Mercurial > noffle

annotate src/lock.c @ 126:7c7a7c96d35b noffle

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[svn] Release-1-0 merge
author bears
date Tue, 25 Jul 2000 13:12:50 +0100
parents 125d79c9e586
children 3c71e28c8eef
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
43
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1 /*
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2 lock.c
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3
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4 $Id: lock.c 60 2000-05-09 22:28:38Z uh1763 $
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5 */
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6
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7 #if HAVE_CONFIG_H
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8 #include <config.h>
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9 #endif
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10
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11 #include <stdio.h>
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12 #include "lock.h"
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13 #include <errno.h>
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14 #include <ctype.h>
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15 #include <sys/types.h>
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16 #include <sys/stat.h>
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17 #include <fcntl.h>
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18
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19 #if TIME_WITH_SYS_TIME
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20 #include <sys/time.h>
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21 #include <time.h>
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22 #else
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23 #if HAVE_SYS_TIME_H
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24 #include <sys/time.h>
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25 #else
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26 #include <time.h>
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27 #endif
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28 #endif
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29
43
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30 #include <unistd.h>
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31 #include "configfile.h"
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32 #include "log.h"
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33 #include "database.h"
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34 #include "group.h"
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35 #include "request.h"
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36 #include "portable.h"
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37
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38 struct Lock
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39 {
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40 int lockFd;
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41 Str lockFile;
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42 } lock = { -1, "" };
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43
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44
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45 #ifdef DEBUG
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46 static Bool
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47 testLock( void )
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48 {
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49 return ( lock.lockFd != -1 );
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50 }
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51 #endif
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52
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53 static Bool
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54 waitLock( void )
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55 {
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56 int fd;
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57 struct flock l;
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58
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59 ASSERT( ! testLock() );
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60 Log_dbg( "Waiting for lock ..." );
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61 snprintf( lock.lockFile, MAXCHAR, "%s/lock/global", Cfg_spoolDir() );
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62 if ( ( fd = open( lock.lockFile, O_WRONLY | O_CREAT, 0644 ) ) < 0 )
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63 {
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64 Log_err( "Cannot open %s (%s)", lock.lockFile, strerror( errno ) );
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65 return FALSE;
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66 }
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67 l.l_type = F_WRLCK;
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68 l.l_start = 0;
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69 l.l_whence = SEEK_SET;
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70 l.l_len = 0;
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71 if ( fcntl( fd, F_SETLKW, &l ) < 0 )
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72 {
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73 Log_err( "Cannot lock %s: %s", lock.lockFile, strerror( errno ) );
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74 return FALSE;
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75 }
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76 lock.lockFd = fd;
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77 Log_dbg( "Lock successful" );
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78 return TRUE;
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79 }
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80
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81 static void
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82 releaseLock( void )
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83 {
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84 struct flock l;
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85
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86 ASSERT( testLock() );
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87 l.l_type = F_UNLCK;
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88 l.l_start = 0;
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89 l.l_whence = SEEK_SET;
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90 l.l_len = 0;
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91 if ( fcntl( lock.lockFd, F_SETLK, &l ) < 0 )
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92 Log_err( "Cannot release %s: %s", lock.lockFile,
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93 strerror( errno ) );
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94 close( lock.lockFd );
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95 lock.lockFd = -1;
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96 Log_dbg( "Releasing lock" );
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97 }
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98
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99
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100 /* Open all databases and set global lock. */
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101 Bool
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102 Lock_openDatabases( void )
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103 {
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104 if ( ! waitLock() )
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105 {
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106 Log_err( "Could not get write lock" );
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107 return FALSE;
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108 }
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109 if ( ! Db_open() )
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110 {
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111 Log_err( "Could not open database" );
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112 releaseLock();
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113 return FALSE;
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114 }
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115 if ( ! Grp_open() )
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116 {
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117 Log_err( "Could not open groupinfo" );
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118 Db_close();
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119 releaseLock();
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120 return FALSE;
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121 }
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122 if ( ! Req_open() )
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123 {
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124 Log_err( "Could not initialize request database" );
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125 Grp_close();
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126 Db_close();
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127 releaseLock();
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128 return FALSE;
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129 }
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130
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131 return TRUE;
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132 }
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133
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134
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135 /* Close all databases and release global lock. */
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136 void
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137 Lock_closeDatabases( void )
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138 {
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139 Grp_close();
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140 Db_close();
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141 Req_close();
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142 releaseLock();
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143 }