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0
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1 /* lock.c - universal locking routines */
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2 #ifndef lint
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3 static char ident[] = "@(#)$Id$";
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4 #endif
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5 /* compile-time priority:
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6 * MAILLOCK or LIBLOCKFILE use if defined
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7 * LOCKF use if defined
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8 * FCNTL use if SYS5 defined and LOCKF not defined
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9 * FLOCK use if BSD42 defined and LOCKF and SYS5 not defined
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10 */
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11
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12 #ifdef MMDFONLY
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13 #define LOCKONLY
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14 #endif
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15
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16 #include "../h/mh.h"
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17 #include <stdio.h>
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18 #ifndef LOCKONLY
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19 #include "../h/strings.h"
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20 #include "mts.h"
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21 #else /* LOCKONLY */
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22 #include "strings.h"
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23 #ifdef MMDFONLY
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24 #include "mmdfonly.h"
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25 #include "mts.h"
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26 #else /* not MMDFONLY */
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27 #include "lockonly.h"
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28 #endif /* not MMDFONLY */
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29 #endif /* LOCKONLY */
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30 #include <sys/types.h>
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31 #include <sys/stat.h>
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32 #ifdef SVR4
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33 #ifndef LOCKF
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34 #define LOCKF
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35 #endif
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36 #include <unistd.h>
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37 #endif /* SVR4 */
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38 #ifdef LOCKF
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39 #include <sys/errno.h>
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40 #include <sys/file.h>
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41 #ifndef F_ULOCK
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42 #ifdef UNISTD
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43 #include <unistd.h>
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44 #else /* UNISTD */
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45 #include <sys/fcntl.h>
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46 #endif /* UNISTD */
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47 #endif
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48 #endif /* LOCKF */
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49 #if defined(_AIX) || defined(AUX)
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50 #include <sys/file.h>
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51 #endif
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52 #if defined(__386BSD__) || defined(BSD44)
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53 #include <fcntl.h>
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54 #endif
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55 #ifdef _AIX
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56 #include <sys/time.h>
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57 #include <time.h>
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58 #else
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59 #ifdef BSD42
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60 #include <sys/time.h>
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61 #else /* BSD42 */
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62 #include <time.h>
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63 #endif /* BSD42 */
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64 #endif
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65
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66 #ifdef SYS5
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67 #define u_short ushort
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68 #define u_long ulong
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69 #endif
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70
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71
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72 #if defined(SYS5) && !defined(_AIX)
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73 #define index strchr
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74 #define rindex strrchr
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75 #endif
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76 #ifdef BSD42
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77 #define FLOCK /* LOCKF will override this, if defined */
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78 #endif
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79
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80 #ifdef __CYGWIN32__
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81 #include <errno.h>
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82 #endif
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83 extern int errno;
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84
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85 #ifdef LOCKONLY
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86 #ifndef MMDFONLY
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87 char *lockldir = "/usr/spool/locks";
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88 #endif /* not MMDFONLY */
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89 #endif /* LOCKONLY */
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90
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91 #ifdef MAILLOCK
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92 /* Both "mts.h" and <maillock.h> defines MAILDIR */
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93 #undef MAILDIR
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94 #include <maillock.h>
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95 static int is_default_spool();
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96 #undef LIBLOCKFILE
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97 #else /* MAILLOCK */
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98 #ifdef LIBLOCKFILE
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99 #define LOCK_LIBLOCKFILE 1
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100 #define LOCK_B_LKOPEN 2
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101 char *lockname_from_fd();
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102 #endif
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103 #endif /* MAILLOCK */
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104
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105 static int b_lkopen(), lockit(), f_lkopen();
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106 static lockname(), timerON(), timerOFF();
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107
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108 time_t time ();
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109 char *mktemp ();
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110
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111 /* */
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112
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113 int lkopen (file, access)
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114 register char *file;
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115 register int access;
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116 {
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117 mts_init ("mts");
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118 switch (lockstyle) {
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119 case LOK_UNIX:
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120 #ifdef MAILLOCK
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121 if (is_default_spool (file))
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122 return f_lkopen (file, access);
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123 /* else fall */
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124 #else /* MAILLOCK */
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125 #if defined(FLOCK) || defined(LOCKF) || defined(FCNTL) || defined(LIBLOCKFILE)
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126 return f_lkopen (file, access);
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127 #endif
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128 #endif /* MAILLOCK */
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129
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130 default:
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131 return b_lkopen (file, access);
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132 }
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133 }
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134
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135 /* */
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136
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137 static int b_lkopen (file, access)
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138 register char *file;
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139 register int access;
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140 {
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141 register int i,
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142 j;
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143 time_t curtime;
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144 char curlock[BUFSIZ],
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145 tmplock[BUFSIZ];
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146 struct stat st;
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147
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148 if (stat (file, &st) == NOTOK)
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149 return NOTOK;
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150 lockname (curlock, tmplock, file, (int) st.st_dev, (int) st.st_ino);
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151
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152 for (i = 0;;)
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153 switch (lockit (tmplock, curlock)) {
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154 case OK:
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155 if ((i = open (file, access)) == NOTOK) {
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156 j = errno;
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157 (void) unlink (curlock);
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158 errno = j;
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159 }
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160 #ifdef LIBLOCKFILE
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161 timerON (curlock, i, LOCK_B_LKOPEN);
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162 #else
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163 timerON (curlock, i);
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164 #endif
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165 return i;
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166
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167 case NOTOK:
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168 if (stat (curlock, &st) == NOTOK) {
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169 if (i++ > 5)
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170 return NOTOK;
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171 sleep (5);
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172 break;
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173 }
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174
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175 i = 0;
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176 (void) time (&curtime);
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177 if (curtime < st.st_ctime + 60L)
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178 sleep (5);
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179 else
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180 (void) unlink (curlock);
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181 break;
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182 }
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183 }
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184
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185
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186 static int lockit (tmp, file)
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187 register char *tmp,
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188 *file;
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189 {
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190 register int fd;
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191
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192 if ((fd = creat (tmp, 0400)) == NOTOK)
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193 return NOTOK;
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194 #if defined(hpux) || defined(ncr)
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195 write(fd, "MH lock\n",8);
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196 #endif /* hpux */
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197 (void) close (fd);
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198
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199 fd = link (tmp, file);
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200 (void) unlink (tmp);
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201
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202 return (fd != NOTOK ? OK : NOTOK);
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203 }
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204
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205 /* */
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206
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207 static lockname (curlock, tmplock, file, dev, ino)
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208 register char *curlock,
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209 *tmplock,
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210 *file;
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211 register int dev,
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212 ino;
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213 {
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214 register char *bp,
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215 *cp;
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216
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217 bp = curlock;
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218 if ((cp = rindex (file, '/')) == NULL || *++cp == 0)
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219 cp = file;
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220 if (lockldir == NULL || *lockldir == 0) {
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221 if (cp != file) {
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222 (void) sprintf (bp, "%.*s", cp - file, file);
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223 bp += strlen (bp);
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224 }
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225 }
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226 else {
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227 (void) sprintf (bp, "%s/", lockldir);
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228 bp += strlen (bp);
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229 }
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230
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231 switch (lockstyle) {
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232 case LOK_BELL:
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233 default:
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234 (void) sprintf (bp, "%s.lock", cp);
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235 break;
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236
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237 case LOK_MMDF:
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238 (void) sprintf (bp, "LCK%05d.%05d", dev, ino);
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239 break;
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240 }
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241
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242 if (tmplock) {
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243 if ((cp = rindex (curlock, '/')) == NULL || *++cp == 0)
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244 (void) strcpy (tmplock, ",LCK.XXXXXX");
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245 else
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246 (void) sprintf (tmplock, "%.*s,LCK.XXXXXX",
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247 cp - curlock, curlock);
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248 (void) unlink (mktemp (tmplock));
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249 }
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250 }
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251
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252 /* */
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253
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254 #if defined(BSD42) || defined(SVR4)
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255 #include <sys/file.h>
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256 #if defined(SUN40) || defined(SVR4)
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257 #include <sys/fcntl.h>
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258 #endif
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259 #else
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260 #ifdef FCNTL
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261 #include <fcntl.h>
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262 #endif
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263 #endif
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264
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265 #ifdef MAILLOCK
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266
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267 static int f_lkopen (file, access)
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268 register char *file;
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269 register int access;
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270 {
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271 register int fd;
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272
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273 if (maillock (getusr (), 5) == L_SUCCESS) {
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274 if ((fd = open (file, access | O_NDELAY)) == NOTOK)
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275 return NOTOK;
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276 return fd;
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277 }
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278
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279 return NOTOK;
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280 }
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281
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282 #else /* not MAILLOCK */
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283 #ifdef LIBLOCKFILE
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284 #include <lockfile.h>
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285 #include <limits.h>
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286
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287 static int f_lkopen (file, access)
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288 register char *file;
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289 register int access;
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290 {
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291 int r, fd;
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292 char mlockfile[PATH_MAX];
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293
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294 snprintf(mlockfile, PATH_MAX, "%s.lock", file);
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295 r = lockfile_create(mlockfile, 5, 0);
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296 if (r != 0)
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297 return NOTOK;
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298 fd = open(file, access | O_NDELAY);
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299 if (fd == -1)
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300 return NOTOK;
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301 /* we have to set up a timer so we can touch the lockfile occasionally */
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302 timerON(mlockfile, fd, LOCK_LIBLOCKFILE);
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303 /* NB: it's OK to pass mlockfile as timerON immediately copies it
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304 * and we then use the copy in all lockfile_foo() operations.
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305 */
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306 return fd;
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307 }
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308
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309 #else /* not LIBLOCKFILE */
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310 #if defined(FLOCK) || defined(LOCKF) || defined(FCNTL)
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311
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312 static int f_lkopen (file, access)
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313 register char *file;
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314 register int access;
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315 {
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316 register int fd,
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317 i,
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318 j;
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319 #ifdef FCNTL
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320 struct flock buf;
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321 #endif /* FCNTL */
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322
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323 for (i = 0; i < 5; i++) {
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324 #if defined(LOCKF) || defined(FCNTL)
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325 j = access;
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326 access &= ~O_APPEND; /* make sure we open at the beginning */
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327 if ((access & 03) == O_RDONLY) {
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328 /* We MUST have write permission or lockf/fcntl() won't work */
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329 /* (Stupid eh?) */
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330 access &= ~O_RDONLY;
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331 access |= O_RDWR;
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332 }
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333 #endif /* LOCKF || FCNTL */
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334 if ((fd = open (file, access | O_NDELAY)) == NOTOK)
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335 return NOTOK;
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336 #ifndef LOCKF
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337 #ifndef FLOCK
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338 #ifndef FCNTL
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339 /* should be an error? */
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340 #else /* FCNTL */
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341 buf.l_type = F_WRLCK;
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342 buf.l_whence = 0;
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343 buf.l_start = 0;
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344 buf.l_len = 0;
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345 if (fcntl (fd, F_SETLK, &buf) != NOTOK)
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346 return fd;
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347 #endif
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348 #else /* FLOCK */
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349 if (flock (fd, LOCK_EX | LOCK_NB) != NOTOK)
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350 return fd;
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351 #endif
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352 #else /* LOCKF */
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353 if (lockf (fd, F_TLOCK, 0L) != NOTOK) {
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354 /* see if we should be at the end */
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355 if (j & O_APPEND)
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356 #ifdef SVR4
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357 lseek (fd, (off_t)0, SEEK_END);
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358 #else
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359 lseek (fd, (off_t)0, L_XTND);
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360 #endif
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361 return fd;
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362 }
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363 /* Fix errno - lockf screws it */
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364 if (errno == EACCES)
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365 errno = EWOULDBLOCK;
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366 #endif
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367 j = errno;
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368 (void) close (fd);
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369
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370 sleep (5);
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371 }
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372
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373 (void) close (fd);
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374 errno = j;
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375 return NOTOK;
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376 }
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377 #endif /* FLOCK || LOCKF || FCNTL */
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378 #endif /* not LIBLOCKFILE */
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379 #endif /* not MAILLOCK */
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380
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381 /* */
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382
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383 /* ARGSUSED */
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384
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385 int lkclose (fd, file)
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386 register int fd;
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387 register char *file;
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388 {
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389 char curlock[BUFSIZ];
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390 struct stat st;
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391 #ifdef FCNTL
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392 struct flock buf;
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393 #endif
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394
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395 if (fd == NOTOK)
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396 return OK;
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397 switch (lockstyle) {
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398 case LOK_UNIX:
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399 #ifndef MAILLOCK
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400 #ifndef LIBLOCKFILE
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401 #ifndef LOCKF
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402 #ifndef FLOCK
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403 #ifndef FCNTL
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404 /* should be an error? */
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405 #else /* FCNTL */
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406 buf.l_type = F_UNLCK;
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407 buf.l_whence = 0;
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408 buf.l_start = 0;
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409 buf.l_len = 0;
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410 fcntl(fd, F_SETLK, &buf);
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411 break;
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412 #endif
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413 #else /* FLOCK */
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414 flock (fd, LOCK_UN);
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415 break;
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416 #endif
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417 #else /* LOCKF */
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418 lseek (fd, (off_t)0, L_SET); /* make sure we unlock the whole thing */
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419 lockf (fd, F_ULOCK, 0L);
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420 break;
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421 #endif
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422 #else /* LIBLOCKFILE */
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423 {
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424 char *n = lockname_from_fd(fd);
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425 if (!n) /* shouldn't happen: would be program bug */
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426 return NOTOK;
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427 lockfile_remove(n);
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428 timerOFF(fd);
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429 break;
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430 }
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431 #endif
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432 #else /* MAILLOCK */
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433 if (is_default_spool (file)) {
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434 mailunlock ();
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435 break;
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436 }
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437 /* else fall */
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438 #endif
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439
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440 default:
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441 if (fstat (fd, &st) != NOTOK) {
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442 lockname (curlock, NULLCP, file, (int) st.st_dev, (int) st.st_ino);
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443 (void) unlink (curlock);
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444 timerOFF (fd);
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445 }
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446 }
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447
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448 return (close (fd));
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449 }
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|
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450
|
|
|
451
|
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|
452 /* */
|
|
|
453
|
|
|
454 FILE *lkfopen (file, mode)
|
|
|
455 register char *file,
|
|
|
456 *mode;
|
|
|
457 {
|
|
|
458 register int fd;
|
|
|
459 register FILE *fp;
|
|
|
460
|
|
|
461 if ((fd = lkopen (file, strcmp (mode, "r") ? 2 : 0)) == NOTOK)
|
|
|
462 return NULL;
|
|
|
463
|
|
|
464 if ((fp = fdopen (fd, mode)) == NULL) {
|
|
|
465 (void) close (fd);
|
|
|
466 return NULL;
|
|
|
467 }
|
|
|
468
|
|
|
469 return fp;
|
|
|
470 }
|
|
|
471
|
|
|
472
|
|
|
473 /* ARGSUSED */
|
|
|
474
|
|
|
475 int lkfclose (fp, file)
|
|
|
476 register FILE *fp;
|
|
|
477 register char *file;
|
|
|
478 {
|
|
|
479 char curlock[BUFSIZ];
|
|
|
480 struct stat st;
|
|
|
481 #ifdef FCNTL
|
|
|
482 struct flock buf;
|
|
|
483 #endif
|
|
|
484
|
|
|
485 if (fp == NULL)
|
|
|
486 return OK;
|
|
|
487
|
|
|
488 switch (lockstyle) {
|
|
|
489 case LOK_UNIX:
|
|
|
490 #ifndef MAILLOCK
|
|
|
491 #ifndef LIBLOCKFILE
|
|
|
492 #ifndef LOCKF
|
|
|
493 #ifndef FLOCK
|
|
|
494 #ifndef FCNTL
|
|
|
495 /* should be an error? */
|
|
|
496 #else /* FCNTL */
|
|
|
497 buf.l_type = F_UNLCK;
|
|
|
498 buf.l_whence = 0;
|
|
|
499 buf.l_start = 0;
|
|
|
500 buf.l_len = 0;
|
|
|
501 fcntl(fileno(fp), F_SETLK, &buf);
|
|
|
502 break;
|
|
|
503 #endif
|
|
|
504 #else /* FLOCK */
|
|
|
505 flock (fileno(fp), LOCK_UN);
|
|
|
506 break;
|
|
|
507 #endif
|
|
|
508 #else /* LOCKF */
|
|
|
509 fseek (fp, 0L, 0); /* make sure we unlock the whole thing */
|
|
|
510 lockf (fileno(fp), F_ULOCK, 0L);
|
|
|
511 break;
|
|
|
512 #endif
|
|
|
513 #else /* LIBLOCKFILE */
|
|
|
514 {
|
|
|
515 char *n = lockname_from_fd(fileno(fp));
|
|
|
516 if (!n) /* shouldn't happen */
|
|
|
517 return NOTOK;
|
|
|
518 lockfile_remove(n);
|
|
|
519 timerOFF(fileno(fp));
|
|
|
520 break;
|
|
|
521 }
|
|
|
522 #endif
|
|
|
523 #else /* MAILLOCK */
|
|
|
524 if (is_default_spool (file)) {
|
|
|
525 mailunlock ();
|
|
|
526 break;
|
|
|
527 }
|
|
|
528 /* else fall */
|
|
|
529 #endif
|
|
|
530
|
|
|
531 default:
|
|
|
532 if (fstat (fileno (fp), &st) != NOTOK) {
|
|
|
533 lockname (curlock, NULLCP, file, (int) st.st_dev, (int) st.st_ino);
|
|
|
534 (void) unlink (curlock);
|
|
|
535 #ifdef LIBLOCKFILE
|
|
|
536 /* shouldn't we timerOFF(fileno(fp))? We do in lkclose() -- PMM */
|
|
|
537 #else
|
|
|
538 timerOFF (fileno (fp));
|
|
|
539 #endif
|
|
|
540 }
|
|
|
541 }
|
|
|
542
|
|
|
543 return (fclose (fp));
|
|
|
544 }
|
|
|
545
|
|
|
546 /* */
|
|
|
547
|
|
|
548 #include <signal.h>
|
|
|
549
|
|
|
550 #define NSECS ((unsigned) 20)
|
|
|
551
|
|
|
552
|
|
|
553 struct lock {
|
|
|
554 #ifdef LIBLOCKFILE
|
|
|
555 int l_locktype;
|
|
|
556 #endif
|
|
|
557 int l_fd;
|
|
|
558 char *l_lock;
|
|
|
559 struct lock *l_next;
|
|
|
560 };
|
|
|
561 #define NULLP ((struct lock *) 0)
|
|
|
562
|
|
|
563 static struct lock *l_top = NULLP;
|
|
|
564
|
|
|
565 #ifdef MAILLOCK
|
|
|
566 static int is_default_spool (file)
|
|
|
567 register char *file;
|
|
|
568 {
|
|
|
569 static char *default_spool = NULLCP;
|
|
|
570
|
|
|
571 if (! default_spool)
|
|
|
572 default_spool = concat (MAILDIR, getusr (), NULLCP);
|
|
|
573 return strcmp(file, default_spool) == 0;
|
|
|
574 }
|
|
|
575
|
|
|
576 #else /* MAILLOCK */
|
|
|
577 #ifdef LIBLOCKFILE
|
|
|
578 /* simple routine to allow us to get the filename given an fd.
|
|
|
579 * Returns NULL if the fd isn't valid.
|
|
|
580 */
|
|
|
581 char *lockname_from_fd(fd)
|
|
|
582 int fd;
|
|
|
583 {
|
|
|
584 struct lock *pp;
|
|
|
585
|
|
|
586 for (pp = l_top; pp; pp = pp -> l_next)
|
|
|
587 if (pp->l_fd == fd)
|
|
|
588 return pp->l_lock;
|
|
|
589
|
|
|
590 return NULL;
|
|
|
591 }
|
|
|
592 #endif /* LIBLOCKFILE */
|
|
|
593 #endif /* MAILLOCK */
|
|
|
594
|
|
|
595 /* ARGSUSED */
|
|
|
596
|
|
|
597 static TYPESIG alrmser (sig)
|
|
|
598 int sig;
|
|
|
599 {
|
|
|
600 register int j;
|
|
|
601 register char *cp;
|
|
|
602 register struct lock *lp;
|
|
|
603
|
|
|
604 #ifndef BSD42
|
|
|
605 (void) signal (SIGALRM, alrmser);
|
|
|
606 #endif /* BSD42 */
|
|
|
607
|
|
|
608 for (lp = l_top; lp; lp = lp -> l_next)
|
|
|
609 #ifdef LIBLOCKFILE
|
|
|
610 if (lp->l_locktype == LOCK_LIBLOCKFILE)
|
|
|
611 lockfile_touch(lp->l_lock);
|
|
|
612 else
|
|
|
613 #endif
|
|
|
614 if (*(cp = lp -> l_lock) && (j = creat (cp, 0400)) != NOTOK)
|
|
|
615 (void) close (j);
|
|
|
616
|
|
|
617 (void) alarm (NSECS);
|
|
|
618 }
|
|
|
619
|
|
|
620 /* */
|
|
|
621
|
|
|
622 #ifdef LIBLOCKFILE
|
|
|
623 static timerON (lock, fd, ltype)
|
|
|
624 int ltype;
|
|
|
625 #else
|
|
|
626 static timerON (lock, fd)
|
|
|
627 #endif
|
|
|
628 char *lock;
|
|
|
629 int fd;
|
|
|
630 {
|
|
|
631 register struct lock *lp;
|
|
|
632
|
|
|
633 if ((lp = (struct lock *) malloc ((unsigned) (sizeof *lp))) == NULLP)
|
|
|
634 return; /* XXX */
|
|
|
635
|
|
|
636 lp -> l_fd = fd;
|
|
|
637 #ifdef LIBLOCKFILE
|
|
|
638 lp -> l_locktype = ltype;
|
|
|
639 #endif
|
|
|
640 if ((lp -> l_lock = malloc ((unsigned) (strlen (lock) + 1))) == NULLCP) {
|
|
|
641 free ((char *) lp);
|
|
|
642 return; /* XXX */
|
|
|
643 }
|
|
|
644 (void) strcpy (lp -> l_lock, lock);
|
|
|
645 lp -> l_next = NULLP;
|
|
|
646
|
|
|
647 if (l_top)
|
|
|
648 lp -> l_next = l_top;
|
|
|
649 else {
|
|
|
650 (void) signal (SIGALRM, alrmser);/* perhaps SIGT{STP,TIN,TOU} */
|
|
|
651 (void) alarm (NSECS);
|
|
|
652 }
|
|
|
653 l_top = lp;
|
|
|
654 }
|
|
|
655
|
|
|
656
|
|
|
657 static timerOFF (fd)
|
|
|
658 int fd;
|
|
|
659 {
|
|
|
660 register struct lock *pp,
|
|
|
661 *lp;
|
|
|
662
|
|
|
663 (void) alarm (0);
|
|
|
664
|
|
|
665 if (l_top) {
|
|
|
666 for (pp = lp = l_top; lp; pp = lp, lp = lp -> l_next)
|
|
|
667 if (lp -> l_fd == fd)
|
|
|
668 break;
|
|
|
669 if (lp) {
|
|
|
670 if (lp == l_top)
|
|
|
671 l_top = lp -> l_next;
|
|
|
672 else
|
|
|
673 pp -> l_next = lp -> l_next;
|
|
|
674
|
|
|
675 free (lp -> l_lock);
|
|
|
676 free ((char *) lp);
|
|
|
677 }
|
|
|
678 }
|
|
|
679
|
|
|
680 if (l_top)
|
|
|
681 (void) alarm (NSECS);
|
|
|
682 }
|
