mirror of
https://github.com/samba-team/samba.git
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9df203f876
Jeremy.
(This used to be commit ed5a1f70c6
)
989 lines
25 KiB
C
989 lines
25 KiB
C
/*
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Unix SMB/Netbios implementation.
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Version 1.9.
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Samba system utilities
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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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The idea is that this file will eventually have wrappers around all
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important system calls in samba. The aims are:
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- to enable easier porting by putting OS dependent stuff in here
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- to allow for hooks into other "pseudo-filesystems"
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- to allow easier integration of things like the japanese extensions
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- to support the philosophy of Samba to expose the features of
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the OS within the SMB model. In general whatever file/printer/variable
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expansions/etc make sense to the OS should be acceptable to Samba.
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*/
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/*******************************************************************
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A wrapper for usleep in case we don't have one.
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********************************************************************/
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int sys_usleep(long usecs)
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{
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#ifndef HAVE_USLEEP
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struct timeval tval;
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#endif
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/*
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* We need this braindamage as the glibc usleep
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* is not SPEC1170 complient... grumble... JRA.
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*/
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if(usecs < 0 || usecs > 1000000) {
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errno = EINVAL;
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return -1;
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}
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#if HAVE_USLEEP
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usleep(usecs);
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return 0;
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#else /* HAVE_USLEEP */
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/*
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* Fake it with select...
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*/
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tval.tv_sec = 0;
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tval.tv_usec = usecs/1000;
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select(0,NULL,NULL,NULL,&tval);
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return 0;
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#endif /* HAVE_USLEEP */
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}
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/*******************************************************************
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A stat() wrapper that will deal with 64 bit filesizes.
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********************************************************************/
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int sys_stat(const char *fname,SMB_STRUCT_STAT *sbuf)
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{
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int ret;
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#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_OFF64_T) && defined(HAVE_STAT64)
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ret = stat64(fname, sbuf);
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#else
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ret = stat(fname, sbuf);
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#endif
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/* we always want directories to appear zero size */
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if (ret == 0 && S_ISDIR(sbuf->st_mode)) sbuf->st_size = 0;
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return ret;
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}
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/*******************************************************************
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An fstat() wrapper that will deal with 64 bit filesizes.
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********************************************************************/
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int sys_fstat(int fd,SMB_STRUCT_STAT *sbuf)
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{
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int ret;
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#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_OFF64_T) && defined(HAVE_FSTAT64)
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ret = fstat64(fd, sbuf);
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#else
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ret = fstat(fd, sbuf);
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#endif
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/* we always want directories to appear zero size */
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if (ret == 0 && S_ISDIR(sbuf->st_mode)) sbuf->st_size = 0;
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return ret;
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}
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/*******************************************************************
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An lstat() wrapper that will deal with 64 bit filesizes.
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********************************************************************/
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int sys_lstat(const char *fname,SMB_STRUCT_STAT *sbuf)
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{
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int ret;
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#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_OFF64_T) && defined(HAVE_LSTAT64)
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ret = lstat64(fname, sbuf);
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#else
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ret = lstat(fname, sbuf);
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#endif
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/* we always want directories to appear zero size */
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if (ret == 0 && S_ISDIR(sbuf->st_mode)) sbuf->st_size = 0;
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return ret;
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}
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/*******************************************************************
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An ftruncate() wrapper that will deal with 64 bit filesizes.
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********************************************************************/
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int sys_ftruncate(int fd, SMB_OFF_T offset)
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{
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#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_OFF64_T) && defined(HAVE_FTRUNCATE64)
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return ftruncate64(fd, offset);
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#else
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return ftruncate(fd, offset);
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#endif
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}
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/*******************************************************************
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An lseek() wrapper that will deal with 64 bit filesizes.
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********************************************************************/
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SMB_OFF_T sys_lseek(int fd, SMB_OFF_T offset, int whence)
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{
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#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_OFF64_T) && defined(HAVE_LSEEK64)
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return lseek64(fd, offset, whence);
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#else
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return lseek(fd, offset, whence);
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#endif
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}
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/*******************************************************************
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An fseek() wrapper that will deal with 64 bit filesizes.
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********************************************************************/
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int sys_fseek(FILE *fp, SMB_OFF_T offset, int whence)
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{
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#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(LARGE_SMB_OFF_T) && defined(HAVE_FSEEK64)
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return fseek64(fp, offset, whence);
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#elif defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(LARGE_SMB_OFF_T) && defined(HAVE_FSEEKO64)
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return fseeko64(fp, offset, whence);
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#else
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return fseek(fp, offset, whence);
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#endif
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}
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/*******************************************************************
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An ftell() wrapper that will deal with 64 bit filesizes.
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********************************************************************/
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SMB_OFF_T sys_ftell(FILE *fp)
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{
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#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(LARGE_SMB_OFF_T) && defined(HAVE_FTELL64)
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return (SMB_OFF_T)ftell64(fp);
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#elif defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(LARGE_SMB_OFF_T) && defined(HAVE_FTELLO64)
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return (SMB_OFF_T)ftello64(fp);
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#else
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return (SMB_OFF_T)ftell(fp);
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#endif
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}
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/*******************************************************************
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A creat() wrapper that will deal with 64 bit filesizes.
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********************************************************************/
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int sys_creat(const char *path, mode_t mode)
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{
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#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_CREAT64)
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return creat64(path, mode);
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#else
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/*
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* If creat64 isn't defined then ensure we call a potential open64.
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* JRA.
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*/
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return sys_open(path, O_WRONLY | O_CREAT | O_TRUNC, mode);
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#endif
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}
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/*******************************************************************
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An open() wrapper that will deal with 64 bit filesizes.
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********************************************************************/
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int sys_open(const char *path, int oflag, mode_t mode)
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{
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#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_OPEN64)
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return open64(path, oflag, mode);
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#else
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return open(path, oflag, mode);
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#endif
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}
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/*******************************************************************
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An fopen() wrapper that will deal with 64 bit filesizes.
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********************************************************************/
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FILE *sys_fopen(const char *path, const char *type)
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{
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#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_FOPEN64)
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return fopen64(path, type);
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#else
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return fopen(path, type);
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#endif
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}
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/*******************************************************************
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A readdir wrapper that will deal with 64 bit filesizes.
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********************************************************************/
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SMB_STRUCT_DIRENT *sys_readdir(DIR *dirp)
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{
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#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_READDIR64)
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return readdir64(dirp);
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#else
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return readdir(dirp);
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#endif
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}
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/*******************************************************************
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The wait() calls vary between systems
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********************************************************************/
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int sys_waitpid(pid_t pid,int *status,int options)
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{
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#ifdef HAVE_WAITPID
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return waitpid(pid,status,options);
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#else /* HAVE_WAITPID */
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return wait4(pid, status, options, NULL);
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#endif /* HAVE_WAITPID */
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}
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/*******************************************************************
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system wrapper for getwd
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********************************************************************/
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char *sys_getwd(char *s)
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{
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char *wd;
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#ifdef HAVE_GETCWD
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wd = (char *)getcwd(s, sizeof (pstring));
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#else
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wd = (char *)getwd(s);
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#endif
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return wd;
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}
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/*******************************************************************
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system wrapper for symlink
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********************************************************************/
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int sys_symlink(const char *oldpath, const char *newpath)
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{
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#ifndef HAVE_SYMLINK
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errno = ENOSYS;
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return -1;
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#else
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return symlink(oldpath, newpath);
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#endif
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}
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/*******************************************************************
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system wrapper for readlink
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********************************************************************/
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int sys_readlink(const char *path, char *buf, size_t bufsiz)
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{
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#ifndef HAVE_READLINK
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errno = ENOSYS;
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return -1;
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#else
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return readlink(path, buf, bufsiz);
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#endif
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}
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/*******************************************************************
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chown isn't used much but OS/2 doesn't have it
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********************************************************************/
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int sys_chown(const char *fname,uid_t uid,gid_t gid)
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{
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#ifndef HAVE_CHOWN
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static int done;
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if (!done) {
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DEBUG(1,("WARNING: no chown!\n"));
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done=1;
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}
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#else
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return(chown(fname,uid,gid));
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#endif
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}
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/*******************************************************************
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os/2 also doesn't have chroot
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********************************************************************/
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int sys_chroot(const char *dname)
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{
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#ifndef HAVE_CHROOT
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static int done;
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if (!done) {
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DEBUG(1,("WARNING: no chroot!\n"));
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done=1;
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}
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errno = ENOSYS;
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return -1;
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#else
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return(chroot(dname));
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#endif
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}
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/**************************************************************************
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A wrapper for gethostbyname() that tries avoids looking up hostnames
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in the root domain, which can cause dial-on-demand links to come up for no
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apparent reason.
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****************************************************************************/
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struct hostent *sys_gethostbyname(const char *name)
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{
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#ifdef REDUCE_ROOT_DNS_LOOKUPS
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char query[256], hostname[256];
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char *domain;
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/* Does this name have any dots in it? If so, make no change */
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if (strchr_m(name, '.'))
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return(gethostbyname(name));
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/* Get my hostname, which should have domain name
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attached. If not, just do the gethostname on the
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original string.
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*/
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gethostname(hostname, sizeof(hostname) - 1);
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hostname[sizeof(hostname) - 1] = 0;
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if ((domain = strchr_m(hostname, '.')) == NULL)
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return(gethostbyname(name));
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/* Attach domain name to query and do modified query.
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If names too large, just do gethostname on the
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original string.
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*/
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if((strlen(name) + strlen(domain)) >= sizeof(query))
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return(gethostbyname(name));
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slprintf(query, sizeof(query)-1, "%s%s", name, domain);
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return(gethostbyname(query));
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#else /* REDUCE_ROOT_DNS_LOOKUPS */
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return(gethostbyname(name));
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#endif /* REDUCE_ROOT_DNS_LOOKUPS */
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}
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#if defined(HAVE_IRIX_SPECIFIC_CAPABILITIES)
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/**************************************************************************
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Try and abstract process capabilities (for systems that have them).
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****************************************************************************/
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static BOOL set_process_capability( uint32 cap_flag, BOOL enable )
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{
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if(cap_flag == KERNEL_OPLOCK_CAPABILITY)
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{
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cap_t cap = cap_get_proc();
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if (cap == NULL) {
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DEBUG(0,("set_process_capability: cap_get_proc failed. Error was %s\n",
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strerror(errno)));
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return False;
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}
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if(enable)
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cap->cap_effective |= CAP_NETWORK_MGT;
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else
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cap->cap_effective &= ~CAP_NETWORK_MGT;
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if (cap_set_proc(cap) == -1) {
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DEBUG(0,("set_process_capability: cap_set_proc failed. Error was %s\n",
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strerror(errno)));
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cap_free(cap);
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return False;
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}
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cap_free(cap);
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DEBUG(10,("set_process_capability: Set KERNEL_OPLOCK_CAPABILITY.\n"));
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}
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return True;
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}
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/**************************************************************************
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Try and abstract inherited process capabilities (for systems that have them).
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****************************************************************************/
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static BOOL set_inherited_process_capability( uint32 cap_flag, BOOL enable )
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{
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if(cap_flag == KERNEL_OPLOCK_CAPABILITY)
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{
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cap_t cap = cap_get_proc();
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if (cap == NULL) {
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DEBUG(0,("set_inherited_process_capability: cap_get_proc failed. Error was %s\n",
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strerror(errno)));
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return False;
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}
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if(enable)
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cap->cap_inheritable |= CAP_NETWORK_MGT;
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else
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cap->cap_inheritable &= ~CAP_NETWORK_MGT;
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if (cap_set_proc(cap) == -1) {
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DEBUG(0,("set_inherited_process_capability: cap_set_proc failed. Error was %s\n",
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strerror(errno)));
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cap_free(cap);
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return False;
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}
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cap_free(cap);
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DEBUG(10,("set_inherited_process_capability: Set KERNEL_OPLOCK_CAPABILITY.\n"));
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}
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return True;
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}
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#endif
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/****************************************************************************
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gain the oplock capability from the kernel if possible
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****************************************************************************/
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void oplock_set_capability(BOOL this_process, BOOL inherit)
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{
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#if HAVE_KERNEL_OPLOCKS_IRIX
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set_process_capability(KERNEL_OPLOCK_CAPABILITY,this_process);
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set_inherited_process_capability(KERNEL_OPLOCK_CAPABILITY,inherit);
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#endif
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}
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/**************************************************************************
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Wrapper for random().
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****************************************************************************/
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long sys_random(void)
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{
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#if defined(HAVE_RANDOM)
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return (long)random();
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#elif defined(HAVE_RAND)
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return (long)rand();
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#else
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DEBUG(0,("Error - no random function available !\n"));
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exit(1);
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#endif
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}
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/**************************************************************************
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Wrapper for srandom().
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****************************************************************************/
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void sys_srandom(unsigned int seed)
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{
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#if defined(HAVE_SRANDOM)
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srandom(seed);
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#elif defined(HAVE_SRAND)
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srand(seed);
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#else
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DEBUG(0,("Error - no srandom function available !\n"));
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exit(1);
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#endif
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}
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/**************************************************************************
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Returns equivalent to NGROUPS_MAX - using sysconf if needed.
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****************************************************************************/
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int groups_max(void)
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{
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#if defined(SYSCONF_SC_NGROUPS_MAX)
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int ret = sysconf(_SC_NGROUPS_MAX);
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return (ret == -1) ? NGROUPS_MAX : ret;
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#else
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return NGROUPS_MAX;
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#endif
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}
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/**************************************************************************
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Wrapper for getgroups. Deals with broken (int) case.
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****************************************************************************/
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int sys_getgroups(int setlen, gid_t *gidset)
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{
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#if !defined(HAVE_BROKEN_GETGROUPS)
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return getgroups(setlen, gidset);
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#else
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GID_T gid;
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GID_T *group_list;
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int i, ngroups;
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if(setlen == 0) {
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return getgroups(setlen, &gid);
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}
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/*
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* Broken case. We need to allocate a
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* GID_T array of size setlen.
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*/
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if(setlen < 0) {
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errno = EINVAL;
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return -1;
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}
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if (setlen == 0)
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setlen = groups_max();
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if((group_list = (GID_T *)malloc(setlen * sizeof(GID_T))) == NULL) {
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DEBUG(0,("sys_getgroups: Malloc fail.\n"));
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return -1;
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}
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if((ngroups = getgroups(setlen, group_list)) < 0) {
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int saved_errno = errno;
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free((char *)group_list);
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errno = saved_errno;
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return -1;
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}
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for(i = 0; i < ngroups; i++)
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gidset[i] = (gid_t)group_list[i];
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free((char *)group_list);
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return ngroups;
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#endif /* HAVE_BROKEN_GETGROUPS */
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}
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#ifdef HAVE_SETGROUPS
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/**************************************************************************
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Wrapper for setgroups. Deals with broken (int) case. Automatically used
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|
if we have broken getgroups.
|
|
****************************************************************************/
|
|
|
|
int sys_setgroups(int setlen, gid_t *gidset)
|
|
{
|
|
#if !defined(HAVE_BROKEN_GETGROUPS)
|
|
return setgroups(setlen, gidset);
|
|
#else
|
|
|
|
GID_T *group_list;
|
|
int i ;
|
|
|
|
if (setlen == 0)
|
|
return 0 ;
|
|
|
|
if (setlen < 0 || setlen > groups_max()) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Broken case. We need to allocate a
|
|
* GID_T array of size setlen.
|
|
*/
|
|
|
|
if((group_list = (GID_T *)malloc(setlen * sizeof(GID_T))) == NULL) {
|
|
DEBUG(0,("sys_setgroups: Malloc fail.\n"));
|
|
return -1;
|
|
}
|
|
|
|
for(i = 0; i < setlen; i++)
|
|
group_list[i] = (GID_T) gidset[i];
|
|
|
|
if(setgroups(setlen, group_list) != 0) {
|
|
int saved_errno = errno;
|
|
free((char *)group_list);
|
|
errno = saved_errno;
|
|
return -1;
|
|
}
|
|
|
|
free((char *)group_list);
|
|
return 0 ;
|
|
#endif /* HAVE_BROKEN_GETGROUPS */
|
|
}
|
|
|
|
#endif /* HAVE_SETGROUPS */
|
|
|
|
/*
|
|
* We only wrap pw_name and pw_passwd for now as these
|
|
* are the only potentially modified fields.
|
|
*/
|
|
|
|
/**************************************************************************
|
|
Helper function for getpwnam/getpwuid wrappers.
|
|
****************************************************************************/
|
|
|
|
struct saved_pw {
|
|
fstring pw_name;
|
|
fstring pw_passwd;
|
|
fstring pw_gecos;
|
|
pstring pw_dir;
|
|
pstring pw_shell;
|
|
struct passwd pass;
|
|
};
|
|
|
|
static struct saved_pw pw_mod; /* This is the structure returned - can be modified. */
|
|
static struct saved_pw pw_cache; /* This is the structure saved - used to check cache. */
|
|
|
|
static int num_lookups; /* Counter so we don't always use cache. */
|
|
#ifndef PW_RET_CACHE_MAX_LOOKUPS
|
|
#define PW_RET_CACHE_MAX_LOOKUPS 100
|
|
#endif
|
|
|
|
static void copy_pwent(struct saved_pw *dst, struct passwd *pass)
|
|
{
|
|
memcpy((char *)&dst->pass, pass, sizeof(struct passwd));
|
|
|
|
fstrcpy(dst->pw_name, pass->pw_name);
|
|
dst->pass.pw_name = dst->pw_name;
|
|
|
|
fstrcpy(dst->pw_passwd, pass->pw_passwd);
|
|
dst->pass.pw_passwd = dst->pw_passwd;
|
|
|
|
fstrcpy(dst->pw_gecos, pass->pw_gecos);
|
|
dst->pass.pw_gecos = dst->pw_gecos;
|
|
|
|
pstrcpy(dst->pw_dir, pass->pw_dir);
|
|
dst->pass.pw_dir = dst->pw_dir;
|
|
|
|
pstrcpy(dst->pw_shell, pass->pw_shell);
|
|
dst->pass.pw_shell = dst->pw_shell;
|
|
}
|
|
|
|
static struct passwd *setup_pwret(struct passwd *pass)
|
|
{
|
|
if (pass == NULL) {
|
|
/* Clear the caches. */
|
|
memset(&pw_cache, '\0', sizeof(struct saved_pw));
|
|
memset(&pw_mod, '\0', sizeof(struct saved_pw));
|
|
num_lookups = 0;
|
|
return NULL;
|
|
}
|
|
|
|
copy_pwent( &pw_mod, pass);
|
|
|
|
if (pass != &pw_cache.pass) {
|
|
|
|
/* If it's a cache miss we must also refill the cache. */
|
|
|
|
copy_pwent( &pw_cache, pass);
|
|
num_lookups = 1;
|
|
|
|
} else {
|
|
|
|
/* Cache hit. */
|
|
|
|
num_lookups++;
|
|
num_lookups = (num_lookups % PW_RET_CACHE_MAX_LOOKUPS);
|
|
}
|
|
|
|
return &pw_mod.pass;
|
|
}
|
|
|
|
/**************************************************************************
|
|
Wrappers for setpwent(), getpwent() and endpwent()
|
|
****************************************************************************/
|
|
|
|
void sys_setpwent(void)
|
|
{
|
|
setup_pwret(NULL); /* Clear cache. */
|
|
setpwent();
|
|
}
|
|
|
|
struct passwd *sys_getpwent(void)
|
|
{
|
|
return setup_pwret(getpwent());
|
|
}
|
|
|
|
void sys_endpwent(void)
|
|
{
|
|
setup_pwret(NULL); /* Clear cache. */
|
|
endpwent();
|
|
}
|
|
|
|
/**************************************************************************
|
|
Wrapper for getpwnam(). Always returns a static that can be modified.
|
|
****************************************************************************/
|
|
|
|
struct passwd *sys_getpwnam(const char *name)
|
|
{
|
|
if (!name || !name[0])
|
|
return NULL;
|
|
|
|
/* check for a cache hit first */
|
|
if (num_lookups && pw_cache.pass.pw_name && !strcmp(name, pw_cache.pass.pw_name)) {
|
|
return setup_pwret(&pw_cache.pass);
|
|
}
|
|
|
|
return setup_pwret(getpwnam(name));
|
|
}
|
|
|
|
/**************************************************************************
|
|
Wrapper for getpwuid(). Always returns a static that can be modified.
|
|
****************************************************************************/
|
|
|
|
struct passwd *sys_getpwuid(uid_t uid)
|
|
{
|
|
if (num_lookups && pw_cache.pass.pw_name && (uid == pw_cache.pass.pw_uid)) {
|
|
return setup_pwret(&pw_cache.pass);
|
|
}
|
|
|
|
return setup_pwret(getpwuid(uid));
|
|
}
|
|
|
|
/**************************************************************************
|
|
Extract a command into an arg list. Uses a static pstring for storage.
|
|
Caller frees returned arg list (which contains pointers into the static pstring).
|
|
****************************************************************************/
|
|
|
|
static char **extract_args(const char *command)
|
|
{
|
|
static pstring trunc_cmd;
|
|
char *ptr;
|
|
int argcl;
|
|
char **argl = NULL;
|
|
int i;
|
|
|
|
pstrcpy(trunc_cmd, command);
|
|
|
|
if(!(ptr = strtok(trunc_cmd, " \t"))) {
|
|
errno = EINVAL;
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Count the args.
|
|
*/
|
|
|
|
for( argcl = 1; ptr; ptr = strtok(NULL, " \t"))
|
|
argcl++;
|
|
|
|
if((argl = (char **)malloc((argcl + 1) * sizeof(char *))) == NULL)
|
|
return NULL;
|
|
|
|
/*
|
|
* Now do the extraction.
|
|
*/
|
|
|
|
pstrcpy(trunc_cmd, command);
|
|
|
|
ptr = strtok(trunc_cmd, " \t");
|
|
i = 0;
|
|
argl[i++] = ptr;
|
|
|
|
while((ptr = strtok(NULL, " \t")) != NULL)
|
|
argl[i++] = ptr;
|
|
|
|
argl[i++] = NULL;
|
|
return argl;
|
|
}
|
|
|
|
/**************************************************************************
|
|
Wrapper for fork. Ensures that mypid is reset. Used so we can write
|
|
a sys_getpid() that only does a system call *once*.
|
|
****************************************************************************/
|
|
|
|
static pid_t mypid = (pid_t)-1;
|
|
|
|
pid_t sys_fork(void)
|
|
{
|
|
pid_t forkret = fork();
|
|
|
|
if (forkret == (pid_t)0) /* Child - reset mypid so sys_getpid does a system call. */
|
|
mypid = (pid_t) -1;
|
|
|
|
return forkret;
|
|
}
|
|
|
|
/**************************************************************************
|
|
Wrapper for getpid. Ensures we only do a system call *once*.
|
|
****************************************************************************/
|
|
|
|
pid_t sys_getpid(void)
|
|
{
|
|
if (mypid == (pid_t)-1)
|
|
mypid = getpid();
|
|
|
|
return mypid;
|
|
}
|
|
|
|
/**************************************************************************
|
|
Wrapper for popen. Safer as it doesn't search a path.
|
|
Modified from the glibc sources.
|
|
modified by tridge to return a file descriptor. We must kick our FILE* habit
|
|
****************************************************************************/
|
|
|
|
typedef struct _popen_list
|
|
{
|
|
int fd;
|
|
pid_t child_pid;
|
|
struct _popen_list *next;
|
|
} popen_list;
|
|
|
|
static popen_list *popen_chain;
|
|
|
|
int sys_popen(const char *command)
|
|
{
|
|
int parent_end, child_end;
|
|
int pipe_fds[2];
|
|
popen_list *entry = NULL;
|
|
char **argl = NULL;
|
|
|
|
if (pipe(pipe_fds) < 0)
|
|
return -1;
|
|
|
|
parent_end = pipe_fds[0];
|
|
child_end = pipe_fds[1];
|
|
|
|
if (!*command) {
|
|
errno = EINVAL;
|
|
goto err_exit;
|
|
}
|
|
|
|
if((entry = (popen_list *)malloc(sizeof(popen_list))) == NULL)
|
|
goto err_exit;
|
|
|
|
ZERO_STRUCTP(entry);
|
|
|
|
/*
|
|
* Extract the command and args into a NULL terminated array.
|
|
*/
|
|
|
|
if(!(argl = extract_args(command)))
|
|
goto err_exit;
|
|
|
|
entry->child_pid = sys_fork();
|
|
|
|
if (entry->child_pid == -1) {
|
|
goto err_exit;
|
|
}
|
|
|
|
if (entry->child_pid == 0) {
|
|
|
|
/*
|
|
* Child !
|
|
*/
|
|
|
|
int child_std_end = STDOUT_FILENO;
|
|
popen_list *p;
|
|
|
|
close(parent_end);
|
|
if (child_end != child_std_end) {
|
|
dup2 (child_end, child_std_end);
|
|
close (child_end);
|
|
}
|
|
|
|
/*
|
|
* POSIX.2: "popen() shall ensure that any streams from previous
|
|
* popen() calls that remain open in the parent process are closed
|
|
* in the new child process."
|
|
*/
|
|
|
|
for (p = popen_chain; p; p = p->next)
|
|
close(p->fd);
|
|
|
|
execv(argl[0], argl);
|
|
_exit (127);
|
|
}
|
|
|
|
/*
|
|
* Parent.
|
|
*/
|
|
|
|
close (child_end);
|
|
free((char *)argl);
|
|
|
|
/* Link into popen_chain. */
|
|
entry->next = popen_chain;
|
|
popen_chain = entry;
|
|
entry->fd = parent_end;
|
|
|
|
return entry->fd;
|
|
|
|
err_exit:
|
|
|
|
if(entry)
|
|
free((char *)entry);
|
|
if(argl)
|
|
free((char *)argl);
|
|
close(pipe_fds[0]);
|
|
close(pipe_fds[1]);
|
|
return -1;
|
|
}
|
|
|
|
/**************************************************************************
|
|
Wrapper for pclose. Modified from the glibc sources.
|
|
****************************************************************************/
|
|
int sys_pclose(int fd)
|
|
{
|
|
int wstatus;
|
|
popen_list **ptr = &popen_chain;
|
|
popen_list *entry = NULL;
|
|
pid_t wait_pid;
|
|
int status = -1;
|
|
|
|
/* Unlink from popen_chain. */
|
|
for ( ; *ptr != NULL; ptr = &(*ptr)->next) {
|
|
if ((*ptr)->fd == fd) {
|
|
entry = *ptr;
|
|
*ptr = (*ptr)->next;
|
|
status = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (status < 0 || close(entry->fd) < 0)
|
|
return -1;
|
|
|
|
/*
|
|
* As Samba is catching and eating child process
|
|
* exits we don't really care about the child exit
|
|
* code, a -1 with errno = ECHILD will do fine for us.
|
|
*/
|
|
|
|
do {
|
|
wait_pid = sys_waitpid (entry->child_pid, &wstatus, 0);
|
|
} while (wait_pid == -1 && errno == EINTR);
|
|
|
|
free((char *)entry);
|
|
|
|
if (wait_pid == -1)
|
|
return -1;
|
|
return wstatus;
|
|
}
|
|
|
|
/**************************************************************************
|
|
Wrappers for dlopen, dlsym, dlclose.
|
|
****************************************************************************/
|
|
|
|
void *sys_dlopen(const char *name, int flags)
|
|
{
|
|
#ifdef HAVE_LIBDL
|
|
return dlopen(name, flags);
|
|
#else
|
|
return NULL;
|
|
#endif
|
|
}
|
|
|
|
void *sys_dlsym(void *handle, char *symbol)
|
|
{
|
|
#ifdef HAVE_LIBDL
|
|
return dlsym(handle, symbol);
|
|
#else
|
|
return NULL;
|
|
#endif
|
|
}
|
|
|
|
int sys_dlclose (void *handle)
|
|
{
|
|
#ifdef HAVE_LIBDL
|
|
return dlclose(handle);
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
const char *sys_dlerror(void)
|
|
{
|
|
#ifdef HAVE_LIBDL
|
|
return dlerror();
|
|
#else
|
|
return NULL;
|
|
#endif
|
|
}
|