view src/lock.c @ 43:2842f50feb55 noffle

[svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h, control.c, control.h, database.c, database.h, dynamicstring.c, dynamicstring.h, fetch.c, fetch.h, fetchlist.c, fetchlist.h, group.c, group.h, itemlist.c, itemlist.h, lock.c, lock.h, log.c, log.h, noffle.c, online.c, online.h, outgoing.c, outgoing.h, over.c, over.h, post.c, post.h, protocol.c, protocol.h, pseudo.c, pseudo.h, request.c, request.h, server.c, server.h, util.c, util.h, wildmat.c, wildmat.h: Moved files to the subdirectory src/ * Makefile.am, acconfig.h, configure.in, docs/Makefile.am, src/Makefile.am, Makefile.in, aclocal.m4, config.h.in, configure, install-sh, missing, mkinstalldirs, stamp-h.in, docs/Makefile.in, src/Makefile.in: Added files. They are used by aclocal, autoheader, autoconf and automake. * src/config.c, src/config.h: Renamed to configfile.c and configfile.h, because configure will generate a config.h file itself. * src/client.c, src/content.c, src/database.c, src/fetch.c, src/fetchlist.c, src/group.c, src/lock.c, src/noffle.c, src/online.c, src/outgoing.c, src/over.c, src/pseudo.c, src/request.c, src/server.c, src/util.c: Changed '#include "config.h"' to '#include "configfile.h"'. * src/client.c, src/content.c, src/database.c, src/fetch.c, src/fetchlist.c, src/group.c, src/lock.c, src/online.c, src/outgoing.c, src/post.c, src/protocol.c, src/request.c, src/server.c: Files now #include <config.h>. Added missing <stdio.h>. This removes the warnings about snprintf() not being declared. * Makefile: Removed. This is now generated by configure.
author uh1763
date Fri, 05 May 2000 22:45:56 +0100
parents
children 125d79c9e586
line wrap: on
line source

/*
  lock.c

  $Id: lock.c 49 2000-05-05 21:45:56Z uh1763 $
*/

#if HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdio.h>
#include "lock.h"
#include <errno.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <time.h>
#include <unistd.h>
#include "configfile.h"
#include "log.h"
#include "database.h"
#include "group.h"
#include "request.h"

struct Lock
{
    int lockFd;
    Str lockFile;
} lock = { -1, "" };


#ifdef DEBUG
static Bool
testLock( void )
{
    return ( lock.lockFd != -1 );    
}
#endif

static Bool
waitLock( void )
{
    int fd;
    struct flock l;

    ASSERT( ! testLock() );
    Log_dbg( "Waiting for lock ..." );
    snprintf( lock.lockFile, MAXCHAR, "%s/lock/global", Cfg_spoolDir() );
    if ( ( fd = open( lock.lockFile, O_WRONLY | O_CREAT, 0644 ) ) < 0 )
    {
        Log_err( "Cannot open %s (%s)", lock.lockFile, strerror( errno ) );
        return FALSE;
    }
    l.l_type = F_WRLCK;
    l.l_start = 0;
    l.l_whence = SEEK_SET;
    l.l_len = 0;
    if ( fcntl( fd, F_SETLKW, &l ) < 0 )
    {
        Log_err( "Cannot lock %s: %s", lock.lockFile, strerror( errno ) );
        return FALSE;
    }
    lock.lockFd = fd;
    Log_dbg( "Lock successful" );
    return TRUE;
}

static void
releaseLock( void )
{
    struct flock l;

    ASSERT( testLock() );    
    l.l_type = F_UNLCK;
    l.l_start = 0;
    l.l_whence = SEEK_SET;
    l.l_len = 0;
    if ( fcntl( lock.lockFd, F_SETLK, &l ) < 0 )
        Log_err( "Cannot release %s: %s", lock.lockFile,
                 strerror( errno ) );
    close( lock.lockFd );
    lock.lockFd = -1;
    Log_dbg( "Releasing lock" );
}


/* Open all databases and set global lock. */
Bool
Lock_openDatabases( void )
{
  if ( ! waitLock() )
    {
      Log_err( "Could not get write lock" );
      return FALSE;
    }
  if ( ! Db_open() )
    {
      Log_err( "Could not open database" );
      releaseLock();
      return FALSE;
    }
  if ( ! Grp_open() )
    {
      Log_err( "Could not open groupinfo" );
      Db_close();
      releaseLock();
      return FALSE;
    }
  if ( ! Req_open() )
    {
      Log_err( "Could not initialize request database" );
      Grp_close();
      Db_close();
      releaseLock();
      return FALSE;
    }

  return TRUE;
}


/* Close all databases and release global lock. */
void
Lock_closeDatabases( void )
{
  Grp_close();
  Db_close();
  Req_close();
  releaseLock();
}