1 /* Licensed to the Apache Software Foundation (ASF) under one or more
2 * contributor license agreements. See the NOTICE file distributed with
3 * this work for additional information regarding copyright ownership.
4 * The ASF licenses this file to You under the Apache License, Version 2.0
5 * (the "License"); you may not use this file except in compliance with
6 * the License. You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #include "apr_arch_file_io.h"
22 #ifdef HAVE_SYS_FILE_H
26 APR_DECLARE(apr_status_t) apr_file_lock(apr_file_t *thefile, int type)
30 #if defined(HAVE_FCNTL_H)
32 struct flock l = { 0 };
35 l.l_whence = SEEK_SET; /* lock from current point */
36 l.l_start = 0; /* begin lock at this offset */
37 l.l_len = 0; /* lock to end of file */
38 if ((type & APR_FLOCK_TYPEMASK) == APR_FLOCK_SHARED)
43 fc = (type & APR_FLOCK_NONBLOCK) ? F_SETLK : F_SETLKW;
45 /* keep trying if fcntl() gets interrupted (by a signal) */
46 while ((rc = fcntl(thefile->filedes, fc, &l)) < 0 && errno == EINTR)
50 /* on some Unix boxes (e.g., Tru64), we get EACCES instead
51 * of EAGAIN; we don't want APR_STATUS_IS_EAGAIN() matching EACCES
52 * since that breaks other things, so fix up the retcode here
54 if (errno == EACCES) {
60 #elif defined(HAVE_SYS_FILE_H)
64 if ((type & APR_FLOCK_TYPEMASK) == APR_FLOCK_SHARED)
68 if ((type & APR_FLOCK_NONBLOCK) != 0)
71 /* keep trying if flock() gets interrupted (by a signal) */
72 while ((rc = flock(thefile->filedes, ltype)) < 0 && errno == EINTR)
79 #error No file locking mechanism is available.
85 APR_DECLARE(apr_status_t) apr_file_unlock(apr_file_t *thefile)
89 #if defined(HAVE_FCNTL_H)
91 struct flock l = { 0 };
93 l.l_whence = SEEK_SET; /* lock from current point */
94 l.l_start = 0; /* begin lock at this offset */
95 l.l_len = 0; /* lock to end of file */
98 /* keep trying if fcntl() gets interrupted (by a signal) */
99 while ((rc = fcntl(thefile->filedes, F_SETLKW, &l)) < 0
106 #elif defined(HAVE_SYS_FILE_H)
108 /* keep trying if flock() gets interrupted (by a signal) */
109 while ((rc = flock(thefile->filedes, LOCK_UN)) < 0 && errno == EINTR)
116 #error No file locking mechanism is available.