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65 lines
1.2 KiB
C
65 lines
1.2 KiB
C
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/* lock.c - routines to open and apply an advisory lock to a file */
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#include <stdio.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include "portable.h"
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#ifdef USE_LOCKF
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#include <unistd.h>
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#endif
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#include <sys/file.h>
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#include <sys/param.h>
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#include <sys/socket.h>
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#include "slap.h"
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FILE *
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lock_fopen( char *fname, char *type, FILE **lfp )
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{
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FILE *fp;
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char buf[MAXPATHLEN];
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/* open the lock file */
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strcpy( buf, fname );
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strcat( buf, ".lock" );
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if ( (*lfp = fopen( buf, "w" )) == NULL ) {
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Debug( LDAP_DEBUG_ANY, "could not open \"%s\"\n", buf, 0, 0 );
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return( NULL );
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}
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/* acquire the lock */
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#ifdef USE_LOCKF
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while ( lockf( fileno( *lfp ), F_LOCK, 0 ) != 0 ) {
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#else
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while ( flock( fileno( *lfp ), LOCK_EX ) != 0 ) {
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#endif
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; /* NULL */
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}
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/* open the log file */
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if ( (fp = fopen( fname, type )) == NULL ) {
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Debug( LDAP_DEBUG_ANY, "could not open \"%s\"\n", fname, 0, 0 );
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#ifdef USE_LOCKF
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lockf( fileno( *lfp ), F_ULOCK, 0 );
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#else
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flock( fileno( *lfp ), LOCK_UN );
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#endif
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return( NULL );
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}
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return( fp );
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}
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int
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lock_fclose( FILE *fp, FILE *lfp )
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{
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/* unlock */
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#ifdef USE_LOCKF
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lockf( fileno( lfp ), F_ULOCK, 0 );
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#else
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flock( fileno( lfp ), LOCK_UN );
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#endif
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fclose( lfp );
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return( fclose( fp ) );
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}
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