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b5494457d8
This could cause problems on odd systems. The generic headers should be extended as needed to include necessary system headers or, if necessary, make explicit declarations. Extended ac/string.h header to look for string.h/strings.h if STDC_HEADERS is not defined. Also provide basic declarations for str*() functions. This could cause problems on odd systems. Extended ac/unistd.h header to define basic declaration for misc functions that might be missing from headers. This includes externs for getenv(), getopt(), mktemp(), tempname(). Protect fax500.h from multiple inclusion. Moved includes of system/generic headers back to source files. Made mail500 helper functions static. Fixed includes of ctype.h, signal.h, etc. to use generics. lutil/tempname.c: was including stdlib.h twice, one should stdio.h. Wrapped <sys/resource.h> with HAVE_SYS_RESOURCE_H. lber/io.c/ber_get_next(): Changed noctets back to signed. Used with BerRead which expects signed int as second arg and returns signed int.
139 lines
2.5 KiB
C
139 lines
2.5 KiB
C
/*
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* Copyright (c) 1996 Regents of the University of Michigan.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that this notice is preserved and that due credit is given
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* to the University of Michigan at Ann Arbor. The name of the University
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* may not be used to endorse or promote products derived from this
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* software without specific prior written permission. This software
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* is provided ``as is'' without express or implied warranty.
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*/
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/*
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* lock.c - routines to open and apply an advisory lock to a file
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*/
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#include "portable.h"
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#include <stdio.h>
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#include <ac/string.h>
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#include <ac/socket.h>
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#include <ac/time.h>
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#include <ac/unistd.h>
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#include <sys/file.h>
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#include <sys/param.h>
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#include "slurp.h"
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FILE *
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lock_fopen(
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char *fname,
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char *type,
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FILE **lfp
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)
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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,
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"Error: 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 HAVE_FLOCK
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while ( flock( fileno( *lfp ), LOCK_EX ) != 0 )
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#else
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while ( lockf( fileno( *lfp ), F_LOCK, 0 ) != 0 )
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#endif
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{
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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,
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"Error: could not open \"%s\"\n", fname, 0, 0 );
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#ifdef HAVE_FLOCK
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flock( fileno( *lfp ), LOCK_UN );
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#else
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lockf( fileno( *lfp ), F_ULOCK, 0 );
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#endif
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fclose( *lfp );
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*lfp = NULL;
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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(
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FILE *fp,
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FILE *lfp
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)
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{
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/* unlock */
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#ifdef HAVE_FLOCK
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flock( fileno( lfp ), LOCK_UN );
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#else
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lockf( fileno( lfp ), F_ULOCK, 0 );
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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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/*
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* Apply an advisory lock on a file. Just calls lock_fopen()
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*/
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int
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acquire_lock(
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char *file,
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FILE **rfp,
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FILE **lfp
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)
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{
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if (( *rfp = lock_fopen( file, "r+", lfp )) == NULL ) {
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Debug( LDAP_DEBUG_ANY,
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"Error: acquire_lock(%ld): Could not acquire lock on \"%s\"\n",
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(long) getpid(), file, 0);
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return( -1 );
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}
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return( 0 );
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}
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/*
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* Relinquish a lock on a file. Calls lock_fclose() and also removes the
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* lock file.
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*/
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int
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relinquish_lock(
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char *file,
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FILE *rfp,
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FILE *lfp
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)
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{
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if ( lock_fclose( rfp, lfp ) == EOF ) {
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Debug( LDAP_DEBUG_ANY,
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"Error: relinquish_lock (%ld): Error closing \"%s\"\n",
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(long) getpid(), file, 0 );
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return( -1 );
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}
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return( 0 );
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}
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