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