diff options
Diffstat (limited to 'file_io/unix/filedup.c')
| -rw-r--r-- | file_io/unix/filedup.c | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/file_io/unix/filedup.c b/file_io/unix/filedup.c new file mode 100644 index 0000000..97d11b6 --- /dev/null +++ b/file_io/unix/filedup.c @@ -0,0 +1,181 @@ +/* Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include "apr_arch_file_io.h" +#include "apr_strings.h" +#include "apr_portable.h" +#include "apr_thread_mutex.h" +#include "apr_arch_inherit.h" + +static apr_status_t file_dup(apr_file_t **new_file, + apr_file_t *old_file, apr_pool_t *p, + int which_dup) +{ + int rv; +#ifdef HAVE_DUP3 + int flags = 0; +#endif + + if (which_dup == 2) { + if ((*new_file) == NULL) { + /* We can't dup2 unless we have a valid new_file */ + return APR_EINVAL; + } +#ifdef HAVE_DUP3 + if (!((*new_file)->flags & (APR_FOPEN_NOCLEANUP|APR_INHERIT))) + flags |= O_CLOEXEC; + rv = dup3(old_file->filedes, (*new_file)->filedes, flags); +#else + rv = dup2(old_file->filedes, (*new_file)->filedes); + if (!((*new_file)->flags & (APR_FOPEN_NOCLEANUP|APR_INHERIT))) { + int flags; + + if (rv == -1) + return errno; + + if ((flags = fcntl((*new_file)->filedes, F_GETFD)) == -1) + return errno; + + flags |= FD_CLOEXEC; + if (fcntl((*new_file)->filedes, F_SETFD, flags) == -1) + return errno; + + } +#endif + } else { + rv = dup(old_file->filedes); + } + + if (rv == -1) + return errno; + + if (which_dup == 1) { + (*new_file) = (apr_file_t *)apr_pcalloc(p, sizeof(apr_file_t)); + (*new_file)->pool = p; + (*new_file)->filedes = rv; + } + + (*new_file)->fname = apr_pstrdup(p, old_file->fname); + (*new_file)->buffered = old_file->buffered; + + /* If the existing socket in a dup2 is already buffered, we + * have an existing and valid (hopefully) mutex, so we don't + * want to create it again as we could leak! + */ +#if APR_HAS_THREADS + if ((*new_file)->buffered && !(*new_file)->thlock && old_file->thlock) { + apr_thread_mutex_create(&((*new_file)->thlock), + APR_THREAD_MUTEX_DEFAULT, p); + } +#endif + /* As above, only create the buffer if we haven't already + * got one. + */ + if ((*new_file)->buffered && !(*new_file)->buffer) { + (*new_file)->buffer = apr_palloc(p, old_file->bufsize); + (*new_file)->bufsize = old_file->bufsize; + } + + /* this is the way dup() works */ + (*new_file)->blocking = old_file->blocking; + + /* make sure unget behavior is consistent */ + (*new_file)->ungetchar = old_file->ungetchar; + + /* apr_file_dup2() retains the original cleanup, reflecting + * the existing inherit and nocleanup flags. This means, + * that apr_file_dup2() cannot be called against an apr_file_t + * already closed with apr_file_close, because the expected + * cleanup was already killed. + */ + if (which_dup == 2) { + return APR_SUCCESS; + } + + /* apr_file_dup() retains all old_file flags with the exceptions + * of APR_INHERIT and APR_FOPEN_NOCLEANUP. + * The user must call apr_file_inherit_set() on the dupped + * apr_file_t when desired. + */ + (*new_file)->flags = old_file->flags + & ~(APR_INHERIT | APR_FOPEN_NOCLEANUP); + + apr_pool_cleanup_register((*new_file)->pool, (void *)(*new_file), + apr_unix_file_cleanup, + apr_unix_child_file_cleanup); +#ifndef WAITIO_USES_POLL + /* Start out with no pollset. apr_wait_for_io_or_timeout() will + * initialize the pollset if needed. + */ + (*new_file)->pollset = NULL; +#endif + return APR_SUCCESS; +} + +APR_DECLARE(apr_status_t) apr_file_dup(apr_file_t **new_file, + apr_file_t *old_file, apr_pool_t *p) +{ + return file_dup(new_file, old_file, p, 1); +} + +APR_DECLARE(apr_status_t) apr_file_dup2(apr_file_t *new_file, + apr_file_t *old_file, apr_pool_t *p) +{ + return file_dup(&new_file, old_file, p, 2); +} + +APR_DECLARE(apr_status_t) apr_file_setaside(apr_file_t **new_file, + apr_file_t *old_file, + apr_pool_t *p) +{ + *new_file = (apr_file_t *)apr_pmemdup(p, old_file, sizeof(apr_file_t)); + (*new_file)->pool = p; + if (old_file->buffered) { + (*new_file)->buffer = apr_palloc(p, old_file->bufsize); + (*new_file)->bufsize = old_file->bufsize; + if (old_file->direction == 1) { + memcpy((*new_file)->buffer, old_file->buffer, old_file->bufpos); + } + else { + memcpy((*new_file)->buffer, old_file->buffer, old_file->dataRead); + } +#if APR_HAS_THREADS + if (old_file->thlock) { + apr_thread_mutex_create(&((*new_file)->thlock), + APR_THREAD_MUTEX_DEFAULT, p); + apr_thread_mutex_destroy(old_file->thlock); + } +#endif /* APR_HAS_THREADS */ + } + if (old_file->fname) { + (*new_file)->fname = apr_pstrdup(p, old_file->fname); + } + if (!(old_file->flags & APR_FOPEN_NOCLEANUP)) { + apr_pool_cleanup_kill(old_file->pool, (void *)old_file, + apr_unix_file_cleanup); + apr_pool_cleanup_register(p, (void *)(*new_file), + apr_unix_file_cleanup, + ((*new_file)->flags & APR_INHERIT) + ? apr_pool_cleanup_null + : apr_unix_child_file_cleanup); + } + + old_file->filedes = -1; +#ifndef WAITIO_USES_POLL + (*new_file)->pollset = NULL; +#endif + return APR_SUCCESS; +} |