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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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12
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3 static char ident[] = "@(#)$Id: lock.c,v 1.2 2006/12/05 18:18:14 kono Exp $";
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0
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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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16
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81 #include <unistd.h>
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82
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0
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83
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84 #ifdef LOCKONLY
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85 #ifndef MMDFONLY
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86 char *lockldir = "/usr/spool/locks";
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87 #endif /* not MMDFONLY */
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88 #endif /* LOCKONLY */
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89
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90 #ifdef MAILLOCK
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91 /* Both "mts.h" and <maillock.h> defines MAILDIR */
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92 #undef MAILDIR
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93 #include <maillock.h>
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94 static int is_default_spool();
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95 #undef LIBLOCKFILE
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96 #else /* MAILLOCK */
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97 #ifdef LIBLOCKFILE
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98 #define LOCK_LIBLOCKFILE 1
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99 #define LOCK_B_LKOPEN 2
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100 char *lockname_from_fd();
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101 #endif
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102 #endif /* MAILLOCK */
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103
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104 static int b_lkopen(), lockit(), f_lkopen();
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16
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105 static void lockname(), timerON(), timerOFF();
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0
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106
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107 time_t time ();
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108 char *mktemp ();
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109
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110 /* */
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111
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16
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112 extern void mts_init (const char *);
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113
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0
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114 int lkopen (file, access)
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115 register char *file;
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116 register int access;
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117 {
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118 mts_init ("mts");
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119 switch (lockstyle) {
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120 case LOK_UNIX:
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121 #ifdef MAILLOCK
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122 if (is_default_spool (file))
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123 return f_lkopen (file, access);
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124 /* else fall */
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125 #else /* MAILLOCK */
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126 #if defined(FLOCK) || defined(LOCKF) || defined(FCNTL) || defined(LIBLOCKFILE)
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127 return f_lkopen (file, access);
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128 #endif
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129 #endif /* MAILLOCK */
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130
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131 default:
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132 return b_lkopen (file, access);
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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
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138 static int b_lkopen (file, access)
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139 register char *file;
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140 register int access;
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141 {
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142 register int i,
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143 j;
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144 time_t curtime;
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145 char curlock[BUFSIZ],
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146 tmplock[BUFSIZ];
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147 struct stat st;
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148
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149 if (stat (file, &st) == NOTOK)
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150 return NOTOK;
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151 lockname (curlock, tmplock, file, (int) st.st_dev, (int) st.st_ino);
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152
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153 for (i = 0;;)
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154 switch (lockit (tmplock, curlock)) {
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155 case OK:
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156 if ((i = open (file, access)) == NOTOK) {
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157 j = errno;
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158 (void) unlink (curlock);
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159 errno = j;
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160 }
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161 #ifdef LIBLOCKFILE
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162 timerON (curlock, i, LOCK_B_LKOPEN);
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163 #else
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164 timerON (curlock, i);
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165 #endif
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166 return i;
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167
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168 case NOTOK:
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169 if (stat (curlock, &st) == NOTOK) {
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170 if (i++ > 5)
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171 return NOTOK;
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172 sleep (5);
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173 break;
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174 }
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175
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176 i = 0;
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177 (void) time (&curtime);
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178 if (curtime < st.st_ctime + 60L)
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179 sleep (5);
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180 else
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181 (void) unlink (curlock);
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182 break;
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183 }
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184 }
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185
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186
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187 static int lockit (tmp, file)
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188 register char *tmp,
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189 *file;
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190 {
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191 register int fd;
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192
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193 if ((fd = creat (tmp, 0400)) == NOTOK)
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194 return NOTOK;
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195 #if defined(hpux) || defined(ncr)
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196 write(fd, "MH lock\n",8);
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197 #endif /* hpux */
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198 (void) close (fd);
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199
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200 fd = link (tmp, file);
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201 (void) unlink (tmp);
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202
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203 return (fd != NOTOK ? OK : NOTOK);
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204 }
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205
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206 /* */
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207
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16
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208 static void lockname (curlock, tmplock, file, dev, ino)
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0
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209 register char *curlock,
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210 *tmplock,
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211 *file;
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212 register int dev,
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213 ino;
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214 {
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215 register char *bp,
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216 *cp;
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217
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218 bp = curlock;
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219 if ((cp = rindex (file, '/')) == NULL || *++cp == 0)
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220 cp = file;
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221 if (lockldir == NULL || *lockldir == 0) {
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222 if (cp != file) {
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12
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223 (void) sprintf (bp, "%.*s", (int)(cp - file), file);
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0
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224 bp += strlen (bp);
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225 }
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226 }
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227 else {
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228 (void) sprintf (bp, "%s/", lockldir);
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229 bp += strlen (bp);
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230 }
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231
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232 switch (lockstyle) {
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233 case LOK_BELL:
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234 default:
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235 (void) sprintf (bp, "%s.lock", cp);
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236 break;
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237
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238 case LOK_MMDF:
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239 (void) sprintf (bp, "LCK%05d.%05d", dev, ino);
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240 break;
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241 }
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242
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243 if (tmplock) {
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244 if ((cp = rindex (curlock, '/')) == NULL || *++cp == 0)
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245 (void) strcpy (tmplock, ",LCK.XXXXXX");
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246 else
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247 (void) sprintf (tmplock, "%.*s,LCK.XXXXXX",
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248 (int)(cp - curlock), curlock);
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0
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249 (void) unlink (mktemp (tmplock));
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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
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255 #if defined(BSD42) || defined(SVR4)
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256 #include <sys/file.h>
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257 #if defined(SUN40) || defined(SVR4)
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258 #include <sys/fcntl.h>
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259 #endif
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260 #else
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261 #ifdef FCNTL
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262 #include <fcntl.h>
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263 #endif
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264 #endif
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265
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266 #ifdef MAILLOCK
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267
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268 static int f_lkopen (file, access)
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269 register char *file;
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270 register int access;
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271 {
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272 register int fd;
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273
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274 if (maillock (getusr (), 5) == L_SUCCESS) {
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275 if ((fd = open (file, access | O_NDELAY)) == NOTOK)
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276 return NOTOK;
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277 return fd;
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278 }
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279
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280 return NOTOK;
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281 }
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282
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283 #else /* not MAILLOCK */
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284 #ifdef LIBLOCKFILE
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285 #include <lockfile.h>
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286 #include <limits.h>
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287
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288 static int f_lkopen (file, access)
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289 register char *file;
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290 register int access;
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291 {
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292 int r, fd;
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293 char mlockfile[PATH_MAX];
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294
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295 snprintf(mlockfile, PATH_MAX, "%s.lock", file);
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296 r = lockfile_create(mlockfile, 5, 0);
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297 if (r != 0)
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298 return NOTOK;
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299 fd = open(file, access | O_NDELAY);
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300 if (fd == -1)
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301 return NOTOK;
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302 /* we have to set up a timer so we can touch the lockfile occasionally */
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303 timerON(mlockfile, fd, LOCK_LIBLOCKFILE);
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304 /* NB: it's OK to pass mlockfile as timerON immediately copies it
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305 * and we then use the copy in all lockfile_foo() operations.
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306 */
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307 return fd;
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308 }
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309
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310 #else /* not LIBLOCKFILE */
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311 #if defined(FLOCK) || defined(LOCKF) || defined(FCNTL)
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312
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313 static int f_lkopen (file, access)
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314 register char *file;
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315 register int access;
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316 {
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317 register int fd,
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318 i,
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319 j;
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320 #ifdef FCNTL
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321 struct flock buf;
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322 #endif /* FCNTL */
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323
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324 for (i = 0; i < 5; i++) {
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325 #if defined(LOCKF) || defined(FCNTL)
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326 j = access;
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327 access &= ~O_APPEND; /* make sure we open at the beginning */
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328 if ((access & 03) == O_RDONLY) {
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329 /* We MUST have write permission or lockf/fcntl() won't work */
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330 /* (Stupid eh?) */
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331 access &= ~O_RDONLY;
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332 access |= O_RDWR;
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333 }
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334 #endif /* LOCKF || FCNTL */
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335 if ((fd = open (file, access | O_NDELAY)) == NOTOK)
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336 return NOTOK;
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337 #ifndef LOCKF
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338 #ifndef FLOCK
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339 #ifndef FCNTL
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340 /* should be an error? */
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341 #else /* FCNTL */
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342 buf.l_type = F_WRLCK;
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343 buf.l_whence = 0;
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344 buf.l_start = 0;
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345 buf.l_len = 0;
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346 if (fcntl (fd, F_SETLK, &buf) != NOTOK)
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347 return fd;
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348 #endif
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349 #else /* FLOCK */
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350 if (flock (fd, LOCK_EX | LOCK_NB) != NOTOK)
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351 return fd;
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352 #endif
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353 #else /* LOCKF */
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354 if (lockf (fd, F_TLOCK, 0L) != NOTOK) {
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355 /* see if we should be at the end */
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356 if (j & O_APPEND)
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357 #ifdef SVR4
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358 lseek (fd, (off_t)0, SEEK_END);
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359 #else
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360 lseek (fd, (off_t)0, L_XTND);
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361 #endif
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362 return fd;
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363 }
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364 /* Fix errno - lockf screws it */
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365 if (errno == EACCES)
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366 errno = EWOULDBLOCK;
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367 #endif
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368 j = errno;
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369 (void) close (fd);
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370
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371 sleep (5);
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372 }
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373
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374 (void) close (fd);
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375 errno = j;
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376 return NOTOK;
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377 }
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378 #endif /* FLOCK || LOCKF || FCNTL */
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379 #endif /* not LIBLOCKFILE */
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380 #endif /* not MAILLOCK */
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381
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382 /* */
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383
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384 /* ARGSUSED */
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385
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386 int lkclose (fd, file)
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387 register int fd;
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388 register char *file;
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389 {
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390 char curlock[BUFSIZ];
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391 struct stat st;
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392 #ifdef FCNTL
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393 struct flock buf;
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394 #endif
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395
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396 if (fd == NOTOK)
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397 return OK;
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398 switch (lockstyle) {
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399 case LOK_UNIX:
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400 #ifndef MAILLOCK
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401 #ifndef LIBLOCKFILE
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402 #ifndef LOCKF
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403 #ifndef FLOCK
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404 #ifndef FCNTL
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405 /* should be an error? */
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406 #else /* FCNTL */
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407 buf.l_type = F_UNLCK;
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408 buf.l_whence = 0;
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409 buf.l_start = 0;
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410 buf.l_len = 0;
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411 fcntl(fd, F_SETLK, &buf);
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412 break;
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413 #endif
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414 #else /* FLOCK */
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415 flock (fd, LOCK_UN);
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416 break;
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417 #endif
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418 #else /* LOCKF */
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419 lseek (fd, (off_t)0, L_SET); /* make sure we unlock the whole thing */
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420 lockf (fd, F_ULOCK, 0L);
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421 break;
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422 #endif
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423 #else /* LIBLOCKFILE */
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424 {
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425 char *n = lockname_from_fd(fd);
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426 if (!n) /* shouldn't happen: would be program bug */
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427 return NOTOK;
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428 lockfile_remove(n);
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429 timerOFF(fd);
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430 break;
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431 }
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432 #endif
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433 #else /* MAILLOCK */
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434 if (is_default_spool (file)) {
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435 mailunlock ();
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436 break;
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437 }
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438 /* else fall */
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439 #endif
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440
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441 default:
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442 if (fstat (fd, &st) != NOTOK) {
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443 lockname (curlock, NULLCP, file, (int) st.st_dev, (int) st.st_ino);
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444 (void) unlink (curlock);
|
|
|
445 timerOFF (fd);
|
|
|
446 }
|
|
|
447 }
|
|
|
448
|
|
|
449 return (close (fd));
|
|
|
450 }
|
|
|
451
|
|
|
452
|
|
|
453 /* */
|
|
|
454
|
|
|
455 FILE *lkfopen (file, mode)
|
|
|
456 register char *file,
|
|
|
457 *mode;
|
|
|
458 {
|
|
|
459 register int fd;
|
|
|
460 register FILE *fp;
|
|
|
461
|
|
|
462 if ((fd = lkopen (file, strcmp (mode, "r") ? 2 : 0)) == NOTOK)
|
|
|
463 return NULL;
|
|
|
464
|
|
|
465 if ((fp = fdopen (fd, mode)) == NULL) {
|
|
|
466 (void) close (fd);
|
|
|
467 return NULL;
|
|
|
468 }
|
|
|
469
|
|
|
470 return fp;
|
|
|
471 }
|
|
|
472
|
|
|
473
|
|
|
474 /* ARGSUSED */
|
|
|
475
|
|
|
476 int lkfclose (fp, file)
|
|
|
477 register FILE *fp;
|
|
|
478 register char *file;
|
|
|
479 {
|
|
|
480 char curlock[BUFSIZ];
|
|
|
481 struct stat st;
|
|
|
482 #ifdef FCNTL
|
|
|
483 struct flock buf;
|
|
|
484 #endif
|
|
|
485
|
|
|
486 if (fp == NULL)
|
|
|
487 return OK;
|
|
|
488
|
|
|
489 switch (lockstyle) {
|
|
|
490 case LOK_UNIX:
|
|
|
491 #ifndef MAILLOCK
|
|
|
492 #ifndef LIBLOCKFILE
|
|
|
493 #ifndef LOCKF
|
|
|
494 #ifndef FLOCK
|
|
|
495 #ifndef FCNTL
|
|
|
496 /* should be an error? */
|
|
|
497 #else /* FCNTL */
|
|
|
498 buf.l_type = F_UNLCK;
|
|
|
499 buf.l_whence = 0;
|
|
|
500 buf.l_start = 0;
|
|
|
501 buf.l_len = 0;
|
|
|
502 fcntl(fileno(fp), F_SETLK, &buf);
|
|
|
503 break;
|
|
|
504 #endif
|
|
|
505 #else /* FLOCK */
|
|
|
506 flock (fileno(fp), LOCK_UN);
|
|
|
507 break;
|
|
|
508 #endif
|
|
|
509 #else /* LOCKF */
|
|
|
510 fseek (fp, 0L, 0); /* make sure we unlock the whole thing */
|
|
|
511 lockf (fileno(fp), F_ULOCK, 0L);
|
|
|
512 break;
|
|
|
513 #endif
|
|
|
514 #else /* LIBLOCKFILE */
|
|
|
515 {
|
|
|
516 char *n = lockname_from_fd(fileno(fp));
|
|
|
517 if (!n) /* shouldn't happen */
|
|
|
518 return NOTOK;
|
|
|
519 lockfile_remove(n);
|
|
|
520 timerOFF(fileno(fp));
|
|
|
521 break;
|
|
|
522 }
|
|
|
523 #endif
|
|
|
524 #else /* MAILLOCK */
|
|
|
525 if (is_default_spool (file)) {
|
|
|
526 mailunlock ();
|
|
|
527 break;
|
|
|
528 }
|
|
|
529 /* else fall */
|
|
|
530 #endif
|
|
|
531
|
|
|
532 default:
|
|
|
533 if (fstat (fileno (fp), &st) != NOTOK) {
|
|
|
534 lockname (curlock, NULLCP, file, (int) st.st_dev, (int) st.st_ino);
|
|
|
535 (void) unlink (curlock);
|
|
|
536 #ifdef LIBLOCKFILE
|
|
|
537 /* shouldn't we timerOFF(fileno(fp))? We do in lkclose() -- PMM */
|
|
|
538 #else
|
|
|
539 timerOFF (fileno (fp));
|
|
|
540 #endif
|
|
|
541 }
|
|
|
542 }
|
|
|
543
|
|
|
544 return (fclose (fp));
|
|
|
545 }
|
|
|
546
|
|
|
547 /* */
|
|
|
548
|
|
|
549 #include <signal.h>
|
|
|
550
|
|
|
551 #define NSECS ((unsigned) 20)
|
|
|
552
|
|
|
553
|
|
|
554 struct lock {
|
|
|
555 #ifdef LIBLOCKFILE
|
|
|
556 int l_locktype;
|
|
|
557 #endif
|
|
|
558 int l_fd;
|
|
|
559 char *l_lock;
|
|
|
560 struct lock *l_next;
|
|
|
561 };
|
|
|
562 #define NULLP ((struct lock *) 0)
|
|
|
563
|
|
|
564 static struct lock *l_top = NULLP;
|
|
|
565
|
|
|
566 #ifdef MAILLOCK
|
|
|
567 static int is_default_spool (file)
|
|
|
568 register char *file;
|
|
|
569 {
|
|
|
570 static char *default_spool = NULLCP;
|
|
|
571
|
|
|
572 if (! default_spool)
|
|
|
573 default_spool = concat (MAILDIR, getusr (), NULLCP);
|
|
|
574 return strcmp(file, default_spool) == 0;
|
|
|
575 }
|
|
|
576
|
|
|
577 #else /* MAILLOCK */
|
|
|
578 #ifdef LIBLOCKFILE
|
|
|
579 /* simple routine to allow us to get the filename given an fd.
|
|
|
580 * Returns NULL if the fd isn't valid.
|
|
|
581 */
|
|
|
582 char *lockname_from_fd(fd)
|
|
|
583 int fd;
|
|
|
584 {
|
|
|
585 struct lock *pp;
|
|
|
586
|
|
|
587 for (pp = l_top; pp; pp = pp -> l_next)
|
|
|
588 if (pp->l_fd == fd)
|
|
|
589 return pp->l_lock;
|
|
|
590
|
|
|
591 return NULL;
|
|
|
592 }
|
|
|
593 #endif /* LIBLOCKFILE */
|
|
|
594 #endif /* MAILLOCK */
|
|
|
595
|
|
|
596 /* ARGSUSED */
|
|
|
597
|
|
|
598 static TYPESIG alrmser (sig)
|
|
|
599 int sig;
|
|
|
600 {
|
|
|
601 register int j;
|
|
|
602 register char *cp;
|
|
|
603 register struct lock *lp;
|
|
|
604
|
|
|
605 #ifndef BSD42
|
|
|
606 (void) signal (SIGALRM, alrmser);
|
|
|
607 #endif /* BSD42 */
|
|
|
608
|
|
|
609 for (lp = l_top; lp; lp = lp -> l_next)
|
|
|
610 #ifdef LIBLOCKFILE
|
|
|
611 if (lp->l_locktype == LOCK_LIBLOCKFILE)
|
|
|
612 lockfile_touch(lp->l_lock);
|
|
|
613 else
|
|
|
614 #endif
|
|
|
615 if (*(cp = lp -> l_lock) && (j = creat (cp, 0400)) != NOTOK)
|
|
|
616 (void) close (j);
|
|
|
617
|
|
|
618 (void) alarm (NSECS);
|
|
|
619 }
|
|
|
620
|
|
|
621 /* */
|
|
|
622
|
|
|
623 #ifdef LIBLOCKFILE
|
|
16
|
624 static void timerON (lock, fd, ltype)
|
|
0
|
625 int ltype;
|
|
|
626 #else
|
|
16
|
627 static void timerON (lock, fd)
|
|
0
|
628 #endif
|
|
|
629 char *lock;
|
|
|
630 int fd;
|
|
|
631 {
|
|
|
632 register struct lock *lp;
|
|
|
633
|
|
|
634 if ((lp = (struct lock *) malloc ((unsigned) (sizeof *lp))) == NULLP)
|
|
|
635 return; /* XXX */
|
|
|
636
|
|
|
637 lp -> l_fd = fd;
|
|
|
638 #ifdef LIBLOCKFILE
|
|
|
639 lp -> l_locktype = ltype;
|
|
|
640 #endif
|
|
|
641 if ((lp -> l_lock = malloc ((unsigned) (strlen (lock) + 1))) == NULLCP) {
|
|
|
642 free ((char *) lp);
|
|
|
643 return; /* XXX */
|
|
|
644 }
|
|
|
645 (void) strcpy (lp -> l_lock, lock);
|
|
|
646 lp -> l_next = NULLP;
|
|
|
647
|
|
|
648 if (l_top)
|
|
|
649 lp -> l_next = l_top;
|
|
|
650 else {
|
|
|
651 (void) signal (SIGALRM, alrmser);/* perhaps SIGT{STP,TIN,TOU} */
|
|
|
652 (void) alarm (NSECS);
|
|
|
653 }
|
|
|
654 l_top = lp;
|
|
|
655 }
|
|
|
656
|
|
|
657
|
|
16
|
658 static void timerOFF (fd)
|
|
0
|
659 int fd;
|
|
|
660 {
|
|
|
661 register struct lock *pp,
|
|
|
662 *lp;
|
|
|
663
|
|
|
664 (void) alarm (0);
|
|
|
665
|
|
|
666 if (l_top) {
|
|
|
667 for (pp = lp = l_top; lp; pp = lp, lp = lp -> l_next)
|
|
|
668 if (lp -> l_fd == fd)
|
|
|
669 break;
|
|
|
670 if (lp) {
|
|
|
671 if (lp == l_top)
|
|
|
672 l_top = lp -> l_next;
|
|
|
673 else
|
|
|
674 pp -> l_next = lp -> l_next;
|
|
|
675
|
|
|
676 free (lp -> l_lock);
|
|
|
677 free ((char *) lp);
|
|
|
678 }
|
|
|
679 }
|
|
|
680
|
|
|
681 if (l_top)
|
|
|
682 (void) alarm (NSECS);
|
|
|
683 }
|
