syscall.c

   1 /*
   2    Copyright (C) Andrew Tridgell 1998
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software
  16    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17 */
  18
  19 /*
  20   syscall wrappers to ensure that nothing gets done in dry_run mode
  21   */
  22
  23 #include "rsync.h"
  24
  25 extern int dry_run;
  26 extern int read_only;
  27 extern int list_only;
  28
  29 #define CHECK_RO if (read_only || list_only) {errno = EROFS; return -1;}
  30
  31 int do_unlink(char *fname)
  32 {
  33         if (dry_run) return 0;
  34         CHECK_RO
  35         return unlink(fname);
  36 }
  37
  38 int do_symlink(char *fname1, char *fname2)
  39 {
  40         if (dry_run) return 0;
  41         CHECK_RO
  42         return symlink(fname1, fname2);
  43 }
  44
  45 #if HAVE_LINK
  46 int do_link(char *fname1, char *fname2)
  47 {
  48         if (dry_run) return 0;
  49         CHECK_RO
  50         return link(fname1, fname2);
  51 }
  52 #endif
  53
  54 int do_lchown(const char *path, uid_t owner, gid_t group)
  55 {
  56         if (dry_run) return 0;
  57         CHECK_RO
  58         return lchown(path, owner, group);
  59 }
  60
  61 #if HAVE_MKNOD
  62 int do_mknod(char *pathname, mode_t mode, dev_t dev)
  63 {
  64         if (dry_run) return 0;
  65         CHECK_RO
  66         return mknod(pathname, mode, dev);
  67 }
  68 #endif
  69
  70 int do_rmdir(char *pathname)
  71 {
  72         if (dry_run) return 0;
  73         CHECK_RO
  74         return rmdir(pathname);
  75 }
  76
  77 int do_open(char *pathname, int flags, mode_t mode)
  78 {
  79         if (flags != O_RDONLY) {
  80             if (dry_run) return -1;
  81             CHECK_RO
  82         }
  83 #ifdef O_BINARY
  84         /* for Windows */
  85         flags |= O_BINARY;
  86 #endif
  87         /* some systems can't handle a double / */
  88         if (pathname[0] == '/' && pathname[1] == '/') pathname++;
  89
  90         return open(pathname, flags, mode);
  91 }
  92
  93 #if HAVE_CHMOD
  94 int do_chmod(const char *path, mode_t mode)
  95 {
  96         if (dry_run) return 0;
  97         CHECK_RO
  98         return chmod(path, mode);
  99 }
 100 #endif
 101
 102 int do_rename(char *fname1, char *fname2)
 103 {
 104         if (dry_run) return 0;
 105         CHECK_RO
 106         return rename(fname1, fname2);
 107 }
 108
 109 int do_mkdir(char *fname, mode_t mode)
 110 {
 111         if (dry_run) return 0;
 112         CHECK_RO
 113         return mkdir(fname, mode);
 114 }
 115
 116 /* like mkstemp but forces permissions */
 117 int do_mkstemp(char *template, mode_t perms)
 118 {
 119         if (dry_run) return -1;
 120         if (read_only) {errno = EROFS; return -1;}
 121
 122 #if defined(HAVE_SECURE_MKSTEMP) && defined(HAVE_FCHMOD)
 123         {
 124                 int fd = mkstemp(template);
 125                 if (fd == -1) return -1;
 126                 if (fchmod(fd, perms) != 0) {
 127                         close(fd);
 128                         unlink(template);
 129                         return -1;
 130                 }
 131                 return fd;
 132         }
 133 #else
 134         if (!mktemp(template)) return -1;
 135         return open(template, O_RDWR|O_EXCL|O_CREAT, perms);
 136 #endif
 137 }
 138
 139 int do_stat(const char *fname, STRUCT_STAT *st)
 140 {
 141 #if HAVE_OFF64_T
 142         return stat64(fname, st);
 143 #else
 144         return stat(fname, st);
 145 #endif
 146 }
 147
 148 #if SUPPORT_LINKS
 149 int do_lstat(const char *fname, STRUCT_STAT *st)
 150 {
 151 #if HAVE_OFF64_T
 152         return lstat64(fname, st);
 153 #else
 154         return lstat(fname, st);
 155 #endif
 156 }
 157 #endif
 158
 159 int do_fstat(int fd, STRUCT_STAT *st)
 160 {
 161 #if HAVE_OFF64_T
 162         return fstat64(fd, st);
 163 #else
 164         return fstat(fd, st);
 165 #endif
 166 }
 167
 168 OFF_T do_lseek(int fd, OFF_T offset, int whence)
 169 {
 170 #if HAVE_OFF64_T
 171         off64_t lseek64();
 172         return lseek64(fd, offset, whence);
 173 #else
 174         return lseek(fd, offset, whence);
 175 #endif
 176 }
 177
 178 #ifdef USE_MMAP
 179 void *do_mmap(void *start, int len, int prot, int flags, int fd, OFF_T offset)
 180 {
 181 #if HAVE_OFF64_T
 182         return mmap64(start, len, prot, flags, fd, offset);
 183 #else
 184         return mmap(start, len, prot, flags, fd, offset);
 185 #endif
 186 }
 187 #endif
 188
 189 char *d_name(struct dirent *di)
 190 {
 191 #if HAVE_BROKEN_READDIR
 192         return (di->d_name - 2);
 193 #else
 194         return di->d_name;
 195 #endif
 196 }