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1 /* Copyright (C) 1985, 1986, 1987, 1992, 1993, 1994
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2 Free Software Foundation, Inc.
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3
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4 This file is part of XEmacs.
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5
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6 XEmacs is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by the
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8 Free Software Foundation; either version 2, or (at your option) any
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9 later version.
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10
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11 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with XEmacs; see the file COPYING. If not, write to
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18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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19 Boston, MA 02111-1307, USA. */
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20
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21 /* Synched up with: FSF 19.30. */
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22
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23 #include <config.h>
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24 #include "lisp.h"
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25
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26 #include "buffer.h"
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27 #include "paths.h"
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28
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29 #include "sysfile.h"
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30 #include "sysdir.h"
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31 #include "syspwd.h"
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32 #include "syssignal.h" /* for kill */
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33
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34
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35 #ifdef CLASH_DETECTION
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36
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37 /* FSFmacs uses char *lock_dir and char *superlock_file instead of
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38 the Lisp variables we use. */
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39
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40 /* The name of the directory in which we keep lock files, with a '/'
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41 appended. */
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42 Lisp_Object Vlock_directory;
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43
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44 #if 0 /* FSFmacs */
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45 /* Look in startup.el */
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46 /* The name of the file in the lock directory which is used to
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47 arbitrate access to the entire directory. */
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48 #define SUPERLOCK_NAME "!!!SuperLock!!!"
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49 #endif
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50
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51 /* The name of the superlock file. This is SUPERLOCK_NAME appended to
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52 Vlock_directory. */
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53 Lisp_Object Vsuperlock_file;
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54
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55 Lisp_Object Qask_user_about_supersession_threat;
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56 Lisp_Object Qask_user_about_lock;
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57
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58 static void lock_superlock (CONST char *lfname);
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59 static int lock_file_1 (CONST char *lfname, int mode);
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60 static int lock_if_free (CONST char *lfname);
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61 static int current_lock_owner (CONST char *);
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62 static int current_lock_owner_1 (CONST char *);
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63
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64 /* Set LOCK to the name of the lock file for the filename FILE.
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65 char *LOCK; Lisp_Object FILE;
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66
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67 MAKE_LOCK_NAME assumes you have already verified that Vlock_directory
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68 is a string. */
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69
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70 #ifndef HAVE_LONG_FILE_NAMES
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71
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72 #define MAKE_LOCK_NAME(lock, file) \
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73 (lock = (char *) alloca (14 + string_length (XSTRING (Vlock_directory)) + \
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74 1), \
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75 fill_in_lock_short_file_name (lock, (file)))
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76
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77 static void
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78 fill_in_lock_short_file_name (REGISTER char *lockfile, REGISTER Lisp_Object fn)
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79 {
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80 REGISTER union
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81 {
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82 unsigned int word [2];
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83 unsigned char byte [8];
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84 } crc;
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85 REGISTER unsigned char *p, new;
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86
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87 CHECK_STRING (Vlock_directory);
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88
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89 /* 7-bytes cyclic code for burst correction on byte-by-byte basis.
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90 the used polynomial is D^7 + D^6 + D^3 +1. pot@cnuce.cnr.it */
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91
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92 crc.word[0] = crc.word[1] = 0;
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93
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94 for (p = string_data (XSTRING (fn)); new = *p++; )
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95 {
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96 new += crc.byte[6];
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97 crc.byte[6] = crc.byte[5] + new;
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98 crc.byte[5] = crc.byte[4];
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99 crc.byte[4] = crc.byte[3];
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100 crc.byte[3] = crc.byte[2] + new;
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101 crc.byte[2] = crc.byte[1];
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102 crc.byte[1] = crc.byte[0];
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103 crc.byte[0] = new;
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104 }
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105
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106 {
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107 int need_slash = 0;
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108
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109 /* in case lock-directory doesn't end in / */
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110 if (string_byte (XSTRING (Vlock_directory),
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111 string_length (XSTRING (Vlock_directory)) - 1) != '/')
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112 need_slash = 1;
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113
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114 sprintf (lockfile, "%s%s%.2x%.2x%.2x%.2x%.2x%.2x%.2x",
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115 (char *) string_data (XSTRING (Vlock_directory)),
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116 need_slash ? "/" : "",
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117 crc.byte[0], crc.byte[1], crc.byte[2], crc.byte[3],
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118 crc.byte[4], crc.byte[5], crc.byte[6]);
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119 }
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120 }
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121
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122 #else /* defined HAVE_LONG_FILE_NAMES */
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123
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124 /* +2 for terminating null and possible extra slash */
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125 #define MAKE_LOCK_NAME(lock, file) \
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126 (lock = (char *) alloca (string_length (XSTRING (file)) + \
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127 string_length (XSTRING (Vlock_directory)) + 2), \
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128 fill_in_lock_file_name (lock, (file)))
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129
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130 static void
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131 fill_in_lock_file_name (REGISTER char *lockfile, REGISTER Lisp_Object fn)
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132 /* fn must be a Lisp_String! */
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133 {
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134 REGISTER char *p;
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135
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136 CHECK_STRING (Vlock_directory);
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137
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138 strcpy (lockfile, (char *) string_data (XSTRING (Vlock_directory)));
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139
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140 p = lockfile + strlen (lockfile);
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141
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142 if (p == lockfile /* lock-directory is empty?? */
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143 || *(p - 1) != '/') /* in case lock-directory doesn't end in / */
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144 {
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145 *p = '/';
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146 p++;
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147 }
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148
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149 strcpy (p, (char *) string_data (XSTRING (fn)));
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150
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151 for (; *p; p++)
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152 {
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153 if (*p == '/')
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154 *p = '!';
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155 }
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156 }
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157 #endif /* !defined HAVE_LONG_FILE_NAMES */
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158
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159 static Lisp_Object
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160 lock_file_owner_name (CONST char *lfname)
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161 {
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162 struct stat s;
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163 struct passwd *the_pw = 0;
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164
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165 if (lstat (lfname, &s) == 0)
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166 the_pw = getpwuid (s.st_uid);
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167 return (the_pw == 0 ? Qnil : build_string (the_pw->pw_name));
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168 }
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169
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170
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171 /* lock_file locks file fn,
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172 meaning it serves notice on the world that you intend to edit that file.
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173 This should be done only when about to modify a file-visiting
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174 buffer previously unmodified.
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175 Do not (normally) call lock_buffer for a buffer already modified,
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176 as either the file is already locked, or the user has already
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177 decided to go ahead without locking.
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178
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179 When lock_buffer returns, either the lock is locked for us,
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180 or the user has said to go ahead without locking.
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181
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182 If the file is locked by someone else, lock_buffer calls
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183 ask-user-about-lock (a Lisp function) with two arguments,
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184 the file name and the name of the user who did the locking.
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185 This function can signal an error, or return t meaning
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186 take away the lock, or return nil meaning ignore the lock. */
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187
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188 /* The lock file name is the file name with "/" replaced by "!"
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189 and put in the Emacs lock directory. */
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190 /* (ie., /ka/king/junk.tex -> /!/!ka!king!junk.tex). */
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191
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192 /* If HAVE_LONG_FILE_NAMES is not defined, the lock file name is the hex
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193 representation of a 14-bytes CRC generated from the file name
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194 and put in the Emacs lock directory (not very nice, but it works).
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195 (ie., /ka/king/junk.tex -> /!/12a82c62f1c6da). */
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196
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197 void
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198 lock_file (Lisp_Object fn)
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199 {
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200 /* This function can GC */
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201 REGISTER Lisp_Object attack, orig_fn;
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202 REGISTER char *lfname;
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203 struct gcpro gcpro1, gcpro2;
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204 Lisp_Object subject_buf = Qnil;
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205
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206 if (NILP (Vlock_directory) || NILP (Vsuperlock_file))
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207 return;
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208 CHECK_STRING (fn);
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209 CHECK_STRING (Vlock_directory);
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210
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211 GCPRO2 (fn, subject_buf);
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212 orig_fn = fn;
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213 fn = Fexpand_file_name (fn, Qnil);
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214
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215 /* Create the name of the lock-file for file fn */
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216 MAKE_LOCK_NAME (lfname, fn);
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217
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218 /* See if this file is visited and has changed on disk since it was
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219 visited. */
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220 subject_buf = Fget_file_buffer (fn);
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221 if (!NILP (subject_buf)
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222 && NILP (Fverify_visited_file_modtime (subject_buf))
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223 && !NILP (Ffile_exists_p (fn)))
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224 call1_in_buffer (XBUFFER (subject_buf),
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225 Qask_user_about_supersession_threat, fn);
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226
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227 /* Try to lock the lock. */
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228 if (lock_if_free (lfname) <= 0)
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229 /* Return now if we have locked it, or if lock dir does not exist */
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230 goto done;
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231
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232 /* Else consider breaking the lock */
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233 attack = call2_in_buffer (BUFFERP (subject_buf) ? XBUFFER (subject_buf) :
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234 current_buffer, Qask_user_about_lock, fn,
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235 lock_file_owner_name (lfname));
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236 if (!NILP (attack))
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237 /* User says take the lock */
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238 {
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239 CHECK_STRING (Vsuperlock_file);
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240 lock_superlock (lfname);
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241 lock_file_1 (lfname, O_WRONLY);
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242 unlink ((char *) string_data (XSTRING (Vsuperlock_file)));
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243 goto done;
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244 }
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245 /* User says ignore the lock */
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246 done:
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247 UNGCPRO;
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248 }
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249
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250
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251 /* Lock the lock file named LFNAME.
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252 If MODE is O_WRONLY, we do so even if it is already locked.
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253 If MODE is O_WRONLY | O_EXCL | O_CREAT, we do so only if it is free.
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254 Return 1 if successful, 0 if not. */
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255
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256 static int
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257 lock_file_1 (CONST char *lfname, int mode)
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258 {
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259 REGISTER int fd;
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260 char buf[20];
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261
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262 if ((fd = open (lfname, mode, 0666)) >= 0)
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263 {
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264 #ifdef USG
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265 chmod (lfname, 0666);
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266 #else
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267 fchmod (fd, 0666);
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268 #endif
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269 sprintf (buf, "%ld ", (long) getpid ());
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270 write (fd, buf, strlen (buf));
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271 close (fd);
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272 return 1;
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273 }
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274 else
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275 return 0;
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276 }
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277
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278 /* Lock the lock named LFNAME if possible.
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279 Return 0 in that case.
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280 Return positive if lock is really locked by someone else.
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281 Return -1 if cannot lock for any other reason. */
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282
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283 static int
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284 lock_if_free (CONST char *lfname)
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285 {
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286 REGISTER int clasher;
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287
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288 while (lock_file_1 (lfname, O_WRONLY | O_EXCL | O_CREAT) == 0)
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289 {
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290 if (errno != EEXIST)
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291 return -1;
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292 clasher = current_lock_owner (lfname);
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293 if (clasher != 0)
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294 if (clasher != getpid ())
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295 return (clasher);
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296 else return (0);
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297 /* Try again to lock it */
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298 }
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299 return 0;
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300 }
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301
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302 /* Return the pid of the process that claims to own the lock file LFNAME,
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303 or 0 if nobody does or the lock is obsolete,
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304 or -1 if something is wrong with the locking mechanism. */
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305
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306 static int
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307 current_lock_owner (CONST char *lfname)
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308 {
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309 int owner = current_lock_owner_1 (lfname);
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310 if (owner == 0 && errno == ENOENT)
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311 return (0);
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312 /* Is it locked by a process that exists? */
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313 if (owner != 0 && (kill (owner, 0) >= 0 || errno == EPERM))
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314 return (owner);
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315 if (unlink (lfname) < 0)
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316 return (-1);
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317 return (0);
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318 }
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319
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320 static int
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321 current_lock_owner_1 (CONST char *lfname)
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322 {
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323 REGISTER int fd;
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324 char buf[20];
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325 int tem;
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326
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327 fd = open (lfname, O_RDONLY, 0666);
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328 if (fd < 0)
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329 return 0;
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330 tem = read (fd, buf, sizeof buf);
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331 close (fd);
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332 return (tem <= 0 ? 0 : atoi (buf));
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333 }
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334
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335
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336 void
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337 unlock_file (Lisp_Object fn)
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338 {
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339 REGISTER char *lfname;
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340 if (NILP (Vlock_directory) || NILP (Vsuperlock_file)) return;
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341 CHECK_STRING (fn);
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342 CHECK_STRING (Vlock_directory);
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343 CHECK_STRING (Vsuperlock_file);
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344
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345 fn = Fexpand_file_name (fn, Qnil);
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346
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347 MAKE_LOCK_NAME (lfname, fn);
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348
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349 lock_superlock (lfname);
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350
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351 if (current_lock_owner_1 (lfname) == getpid ())
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352 unlink (lfname);
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353
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354 unlink ((char *) string_data (XSTRING (Vsuperlock_file)));
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355 }
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356
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357 static void
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358 lock_superlock (CONST char *lfname)
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359 {
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360 REGISTER int i, fd;
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361 DIR *lockdir;
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362
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363 for (i = -20; i < 0 &&
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364 (fd = open ((char *) string_data (XSTRING (Vsuperlock_file)),
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365 O_WRONLY | O_EXCL | O_CREAT, 0666)) < 0;
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366 i++)
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367 {
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368 if (errno != EEXIST)
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369 return;
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370
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371 /* This seems to be necessary to prevent Emacs from hanging when the
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372 competing process has already deleted the superlock, but it's still
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373 in the NFS cache. So we force NFS to synchronize the cache. */
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374 lockdir = opendir ((char *) string_data (XSTRING (Vlock_directory)));
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375 if (lockdir)
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376 closedir (lockdir);
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377
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378 emacs_sleep (1);
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379 }
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380 if (fd >= 0)
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381 {
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382 #ifdef USG
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383 chmod ((char *) string_data (XSTRING (Vsuperlock_file)), 0666);
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384 #else
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385 fchmod (fd, 0666);
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386 #endif
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387 write (fd, lfname, strlen (lfname));
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388 close (fd);
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389 }
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390 }
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391
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392 void
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393 unlock_all_files (void)
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394 {
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395 REGISTER Lisp_Object tail;
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396 REGISTER struct buffer *b;
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397
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398 for (tail = Vbuffer_alist; GC_CONSP (tail);
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399 tail = XCDR (tail))
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400 {
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401 b = XBUFFER (XCDR (XCAR (tail)));
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402 if (STRINGP (b->file_truename) &&
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403 BUF_SAVE_MODIFF (b) < BUF_MODIFF (b))
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404 unlock_file (b->file_truename);
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405 }
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406 }
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407
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408
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409 DEFUN ("lock-buffer", Flock_buffer, Slock_buffer,
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410 0, 1, 0 /*
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411 Lock FILE, if current buffer is modified.
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412 FILE defaults to current buffer's visited file,
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413 or else nothing is done if current buffer isn't visiting a file.
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414 */ )
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415 (fn)
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416 Lisp_Object fn;
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417 {
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418 /* This function can GC */
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419 if (NILP (fn))
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420 fn = current_buffer->file_truename;
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421 CHECK_STRING (fn);
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422 if (BUF_SAVE_MODIFF (current_buffer) < BUF_MODIFF (current_buffer)
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423 && !NILP (fn))
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424 lock_file (fn);
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425 return Qnil;
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426 }
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427
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428 DEFUN ("unlock-buffer", Funlock_buffer, Sunlock_buffer,
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429 0, 0, 0 /*
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430 Unlock the file visited in the current buffer,
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|
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431 if it should normally be locked.
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|
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432 */ )
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|
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433 ()
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434 {
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435 if (BUF_SAVE_MODIFF (current_buffer) < BUF_MODIFF (current_buffer)
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436 && STRINGP (current_buffer->file_truename))
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437 unlock_file (current_buffer->file_truename);
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|
438 return Qnil;
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|
|
439 }
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|
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440
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|
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441
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442 /* Unlock the file visited in buffer BUFFER. */
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443
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|
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444 void
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|
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445 unlock_buffer (struct buffer *buffer)
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|
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446 {
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|
|
447 if (BUF_SAVE_MODIFF (buffer) < BUF_MODIFF (buffer)
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|
|
448 && STRINGP (buffer->file_truename))
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|
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449 unlock_file (buffer->file_truename);
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|
|
450 }
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|
|
451
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|
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452 DEFUN ("file-locked-p", Ffile_locked_p, Sfile_locked_p, 0, 1, 0 /*
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|
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453 Return nil if the FILENAME is not locked,
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|
|
454 t if it is locked by you, else a string of the name of the locker.
|
|
|
455 */ )
|
|
|
456 (fn)
|
|
|
457 Lisp_Object fn;
|
|
|
458 {
|
|
|
459 /* This function can GC */
|
|
|
460 REGISTER char *lfname;
|
|
|
461 int owner;
|
|
|
462
|
|
|
463 if (NILP (Vlock_directory) || NILP (Vsuperlock_file))
|
|
|
464 return Qnil;
|
|
|
465 CHECK_STRING (Vlock_directory);
|
|
|
466
|
|
|
467 fn = Fexpand_file_name (fn, Qnil);
|
|
|
468
|
|
|
469 MAKE_LOCK_NAME (lfname, fn);
|
|
|
470
|
|
|
471 owner = current_lock_owner (lfname);
|
|
|
472 if (owner <= 0)
|
|
|
473 return (Qnil);
|
|
|
474 else if (owner == getpid ())
|
|
|
475 return (Qt);
|
|
|
476
|
|
|
477 return (lock_file_owner_name (lfname));
|
|
|
478 }
|
|
|
479
|
|
|
480 void
|
|
|
481 syms_of_filelock (void)
|
|
|
482 {
|
|
|
483 /* This function can GC */
|
|
|
484 defsubr (&Sunlock_buffer);
|
|
|
485 defsubr (&Slock_buffer);
|
|
|
486 defsubr (&Sfile_locked_p);
|
|
|
487
|
|
|
488 defsymbol (&Qask_user_about_supersession_threat,
|
|
|
489 "ask-user-about-supersession-threat");
|
|
|
490 defsymbol (&Qask_user_about_lock, "ask-user-about-lock");
|
|
|
491 }
|
|
|
492
|
|
|
493 void
|
|
|
494 vars_of_filelock (void)
|
|
|
495 {
|
|
|
496 DEFVAR_LISP ("lock-directory", &Vlock_directory /*
|
|
|
497 Don't change this
|
|
|
498 */ );
|
|
|
499 DEFVAR_LISP ("superlock-file", &Vsuperlock_file /*
|
|
|
500 Don't change this
|
|
|
501 */ );
|
|
|
502 }
|
|
|
503
|
|
|
504 void
|
|
|
505 complex_vars_of_filelock (void)
|
|
|
506 {
|
|
|
507 #ifdef PATH_LOCK
|
|
|
508 Vlock_directory =
|
|
|
509 Ffile_name_as_directory (build_string (PATH_LOCK));
|
|
|
510 #else
|
|
|
511 Vlock_directory = Qnil;
|
|
|
512 #endif
|
|
|
513 #ifdef PATH_SUPERLOCK
|
|
|
514 Vsuperlock_file =
|
|
|
515 Ffile_name_as_directory (build_string (PATH_SUPERLOCK));
|
|
|
516 #else
|
|
|
517 Vsuperlock_file = Qnil;
|
|
|
518 #endif
|
|
|
519 /* All the rest done dynamically by startup.el */
|
|
|
520 }
|
|
|
521
|
|
|
522 #endif /* CLASH_DETECTION */
|
