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428
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1 /* Copyright (C) 1985, 86, 87, 93, 94, 96 Free Software Foundation, Inc.
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2
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3 This file is part of GNU Emacs.
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4
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5 GNU Emacs is free software; you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation; either version 2, or (at your option)
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8 any later version.
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9
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10 GNU Emacs is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
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15 You should have received a copy of the GNU General Public License
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16 along with GNU Emacs; see the file COPYING. If not, write to
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17 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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18 Boston, MA 02111-1307, USA. */
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19
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20 /* Synced with FSF 20.2 */
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21
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22 #include <config.h>
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23 #include "lisp.h"
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24
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25 #include "buffer.h"
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26 #include <paths.h>
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27
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28 #include "sysfile.h"
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29 #include "sysdir.h"
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30 #include "syspwd.h"
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31 #include "syssignal.h" /* for kill */
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32
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33 Lisp_Object Qask_user_about_supersession_threat;
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34 Lisp_Object Qask_user_about_lock;
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444
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35 int inhibit_clash_detection;
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428
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36
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37 #ifdef CLASH_DETECTION
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442
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38
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428
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39 /* The strategy: to lock a file FN, create a symlink .#FN in FN's
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40 directory, with link data `user@host.pid'. This avoids a single
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41 mount (== failure) point for lock files.
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42
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43 When the host in the lock data is the current host, we can check if
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44 the pid is valid with kill.
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442
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45
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428
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46 Otherwise, we could look at a separate file that maps hostnames to
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47 reboot times to see if the remote pid can possibly be valid, since we
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48 don't want Emacs to have to communicate via pipes or sockets or
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49 whatever to other processes, either locally or remotely; rms says
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50 that's too unreliable. Hence the separate file, which could
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51 theoretically be updated by daemons running separately -- but this
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52 whole idea is unimplemented; in practice, at least in our
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53 environment, it seems such stale locks arise fairly infrequently, and
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54 Emacs' standard methods of dealing with clashes suffice.
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55
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56 We use symlinks instead of normal files because (1) they can be
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57 stored more efficiently on the filesystem, since the kernel knows
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58 they will be small, and (2) all the info about the lock can be read
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59 in a single system call (readlink). Although we could use regular
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60 files to be useful on old systems lacking symlinks, nowadays
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61 virtually all such systems are probably single-user anyway, so it
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62 didn't seem worth the complication.
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63
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64 Similarly, we don't worry about a possible 14-character limit on
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65 file names, because those are all the same systems that don't have
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66 symlinks.
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442
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67
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428
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68 This is compatible with the locking scheme used by Interleaf (which
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69 has contributed this implementation for Emacs), and was designed by
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70 Ethan Jacobson, Kimbo Mundy, and others.
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442
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71
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428
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72 --karl@cs.umb.edu/karl@hq.ileaf.com. */
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73
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442
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74 /* Note that muleization is provided by using mule-encapsulated
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75 versions of the system calls we use like symlink(), unlink(), etc... */
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76
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428
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77
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78 /* Here is the structure that stores information about a lock. */
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79
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80 typedef struct
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81 {
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82 char *user;
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83 char *host;
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84 unsigned long pid;
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85 } lock_info_type;
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86
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87 /* When we read the info back, we might need this much more,
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88 enough for decimal representation plus null. */
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89 #define LOCK_PID_MAX (4 * sizeof (unsigned long))
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90
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91 /* Free the two dynamically-allocated pieces in PTR. */
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92 #define FREE_LOCK_INFO(i) do { xfree ((i).user); xfree ((i).host); } while (0)
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93
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94 /* Write the name of the lock file for FN into LFNAME. Length will be
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95 that of FN plus two more for the leading `.#' plus one for the null. */
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96 #define MAKE_LOCK_NAME(lock, file) \
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442
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97 (lock = (char *) alloca (XSTRING_LENGTH (file) + 2 + 1), \
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98 fill_in_lock_file_name ((Bufbyte *) (lock), (file)))
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428
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99
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100 static void
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442
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101 fill_in_lock_file_name (Bufbyte *lockfile, Lisp_Object fn)
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428
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102 {
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442
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103 Bufbyte *file_name = XSTRING_DATA (fn);
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104 Bufbyte *p;
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105 size_t dirlen;
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428
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106
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442
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107 for (p = file_name + XSTRING_LENGTH (fn) - 1;
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108 p > file_name && !IS_ANY_SEP (p[-1]);
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109 p--)
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110 ;
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111 dirlen = p - file_name;
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428
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112
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442
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113 memcpy (lockfile, file_name, dirlen);
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114 p = lockfile + dirlen;
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115 *(p++) = '.';
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116 *(p++) = '#';
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117 memcpy (p, file_name + dirlen, XSTRING_LENGTH (fn) - dirlen + 1);
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428
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118 }
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119
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120 /* Lock the lock file named LFNAME.
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121 If FORCE is nonzero, we do so even if it is already locked.
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122 Return 1 if successful, 0 if not. */
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123
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124 static int
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442
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125 lock_file_1 (char *lfname, int force)
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428
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126 {
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442
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127 /* Does not GC. */
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128 int err;
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129 char *lock_info_str;
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428
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130 char *host_name;
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442
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131 char *user_name = user_login_name (NULL);
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428
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132
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442
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133 if (user_name == NULL)
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428
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134 user_name = "";
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442
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135
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136 if (STRINGP (Vsystem_name))
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137 host_name = (char *) XSTRING_DATA (Vsystem_name);
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428
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138 else
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139 host_name = "";
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442
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140
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428
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141 lock_info_str = (char *)alloca (strlen (user_name) + strlen (host_name)
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142 + LOCK_PID_MAX + 5);
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143
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144 sprintf (lock_info_str, "%s@%s.%lu", user_name, host_name,
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145 (unsigned long) getpid ());
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146
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147 err = symlink (lock_info_str, lfname);
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442
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148 if (err != 0 && errno == EEXIST && force)
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428
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149 {
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150 unlink (lfname);
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151 err = symlink (lock_info_str, lfname);
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152 }
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153
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154 return err == 0;
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155 }
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156
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157 /* Return 0 if nobody owns the lock file LFNAME or the lock is obsolete,
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158 1 if another process owns it (and set OWNER (if non-null) to info),
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159 2 if the current process owns it,
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160 or -1 if something is wrong with the locking mechanism. */
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161
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162 static int
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163 current_lock_owner (lock_info_type *owner, char *lfname)
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164 {
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442
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165 /* Does not GC. */
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166 int len, ret;
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428
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167 int local_owner = 0;
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168 char *at, *dot;
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169 char *lfinfo = 0;
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170 int bufsize = 50;
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171 /* Read arbitrarily-long contents of symlink. Similar code in
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172 file-symlink-p in fileio.c. */
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173 do
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174 {
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175 bufsize *= 2;
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176 lfinfo = (char *) xrealloc (lfinfo, bufsize);
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177 len = readlink (lfname, lfinfo, bufsize);
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178 }
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179 while (len >= bufsize);
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442
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180
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428
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181 /* If nonexistent lock file, all is well; otherwise, got strange error. */
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182 if (len == -1)
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183 {
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184 xfree (lfinfo);
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185 return errno == ENOENT ? 0 : -1;
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186 }
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187
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188 /* Link info exists, so `len' is its length. Null terminate. */
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189 lfinfo[len] = 0;
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442
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190
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428
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191 /* Even if the caller doesn't want the owner info, we still have to
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192 read it to determine return value, so allocate it. */
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193 if (!owner)
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194 {
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195 owner = (lock_info_type *) alloca (sizeof (lock_info_type));
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196 local_owner = 1;
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197 }
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442
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198
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428
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199 /* Parse USER@HOST.PID. If can't parse, return -1. */
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200 /* The USER is everything before the first @. */
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201 at = strchr (lfinfo, '@');
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202 dot = strrchr (lfinfo, '.');
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203 if (!at || !dot) {
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204 xfree (lfinfo);
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205 return -1;
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206 }
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207 len = at - lfinfo;
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208 owner->user = (char *) xmalloc (len + 1);
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209 strncpy (owner->user, lfinfo, len);
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210 owner->user[len] = 0;
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442
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211
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428
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212 /* The PID is everything after the last `.'. */
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213 owner->pid = atoi (dot + 1);
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214
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215 /* The host is everything in between. */
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216 len = dot - at - 1;
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217 owner->host = (char *) xmalloc (len + 1);
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218 strncpy (owner->host, at + 1, len);
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219 owner->host[len] = 0;
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220
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221 /* We're done looking at the link info. */
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222 xfree (lfinfo);
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442
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223
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428
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224 /* On current host? */
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442
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225 if (STRINGP (Fsystem_name ())
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226 && strcmp (owner->host, (char *) XSTRING_DATA (Fsystem_name ())) == 0)
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428
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227 {
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228 if (owner->pid == getpid ())
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229 ret = 2; /* We own it. */
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230 else if (owner->pid > 0
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231 && (kill (owner->pid, 0) >= 0 || errno == EPERM))
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232 ret = 1; /* An existing process on this machine owns it. */
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233 /* The owner process is dead or has a strange pid (<=0), so try to
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234 zap the lockfile. */
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235 else if (unlink (lfname) < 0)
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236 ret = -1;
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237 else
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238 ret = 0;
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239 }
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240 else
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241 { /* If we wanted to support the check for stale locks on remote machines,
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242 here's where we'd do it. */
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243 ret = 1;
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244 }
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442
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245
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428
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246 /* Avoid garbage. */
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247 if (local_owner || ret <= 0)
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248 {
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249 FREE_LOCK_INFO (*owner);
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250 }
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251 return ret;
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252 }
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253
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254 /* Lock the lock named LFNAME if possible.
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255 Return 0 in that case.
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256 Return positive if some other process owns the lock, and info about
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257 that process in CLASHER.
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258 Return -1 if cannot lock for any other reason. */
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259
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260 static int
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261 lock_if_free (lock_info_type *clasher, char *lfname)
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262 {
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442
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263 /* Does not GC. */
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428
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264 if (lock_file_1 (lfname, 0) == 0)
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265 {
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266 int locker;
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267
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268 if (errno != EEXIST)
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269 return -1;
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442
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270
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428
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271 locker = current_lock_owner (clasher, lfname);
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272 if (locker == 2)
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273 {
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274 FREE_LOCK_INFO (*clasher);
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275 return 0; /* We ourselves locked it. */
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276 }
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277 else if (locker == 1)
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278 return 1; /* Someone else has it. */
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279
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280 return -1; /* Something's wrong. */
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281 }
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282 return 0;
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283 }
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284
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285 /* lock_file locks file FN,
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286 meaning it serves notice on the world that you intend to edit that file.
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287 This should be done only when about to modify a file-visiting
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288 buffer previously unmodified.
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289 Do not (normally) call this for a buffer already modified,
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290 as either the file is already locked, or the user has already
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291 decided to go ahead without locking.
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292
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293 When this returns, either the lock is locked for us,
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294 or the user has said to go ahead without locking.
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295
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296 If the file is locked by someone else, this calls
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297 ask-user-about-lock (a Lisp function) with two arguments,
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298 the file name and info about the user who did the locking.
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299 This function can signal an error, or return t meaning
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300 take away the lock, or return nil meaning ignore the lock. */
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301
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302 void
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303 lock_file (Lisp_Object fn)
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304 {
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442
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305 /* This function can GC. GC checked 7-11-00 ben */
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428
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306 /* dmoore - and can destroy current_buffer and all sorts of other
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307 mean nasty things with pointy teeth. If you call this make sure
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308 you protect things right. */
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442
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309 /* Somebody updated the code in this function and removed the previous
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428
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310 comment. -slb */
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311
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312 register Lisp_Object attack, orig_fn;
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313 register char *lfname, *locker;
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314 lock_info_type lock_info;
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444
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315 struct gcpro gcpro1, gcpro2, gcpro3;
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316 Lisp_Object old_current_buffer;
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428
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317 Lisp_Object subject_buf;
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318
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444
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319 if (inhibit_clash_detection)
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320 return;
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321
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322 XSETBUFFER (old_current_buffer, current_buffer);
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446
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323 subject_buf = Qnil;
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444
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324 GCPRO3 (fn, subject_buf, old_current_buffer);
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428
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325 orig_fn = fn;
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326 fn = Fexpand_file_name (fn, Qnil);
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327
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328 /* Create the name of the lock-file for file fn */
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329 MAKE_LOCK_NAME (lfname, fn);
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330
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331 /* See if this file is visited and has changed on disk since it was
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332 visited. */
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333 {
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334 subject_buf = get_truename_buffer (orig_fn);
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335 if (!NILP (subject_buf)
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336 && NILP (Fverify_visited_file_modtime (subject_buf))
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337 && !NILP (Ffile_exists_p (fn)))
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442
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338 call1_in_buffer (XBUFFER (subject_buf),
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339 Qask_user_about_supersession_threat, fn);
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|
428
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340 }
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341
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|
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342 /* Try to lock the lock. */
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444
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343 if (current_buffer != XBUFFER (old_current_buffer)
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344 || lock_if_free (&lock_info, lfname) <= 0)
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|
|
345 /* Return now if we have locked it, or if lock creation failed
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|
346 or current buffer is killed. */
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|
428
|
347 goto done;
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|
348
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|
|
349 /* Else consider breaking the lock */
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350 locker = (char *) alloca (strlen (lock_info.user) + strlen (lock_info.host)
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351 + LOCK_PID_MAX + 9);
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352 sprintf (locker, "%s@%s (pid %lu)", lock_info.user, lock_info.host,
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|
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353 lock_info.pid);
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354 FREE_LOCK_INFO (lock_info);
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|
442
|
355
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|
428
|
356 attack = call2_in_buffer (BUFFERP (subject_buf) ? XBUFFER (subject_buf) :
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|
|
357 current_buffer, Qask_user_about_lock , fn,
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|
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358 build_string (locker));
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|
444
|
359 if (!NILP (attack) && current_buffer == XBUFFER (old_current_buffer))
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428
|
360 /* User says take the lock */
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|
|
361 {
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|
|
362 lock_file_1 (lfname, 1);
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|
363 goto done;
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364 }
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|
|
365 /* User says ignore the lock */
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|
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366 done:
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|
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367 UNGCPRO;
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|
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368 }
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369
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|
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370 void
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|
|
371 unlock_file (Lisp_Object fn)
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|
|
372 {
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|
442
|
373 /* This can GC */
|
|
428
|
374 register char *lfname;
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|
442
|
375 struct gcpro gcpro1;
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|
|
376
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|
|
377 GCPRO1 (fn);
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|
428
|
378
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|
|
379 fn = Fexpand_file_name (fn, Qnil);
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|
|
380
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|
|
381 MAKE_LOCK_NAME (lfname, fn);
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|
|
382
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|
|
383 if (current_lock_owner (0, lfname) == 2)
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|
|
384 unlink (lfname);
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|
442
|
385
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|
|
386 UNGCPRO;
|
|
428
|
387 }
|
|
|
388
|
|
|
389 void
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|
442
|
390 unlock_all_files (void)
|
|
428
|
391 {
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|
|
392 register Lisp_Object tail;
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|
|
393
|
|
434
|
394 for (tail = Vbuffer_alist; CONSP (tail); tail = XCDR (tail))
|
|
428
|
395 {
|
|
442
|
396 struct buffer *b = XBUFFER (XCDR (XCAR (tail)));
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428
|
397 if (STRINGP (b->file_truename) && BUF_SAVE_MODIFF (b) < BUF_MODIFF (b))
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|
|
398 unlock_file (b->file_truename);
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|
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399 }
|
|
|
400 }
|
|
|
401
|
|
|
402 DEFUN ("lock-buffer", Flock_buffer, 0, 1, 0, /*
|
|
442
|
403 Lock FILE, if current buffer is modified.
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|
|
404 FILE defaults to current buffer's visited file,
|
|
428
|
405 or else nothing is done if current buffer isn't visiting a file.
|
|
|
406 */
|
|
442
|
407 (file))
|
|
428
|
408 {
|
|
|
409 if (NILP (file))
|
|
|
410 file = current_buffer->file_truename;
|
|
|
411 CHECK_STRING (file);
|
|
|
412 if (BUF_SAVE_MODIFF (current_buffer) < BUF_MODIFF (current_buffer)
|
|
|
413 && !NILP (file))
|
|
|
414 lock_file (file);
|
|
|
415 return Qnil;
|
|
|
416 }
|
|
|
417
|
|
|
418 DEFUN ("unlock-buffer", Funlock_buffer, 0, 0, 0, /*
|
|
|
419 Unlock the file visited in the current buffer,
|
|
|
420 if it should normally be locked.
|
|
|
421 */
|
|
|
422 ())
|
|
|
423 {
|
|
|
424 /* This function can GC */
|
|
|
425 /* dmoore - and can destroy current_buffer and all sorts of other
|
|
|
426 mean nasty things with pointy teeth. If you call this make sure
|
|
|
427 you protect things right. */
|
|
|
428
|
|
|
429 if (BUF_SAVE_MODIFF (current_buffer) < BUF_MODIFF (current_buffer)
|
|
|
430 && STRINGP (current_buffer->file_truename))
|
|
|
431 unlock_file (current_buffer->file_truename);
|
|
|
432 return Qnil;
|
|
|
433 }
|
|
|
434
|
|
|
435 /* Unlock the file visited in buffer BUFFER. */
|
|
|
436
|
|
|
437
|
|
|
438 void
|
|
|
439 unlock_buffer (struct buffer *buffer)
|
|
|
440 {
|
|
|
441 /* This function can GC */
|
|
|
442 /* dmoore - and can destroy current_buffer and all sorts of other
|
|
|
443 mean nasty things with pointy teeth. If you call this make sure
|
|
|
444 you protect things right. */
|
|
|
445 if (BUF_SAVE_MODIFF (buffer) < BUF_MODIFF (buffer)
|
|
|
446 && STRINGP (buffer->file_truename))
|
|
|
447 unlock_file (buffer->file_truename);
|
|
|
448 }
|
|
|
449
|
|
|
450 DEFUN ("file-locked-p", Ffile_locked_p, 0, 1, 0, /*
|
|
442
|
451 Return nil if the FILENAME is not locked,
|
|
428
|
452 t if it is locked by you, else a string of the name of the locker.
|
|
|
453 */
|
|
442
|
454 (filename))
|
|
428
|
455 {
|
|
|
456 Lisp_Object ret;
|
|
|
457 register char *lfname;
|
|
|
458 int owner;
|
|
|
459 lock_info_type locker;
|
|
442
|
460 struct gcpro gcpro1;
|
|
|
461
|
|
|
462 GCPRO1 (filename);
|
|
428
|
463
|
|
|
464 filename = Fexpand_file_name (filename, Qnil);
|
|
|
465
|
|
|
466 MAKE_LOCK_NAME (lfname, filename);
|
|
|
467
|
|
|
468 owner = current_lock_owner (&locker, lfname);
|
|
|
469 if (owner <= 0)
|
|
|
470 ret = Qnil;
|
|
|
471 else if (owner == 2)
|
|
|
472 ret = Qt;
|
|
|
473 else
|
|
|
474 ret = build_string (locker.user);
|
|
|
475
|
|
|
476 if (owner > 0)
|
|
|
477 FREE_LOCK_INFO (locker);
|
|
|
478
|
|
442
|
479 UNGCPRO;
|
|
|
480
|
|
428
|
481 return ret;
|
|
|
482 }
|
|
|
483
|
|
|
484
|
|
|
485 /* Initialization functions. */
|
|
|
486
|
|
|
487 void
|
|
|
488 syms_of_filelock (void)
|
|
|
489 {
|
|
|
490 /* This function can GC */
|
|
|
491 DEFSUBR (Funlock_buffer);
|
|
|
492 DEFSUBR (Flock_buffer);
|
|
|
493 DEFSUBR (Ffile_locked_p);
|
|
|
494
|
|
|
495 defsymbol (&Qask_user_about_supersession_threat,
|
|
|
496 "ask-user-about-supersession-threat");
|
|
|
497 defsymbol (&Qask_user_about_lock, "ask-user-about-lock");
|
|
|
498 }
|
|
|
499
|
|
444
|
500 void
|
|
|
501 vars_of_filelock (void)
|
|
|
502 {
|
|
|
503 DEFVAR_BOOL ("inhibit-clash-detection", &inhibit_clash_detection /*
|
|
|
504 Non-nil inhibits creation of lock file to detect clash.
|
|
|
505 */);
|
|
|
506 inhibit_clash_detection = 0;
|
|
|
507 }
|
|
428
|
508
|
|
|
509 #endif /* CLASH_DETECTION */
|
