1 /* lock.c - routines to open and apply an advisory lock to a file */
10 #include <ac/unistd.h>
13 #include <sys/param.h>
17 lock_fopen( char *fname, char *type, FILE **lfp )
22 /* open the lock file */
24 strcat( buf, ".lock" );
25 if ( (*lfp = fopen( buf, "w" )) == NULL ) {
26 Debug( LDAP_DEBUG_ANY, "could not open \"%s\"\n", buf, 0, 0 );
30 /* acquire the lock */
32 while ( flock( fileno( *lfp ), LOCK_EX ) != 0 ) {
34 while ( lockf( fileno( *lfp ), F_LOCK, 0 ) != 0 ) {
39 /* open the log file */
40 if ( (fp = fopen( fname, type )) == NULL ) {
41 Debug( LDAP_DEBUG_ANY, "could not open \"%s\"\n", fname, 0, 0 );
43 flock( fileno( *lfp ), LOCK_UN );
45 lockf( fileno( *lfp ), F_ULOCK, 0 );
56 lock_fclose( FILE *fp, FILE *lfp )
60 flock( fileno( lfp ), LOCK_UN );
62 lockf( fileno( lfp ), F_ULOCK, 0 );
66 return( fclose( fp ) );