1 /* lock.c - routines to open and apply an advisory lock to a file */
13 #include <sys/param.h>
14 #include <sys/socket.h>
18 lock_fopen( char *fname, char *type, FILE **lfp )
23 /* open the lock file */
25 strcat( buf, ".lock" );
26 if ( (*lfp = fopen( buf, "w" )) == NULL ) {
27 Debug( LDAP_DEBUG_ANY, "could not open \"%s\"\n", buf, 0, 0 );
31 /* acquire the lock */
33 while ( lockf( fileno( *lfp ), F_LOCK, 0 ) != 0 ) {
35 while ( flock( fileno( *lfp ), LOCK_EX ) != 0 ) {
40 /* open the log file */
41 if ( (fp = fopen( fname, type )) == NULL ) {
42 Debug( LDAP_DEBUG_ANY, "could not open \"%s\"\n", fname, 0, 0 );
44 lockf( fileno( *lfp ), F_ULOCK, 0 );
46 flock( fileno( *lfp ), LOCK_UN );
55 lock_fclose( FILE *fp, FILE *lfp )
59 lockf( fileno( lfp ), F_ULOCK, 0 );
61 flock( fileno( lfp ), LOCK_UN );
65 return( fclose( fp ) );