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/*
Copyright (C) Andrew Tridgell 1998
Copyright (C) 2002 by Martin Pool
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.
*/
/**
* @file syscall.c
*
* Syscall wrappers to ensure that nothing gets done in dry_run mode
* and to handle system peculiarities.
**/
#include "rsync.h"
extern int dry_run;
extern int read_only;
extern int list_only;
extern int preserve_perms;
#define RETURN_ERROR_IF(x,e) \
do { \
if (x) { \
errno = (e); \
return -1; \
} \
} while (0)
#define RETURN_ERROR_IF_RO_OR_LO RETURN_ERROR_IF(read_only || list_only, EROFS)
int do_unlink(char *fname)
{
if (dry_run) return 0;
RETURN_ERROR_IF_RO_OR_LO;
return unlink(fname);
}
int do_symlink(char *fname1, char *fname2)
{
if (dry_run) return 0;
RETURN_ERROR_IF_RO_OR_LO;
return symlink(fname1, fname2);
}
#if HAVE_LINK
int do_link(char *fname1, char *fname2)
{
if (dry_run) return 0;
RETURN_ERROR_IF_RO_OR_LO;
return link(fname1, fname2);
}
#endif
int do_lchown(const char *path, uid_t owner, gid_t group)
{
if (dry_run) return 0;
RETURN_ERROR_IF_RO_OR_LO;
return lchown(path, owner, group);
}
#if HAVE_MKNOD
int do_mknod(char *pathname, mode_t mode, dev_t dev)
{
if (dry_run) return 0;
RETURN_ERROR_IF_RO_OR_LO;
return mknod(pathname, mode, dev);
}
#endif
int do_rmdir(char *pathname)
{
if (dry_run) return 0;
RETURN_ERROR_IF_RO_OR_LO;
return rmdir(pathname);
}
int do_open(char *pathname, int flags, mode_t mode)
{
if (flags != O_RDONLY) {
RETURN_ERROR_IF(dry_run, 0);
RETURN_ERROR_IF_RO_OR_LO;
}
return open(pathname, flags | O_BINARY, mode);
}
#if HAVE_CHMOD
int do_chmod(const char *path, mode_t mode)
{
int code;
if (dry_run) return 0;
RETURN_ERROR_IF_RO_OR_LO;
code = chmod(path, mode);
if (code != 0 && preserve_perms)
return code;
return 0;
}
#endif
int do_rename(char *fname1, char *fname2)
{
if (dry_run) return 0;
RETURN_ERROR_IF_RO_OR_LO;
return rename(fname1, fname2);
}
void trim_trailing_slashes(char *name)
{
int l;
/* Some BSD systems cannot make a directory if the name
* contains a trailing slash.
* <http://www.opensource.apple.com/bugs/X/BSD%20Kernel/2734739.html> */
/* Don't change empty string; and also we can't improve on
* "/" */
l = strlen(name);
while (l > 1) {
if (name[--l] != '/')
break;
name[l] = '\0';
}
}
int do_mkdir(char *fname, mode_t mode)
{
if (dry_run) return 0;
RETURN_ERROR_IF_RO_OR_LO;
trim_trailing_slashes(fname);
return mkdir(fname, mode);
}
/* like mkstemp but forces permissions */
int do_mkstemp(char *template, mode_t perms)
{
RETURN_ERROR_IF(dry_run, 0);
RETURN_ERROR_IF(read_only, EROFS);
#if defined(HAVE_SECURE_MKSTEMP) && defined(HAVE_FCHMOD)
{
int fd = mkstemp(template);
if (fd == -1)
return -1;
if (fchmod(fd, perms) != 0 && preserve_perms) {
int errno_save = errno;
close(fd);
unlink(template);
errno = errno_save;
return -1;
}
return fd;
}
#else
if (!mktemp(template))
return -1;
return do_open(template, O_RDWR|O_EXCL|O_CREAT, perms);
#endif
}
int do_stat(const char *fname, STRUCT_STAT *st)
{
#if HAVE_OFF64_T
return stat64(fname, st);
#else
return stat(fname, st);
#endif
}
#if SUPPORT_LINKS
int do_lstat(const char *fname, STRUCT_STAT *st)
{
#if HAVE_OFF64_T
return lstat64(fname, st);
#else
return lstat(fname, st);
#endif
}
#endif
int do_fstat(int fd, STRUCT_STAT *st)
{
#if HAVE_OFF64_T
return fstat64(fd, st);
#else
return fstat(fd, st);
#endif
}
OFF_T do_lseek(int fd, OFF_T offset, int whence)
{
#if HAVE_OFF64_T
off64_t lseek64();
return lseek64(fd, offset, whence);
#else
return lseek(fd, offset, whence);
#endif
}
#ifdef USE_MMAP
void *do_mmap(void *start, int len, int prot, int flags, int fd, OFF_T offset)
{
#if HAVE_OFF64_T
return mmap64(start, len, prot, flags, fd, offset);
#else
return mmap(start, len, prot, flags, fd, offset);
#endif
}
#endif
char *d_name(struct dirent *di)
{
#if HAVE_BROKEN_READDIR
return (di->d_name - 2);
#else
return di->d_name;
#endif
}
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