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annotate src/lock.c @ 53:9f3a4eccce32 noffle

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[svn] Use numbers for sections. Added using Noffle as a maillist newsgroup gateway.
author enz
date Mon, 08 May 2000 17:52:14 +0100
parents 2842f50feb55
children 125d79c9e586
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 49 2000-05-05 21:45:56Z 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 #include <time.h>
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19 #include <unistd.h>
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20 #include "configfile.h"
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21 #include "log.h"
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22 #include "database.h"
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23 #include "group.h"
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24 #include "request.h"
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25
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26 struct Lock
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27 {
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28 int lockFd;
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29 Str lockFile;
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30 } lock = { -1, "" };
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31
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32
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33 #ifdef DEBUG
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34 static Bool
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35 testLock( void )
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36 {
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37 return ( lock.lockFd != -1 );
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38 }
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39 #endif
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40
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41 static Bool
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42 waitLock( void )
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43 {
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44 int fd;
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45 struct flock l;
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46
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47 ASSERT( ! testLock() );
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48 Log_dbg( "Waiting for lock ..." );
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49 snprintf( lock.lockFile, MAXCHAR, "%s/lock/global", Cfg_spoolDir() );
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50 if ( ( fd = open( lock.lockFile, O_WRONLY | O_CREAT, 0644 ) ) < 0 )
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51 {
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52 Log_err( "Cannot open %s (%s)", lock.lockFile, strerror( errno ) );
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53 return FALSE;
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54 }
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55 l.l_type = F_WRLCK;
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56 l.l_start = 0;
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57 l.l_whence = SEEK_SET;
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58 l.l_len = 0;
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59 if ( fcntl( fd, F_SETLKW, &l ) < 0 )
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60 {
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61 Log_err( "Cannot lock %s: %s", lock.lockFile, strerror( errno ) );
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62 return FALSE;
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63 }
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64 lock.lockFd = fd;
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65 Log_dbg( "Lock successful" );
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66 return TRUE;
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67 }
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68
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69 static void
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70 releaseLock( void )
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71 {
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72 struct flock l;
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73
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74 ASSERT( testLock() );
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75 l.l_type = F_UNLCK;
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76 l.l_start = 0;
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77 l.l_whence = SEEK_SET;
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78 l.l_len = 0;
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79 if ( fcntl( lock.lockFd, F_SETLK, &l ) < 0 )
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80 Log_err( "Cannot release %s: %s", lock.lockFile,
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81 strerror( errno ) );
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82 close( lock.lockFd );
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83 lock.lockFd = -1;
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84 Log_dbg( "Releasing lock" );
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85 }
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86
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87
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88 /* Open all databases and set global lock. */
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89 Bool
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90 Lock_openDatabases( void )
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91 {
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92 if ( ! waitLock() )
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93 {
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94 Log_err( "Could not get write lock" );
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95 return FALSE;
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96 }
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97 if ( ! Db_open() )
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98 {
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99 Log_err( "Could not open database" );
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100 releaseLock();
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101 return FALSE;
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102 }
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103 if ( ! Grp_open() )
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104 {
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105 Log_err( "Could not open groupinfo" );
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106 Db_close();
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107 releaseLock();
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108 return FALSE;
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109 }
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110 if ( ! Req_open() )
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111 {
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112 Log_err( "Could not initialize request database" );
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113 Grp_close();
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114 Db_close();
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115 releaseLock();
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116 return FALSE;
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117 }
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118
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119 return TRUE;
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120 }
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121
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122
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123 /* Close all databases and release global lock. */
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124 void
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125 Lock_closeDatabases( void )
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126 {
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127 Grp_close();
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128 Db_close();
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129 Req_close();
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130 releaseLock();
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131 }