121 lines
3.5 KiB
C
121 lines
3.5 KiB
C
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/* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "apr_arch_file_io.h"
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#if APR_HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
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#ifdef HAVE_SYS_FILE_H
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#include <sys/file.h>
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#endif
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APR_DECLARE(apr_status_t) apr_file_lock(apr_file_t *thefile, int type)
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{
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int rc;
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#if defined(HAVE_FCNTL_H)
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{
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struct flock l = { 0 };
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int fc;
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l.l_whence = SEEK_SET; /* lock from current point */
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l.l_start = 0; /* begin lock at this offset */
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l.l_len = 0; /* lock to end of file */
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if ((type & APR_FLOCK_TYPEMASK) == APR_FLOCK_SHARED)
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l.l_type = F_RDLCK;
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else
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l.l_type = F_WRLCK;
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fc = (type & APR_FLOCK_NONBLOCK) ? F_SETLK : F_SETLKW;
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/* keep trying if fcntl() gets interrupted (by a signal) */
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while ((rc = fcntl(thefile->filedes, fc, &l)) < 0 && errno == EINTR)
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continue;
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if (rc == -1) {
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/* on some Unix boxes (e.g., Tru64), we get EACCES instead
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* of EAGAIN; we don't want APR_STATUS_IS_EAGAIN() matching EACCES
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* since that breaks other things, so fix up the retcode here
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*/
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if (errno == EACCES) {
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return EAGAIN;
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}
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return errno;
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}
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}
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#elif defined(HAVE_SYS_FILE_H)
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{
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int ltype;
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if ((type & APR_FLOCK_TYPEMASK) == APR_FLOCK_SHARED)
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ltype = LOCK_SH;
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else
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ltype = LOCK_EX;
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if ((type & APR_FLOCK_NONBLOCK) != 0)
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ltype |= LOCK_NB;
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/* keep trying if flock() gets interrupted (by a signal) */
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while ((rc = flock(thefile->filedes, ltype)) < 0 && errno == EINTR)
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continue;
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if (rc == -1)
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return errno;
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}
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#else
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#error No file locking mechanism is available.
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#endif
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return APR_SUCCESS;
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}
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APR_DECLARE(apr_status_t) apr_file_unlock(apr_file_t *thefile)
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{
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int rc;
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#if defined(HAVE_FCNTL_H)
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{
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struct flock l = { 0 };
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l.l_whence = SEEK_SET; /* lock from current point */
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l.l_start = 0; /* begin lock at this offset */
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l.l_len = 0; /* lock to end of file */
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l.l_type = F_UNLCK;
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/* keep trying if fcntl() gets interrupted (by a signal) */
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while ((rc = fcntl(thefile->filedes, F_SETLKW, &l)) < 0
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&& errno == EINTR)
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continue;
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if (rc == -1)
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return errno;
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}
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#elif defined(HAVE_SYS_FILE_H)
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{
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/* keep trying if flock() gets interrupted (by a signal) */
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while ((rc = flock(thefile->filedes, LOCK_UN)) < 0 && errno == EINTR)
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continue;
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if (rc == -1)
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return errno;
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}
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#else
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#error No file locking mechanism is available.
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#endif
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return APR_SUCCESS;
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}
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