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