_skip=False; +time_t smb_last_time=(time_t)0; + +/**************************************************************************** +handle read prediction on a file +****************************************************************************/ +int read_predict(int fd,int offset,char *buf,char **ptr,int num) +{ + int ret = 0; + int possible = rp_length - (offset - rp_offset); + + possible = MIN(possible,num); + + /* give data if possible */ + if (fd == rp_fd && + offset >= rp_offset && + possible>0 && + smb_last_time-rp_time < rp_timeout) + { + ret = possible; + if (buf) + memcpy(buf,rp_buffer + (offset-rp_offset),possible); + else + *ptr = rp_buffer + (offset-rp_offset); + DEBUG(5,("read-prediction gave %d bytes of %d\n",ret,num)); + } + + if (ret == num) { + predict_skip = True; + } else { + predict_skip = False; + + /* prepare the next prediction */ + rp_predict_fd = fd; + rp_predict_offset = offset + num; + rp_predict_length = num; + } + + if (ret < 0) ret = 0; + + return(ret); +} + +/**************************************************************************** +pre-read some data +****************************************************************************/ +void do_read_prediction() +{ + static int readsize = 0; + + if (predict_skip) return; + + if (rp_predict_fd == -1) + return; + + rp_fd = rp_predict_fd; + rp_offset = rp_predict_offset; + rp_length = 0; + + rp_predict_fd = -1; + + if (readsize == 0) { + readsize = lp_readsize(); + readsize = MAX(readsize,1024); + } + + rp_predict_length = MIN(rp_predict_length,2*readsize); + rp_predict_length = MAX(rp_predict_length,1024); + rp_offset = (rp_offset/1024)*1024; + rp_predict_length = (rp_predict_length/1024)*1024; + + if (rp_predict_length > rp_alloced) + { + rp_buffer = Realloc(rp_buffer,rp_predict_length); + rp_alloced = rp_predict_length; + if (!rp_buffer) + { + DEBUG(0,("can't allocate read-prediction buffer\n")); + rp_predict_fd = -1; + rp_fd = -1; + rp_alloced = 0; + return; + } + } + + if (lseek(rp_fd,rp_offset,SEEK_SET) != rp_offset) { + rp_fd = -1; + rp_predict_fd = -1; + return; + } + + rp_length = read(rp_fd,rp_buffer,rp_predict_length); + rp_time = time(NULL); + if (rp_length < 0) + rp_length = 0; +} + +/**************************************************************************** +invalidate read-prediction on a fd +****************************************************************************/ +void invalidate_read_prediction(int fd) +{ + if (rp_fd == fd) + rp_fd = -1; + if (rp_predict_fd == fd) + rp_predict_fd = -1; +} + -- cgit