701 lines
21 KiB
C
701 lines
21 KiB
C
/* 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_shm.h"
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#include "apr_general.h"
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#include "apr_errno.h"
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#include "apr_user.h"
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#include "apr_strings.h"
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#include "apr_hash.h"
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#if APR_USE_SHMEM_MMAP_SHM
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/*
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* For portable use, a shared memory object should be identified by a name of
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* the form /somename; that is, a null-terminated string of up to NAME_MAX
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* (i.e., 255) characters consisting of an initial slash, followed by one or
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* more characters, none of which are slashes.
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*/
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#ifndef NAME_MAX
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#define NAME_MAX 255
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#endif
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/* See proc_mutex.c and sem_open for the reason for all this! */
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static unsigned int rshash (const char *p) {
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/* hash function from Robert Sedgwicks 'Algorithms in C' book */
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unsigned int b = 378551;
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unsigned int a = 63689;
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unsigned int retval = 0;
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for( ; *p; p++) {
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retval = retval * a + (*p);
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a *= b;
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}
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return retval;
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}
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static const char *make_shm_open_safe_name(const char *filename,
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apr_pool_t *pool)
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{
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apr_ssize_t flen;
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unsigned int h1, h2;
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if (filename == NULL) {
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return NULL;
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}
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flen = strlen(filename);
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h1 = (apr_hashfunc_default(filename, &flen) & 0xffffffff);
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h2 = (rshash(filename) & 0xffffffff);
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return apr_psprintf(pool, "/ShM.%xH%x", h1, h2);
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}
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#endif
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#if APR_USE_SHMEM_SHMGET
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static key_t our_ftok(const char *filename)
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{
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/* to help avoid collisions while still using
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* an easily recreated proj_id */
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apr_ssize_t slen = strlen(filename);
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return ftok(filename,
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(int)apr_hashfunc_default(filename, &slen));
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}
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#endif
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static apr_status_t shm_cleanup_owner(void *m_)
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{
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apr_shm_t *m = (apr_shm_t *)m_;
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/* anonymous shared memory */
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if (m->filename == NULL) {
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#if APR_USE_SHMEM_MMAP_ZERO || APR_USE_SHMEM_MMAP_ANON
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if (munmap(m->base, m->realsize) == -1) {
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return errno;
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}
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return APR_SUCCESS;
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#elif APR_USE_SHMEM_SHMGET_ANON
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if (shmdt(m->base) == -1) {
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return errno;
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}
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/* This segment will automatically remove itself after all
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* references have detached. */
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return APR_SUCCESS;
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#endif
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}
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/* name-based shared memory */
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else {
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#if APR_USE_SHMEM_MMAP_TMP
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if (munmap(m->base, m->realsize) == -1) {
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return errno;
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}
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if (access(m->filename, F_OK)) {
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return APR_SUCCESS;
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}
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else {
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return apr_file_remove(m->filename, m->pool);
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}
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#elif APR_USE_SHMEM_MMAP_SHM
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if (munmap(m->base, m->realsize) == -1) {
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return errno;
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}
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if (shm_unlink(make_shm_open_safe_name(m->filename, m->pool)) == -1 && errno != ENOENT) {
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return errno;
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}
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return APR_SUCCESS;
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#elif APR_USE_SHMEM_SHMGET
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/* Indicate that the segment is to be destroyed as soon
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* as all processes have detached. This also disallows any
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* new attachments to the segment. */
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if (shmctl(m->shmid, IPC_RMID, NULL) == -1 && errno != EINVAL) {
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return errno;
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}
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if (shmdt(m->base) == -1) {
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return errno;
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}
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if (access(m->filename, F_OK)) {
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return APR_SUCCESS;
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}
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else {
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return apr_file_remove(m->filename, m->pool);
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}
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#else
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return APR_ENOTIMPL;
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#endif
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}
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}
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APR_DECLARE(apr_status_t) apr_shm_create(apr_shm_t **m,
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apr_size_t reqsize,
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const char *filename,
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apr_pool_t *pool)
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{
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apr_shm_t *new_m;
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apr_status_t status;
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#if APR_USE_SHMEM_SHMGET || APR_USE_SHMEM_SHMGET_ANON
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struct shmid_ds shmbuf;
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apr_uid_t uid;
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apr_gid_t gid;
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#endif
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#if APR_USE_SHMEM_MMAP_TMP || APR_USE_SHMEM_MMAP_SHM || \
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APR_USE_SHMEM_MMAP_ZERO
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int tmpfd;
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#endif
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#if APR_USE_SHMEM_SHMGET
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apr_size_t nbytes;
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key_t shmkey;
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#endif
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#if APR_USE_SHMEM_MMAP_ZERO || APR_USE_SHMEM_SHMGET || \
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APR_USE_SHMEM_MMAP_TMP || APR_USE_SHMEM_MMAP_SHM
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apr_file_t *file; /* file where metadata is stored */
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#endif
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/* Check if they want anonymous or name-based shared memory */
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if (filename == NULL) {
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#if APR_USE_SHMEM_MMAP_ZERO || APR_USE_SHMEM_MMAP_ANON
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new_m = apr_palloc(pool, sizeof(apr_shm_t));
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new_m->pool = pool;
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new_m->reqsize = reqsize;
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new_m->realsize = reqsize +
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APR_ALIGN_DEFAULT(sizeof(apr_size_t)); /* room for metadata */
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new_m->filename = NULL;
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#if APR_USE_SHMEM_MMAP_ZERO
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status = apr_file_open(&file, "/dev/zero", APR_READ | APR_WRITE,
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APR_OS_DEFAULT, pool);
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if (status != APR_SUCCESS) {
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return status;
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}
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status = apr_os_file_get(&tmpfd, file);
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if (status != APR_SUCCESS) {
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return status;
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}
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new_m->base = mmap(NULL, new_m->realsize, PROT_READ|PROT_WRITE,
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MAP_SHARED, tmpfd, 0);
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if (new_m->base == (void *)MAP_FAILED) {
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return errno;
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}
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status = apr_file_close(file);
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if (status != APR_SUCCESS) {
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return status;
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}
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/* store the real size in the metadata */
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*(apr_size_t*)(new_m->base) = new_m->realsize;
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/* metadata isn't usable */
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new_m->usable = (char *)new_m->base + APR_ALIGN_DEFAULT(sizeof(apr_size_t));
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apr_pool_cleanup_register(new_m->pool, new_m, shm_cleanup_owner,
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apr_pool_cleanup_null);
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*m = new_m;
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return APR_SUCCESS;
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#elif APR_USE_SHMEM_MMAP_ANON
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new_m->base = mmap(NULL, new_m->realsize, PROT_READ|PROT_WRITE,
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MAP_ANON|MAP_SHARED, -1, 0);
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if (new_m->base == (void *)MAP_FAILED) {
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return errno;
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}
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/* store the real size in the metadata */
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*(apr_size_t*)(new_m->base) = new_m->realsize;
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/* metadata isn't usable */
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new_m->usable = (char *)new_m->base + APR_ALIGN_DEFAULT(sizeof(apr_size_t));
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apr_pool_cleanup_register(new_m->pool, new_m, shm_cleanup_owner,
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apr_pool_cleanup_null);
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*m = new_m;
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return APR_SUCCESS;
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#endif /* APR_USE_SHMEM_MMAP_ZERO */
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#elif APR_USE_SHMEM_SHMGET_ANON
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new_m = apr_palloc(pool, sizeof(apr_shm_t));
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new_m->pool = pool;
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new_m->reqsize = reqsize;
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new_m->realsize = reqsize;
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new_m->filename = NULL;
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if ((new_m->shmid = shmget(IPC_PRIVATE, new_m->realsize,
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SHM_R | SHM_W | IPC_CREAT)) < 0) {
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return errno;
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}
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if ((new_m->base = shmat(new_m->shmid, NULL, 0)) == (void *)-1) {
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return errno;
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}
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new_m->usable = new_m->base;
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if (shmctl(new_m->shmid, IPC_STAT, &shmbuf) == -1) {
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return errno;
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}
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apr_uid_current(&uid, &gid, pool);
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shmbuf.shm_perm.uid = uid;
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shmbuf.shm_perm.gid = gid;
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if (shmctl(new_m->shmid, IPC_SET, &shmbuf) == -1) {
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return errno;
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}
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/* Remove the segment once use count hits zero.
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* We will not attach to this segment again, since it is
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* anonymous memory, so it is ok to mark it for deletion.
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*/
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if (shmctl(new_m->shmid, IPC_RMID, NULL) == -1) {
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return errno;
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}
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apr_pool_cleanup_register(new_m->pool, new_m, shm_cleanup_owner,
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apr_pool_cleanup_null);
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*m = new_m;
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return APR_SUCCESS;
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#else
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/* It is an error if they want anonymous memory but we don't have it. */
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return APR_ENOTIMPL; /* requested anonymous but we don't have it */
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#endif
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}
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/* Name-based shared memory */
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else {
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new_m = apr_palloc(pool, sizeof(apr_shm_t));
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new_m->pool = pool;
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new_m->reqsize = reqsize;
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new_m->filename = apr_pstrdup(pool, filename);
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#if APR_USE_SHMEM_MMAP_SHM
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const char *shm_name = make_shm_open_safe_name(filename, pool);
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#endif
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#if APR_USE_SHMEM_MMAP_TMP || APR_USE_SHMEM_MMAP_SHM
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new_m->realsize = reqsize +
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APR_ALIGN_DEFAULT(sizeof(apr_size_t)); /* room for metadata */
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/* FIXME: Ignore error for now. *
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* status = apr_file_remove(file, pool);*/
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status = APR_SUCCESS;
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#if APR_USE_SHMEM_MMAP_TMP
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/* FIXME: Is APR_OS_DEFAULT sufficient? */
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status = apr_file_open(&file, filename,
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APR_READ | APR_WRITE | APR_CREATE | APR_EXCL,
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APR_OS_DEFAULT, pool);
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if (status != APR_SUCCESS) {
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return status;
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}
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status = apr_os_file_get(&tmpfd, file);
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if (status != APR_SUCCESS) {
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apr_file_close(file); /* ignore errors, we're failing */
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apr_file_remove(new_m->filename, new_m->pool);
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return status;
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}
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status = apr_file_trunc(file, new_m->realsize);
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if (status != APR_SUCCESS && status != APR_ESPIPE) {
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apr_file_close(file); /* ignore errors, we're failing */
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apr_file_remove(new_m->filename, new_m->pool);
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return status;
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}
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new_m->base = mmap(NULL, new_m->realsize, PROT_READ | PROT_WRITE,
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MAP_SHARED, tmpfd, 0);
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/* FIXME: check for errors */
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status = apr_file_close(file);
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if (status != APR_SUCCESS) {
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return status;
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}
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#endif /* APR_USE_SHMEM_MMAP_TMP */
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#if APR_USE_SHMEM_MMAP_SHM
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/* FIXME: SysV uses 0600... should we? */
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tmpfd = shm_open(shm_name, O_RDWR | O_CREAT | O_EXCL, 0644);
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if (tmpfd == -1) {
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return errno;
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}
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status = apr_os_file_put(&file, &tmpfd,
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APR_READ | APR_WRITE | APR_CREATE | APR_EXCL,
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pool);
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if (status != APR_SUCCESS) {
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return status;
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}
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status = apr_file_trunc(file, new_m->realsize);
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if (status != APR_SUCCESS && status != APR_ESPIPE) {
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shm_unlink(shm_name); /* we're failing, remove the object */
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return status;
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}
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new_m->base = mmap(NULL, new_m->realsize, PROT_READ | PROT_WRITE,
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MAP_SHARED, tmpfd, 0);
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/* FIXME: check for errors */
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status = apr_file_close(file);
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if (status != APR_SUCCESS) {
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return status;
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}
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#endif /* APR_USE_SHMEM_MMAP_SHM */
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/* store the real size in the metadata */
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*(apr_size_t*)(new_m->base) = new_m->realsize;
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/* metadata isn't usable */
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new_m->usable = (char *)new_m->base + APR_ALIGN_DEFAULT(sizeof(apr_size_t));
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apr_pool_cleanup_register(new_m->pool, new_m, shm_cleanup_owner,
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apr_pool_cleanup_null);
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*m = new_m;
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return APR_SUCCESS;
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#elif APR_USE_SHMEM_SHMGET
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new_m->realsize = reqsize;
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/* FIXME: APR_OS_DEFAULT is too permissive, switch to 600 I think. */
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status = apr_file_open(&file, filename,
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APR_FOPEN_WRITE | APR_FOPEN_CREATE | APR_FOPEN_EXCL,
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APR_OS_DEFAULT, pool);
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if (status != APR_SUCCESS) {
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return status;
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}
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/* ftok() (on solaris at least) requires that the file actually
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* exist before calling ftok(). */
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shmkey = our_ftok(filename);
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if (shmkey == (key_t)-1) {
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apr_file_close(file);
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return errno;
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}
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if ((new_m->shmid = shmget(shmkey, new_m->realsize,
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SHM_R | SHM_W | IPC_CREAT | IPC_EXCL)) < 0) {
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apr_file_close(file);
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return errno;
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}
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if ((new_m->base = shmat(new_m->shmid, NULL, 0)) == (void *)-1) {
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apr_file_close(file);
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return errno;
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}
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new_m->usable = new_m->base;
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if (shmctl(new_m->shmid, IPC_STAT, &shmbuf) == -1) {
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apr_file_close(file);
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return errno;
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}
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apr_uid_current(&uid, &gid, pool);
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shmbuf.shm_perm.uid = uid;
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shmbuf.shm_perm.gid = gid;
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if (shmctl(new_m->shmid, IPC_SET, &shmbuf) == -1) {
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apr_file_close(file);
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return errno;
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}
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nbytes = sizeof(reqsize);
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status = apr_file_write(file, (const void *)&reqsize,
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&nbytes);
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if (status != APR_SUCCESS) {
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apr_file_close(file);
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return status;
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}
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status = apr_file_close(file);
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if (status != APR_SUCCESS) {
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return status;
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}
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apr_pool_cleanup_register(new_m->pool, new_m, shm_cleanup_owner,
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apr_pool_cleanup_null);
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*m = new_m;
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return APR_SUCCESS;
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#else
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return APR_ENOTIMPL;
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#endif
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}
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}
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APR_DECLARE(apr_status_t) apr_shm_create_ex(apr_shm_t **m,
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apr_size_t reqsize,
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const char *filename,
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apr_pool_t *p,
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apr_int32_t flags)
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{
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return apr_shm_create(m, reqsize, filename, p);
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}
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APR_DECLARE(apr_status_t) apr_shm_remove(const char *filename,
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apr_pool_t *pool)
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{
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#if APR_USE_SHMEM_SHMGET
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apr_status_t status;
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apr_file_t *file;
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key_t shmkey;
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int shmid;
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#endif
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#if APR_USE_SHMEM_MMAP_TMP
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return apr_file_remove(filename, pool);
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#elif APR_USE_SHMEM_MMAP_SHM
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const char *shm_name = make_shm_open_safe_name(filename, pool);
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if (shm_unlink(shm_name) == -1) {
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return errno;
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}
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return APR_SUCCESS;
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#elif APR_USE_SHMEM_SHMGET
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/* Presume that the file already exists; just open for writing */
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status = apr_file_open(&file, filename, APR_FOPEN_WRITE,
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APR_OS_DEFAULT, pool);
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if (status) {
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return status;
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}
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/* ftok() (on solaris at least) requires that the file actually
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* exist before calling ftok(). */
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shmkey = our_ftok(filename);
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if (shmkey == (key_t)-1) {
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goto shm_remove_failed;
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}
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apr_file_close(file);
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if ((shmid = shmget(shmkey, 0, SHM_R | SHM_W)) < 0) {
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goto shm_remove_failed;
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}
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/* Indicate that the segment is to be destroyed as soon
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* as all processes have detached. This also disallows any
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* new attachments to the segment. */
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if (shmctl(shmid, IPC_RMID, NULL) == -1) {
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goto shm_remove_failed;
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}
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return apr_file_remove(filename, pool);
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shm_remove_failed:
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status = errno;
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/* ensure the file has been removed anyway. */
|
|
apr_file_remove(filename, pool);
|
|
return status;
|
|
#else
|
|
|
|
/* No support for anonymous shm */
|
|
return APR_ENOTIMPL;
|
|
#endif
|
|
}
|
|
|
|
APR_DECLARE(apr_status_t) apr_shm_destroy(apr_shm_t *m)
|
|
{
|
|
return apr_pool_cleanup_run(m->pool, m, shm_cleanup_owner);
|
|
}
|
|
|
|
static apr_status_t shm_cleanup_attach(void *m_)
|
|
{
|
|
apr_shm_t *m = (apr_shm_t *)m_;
|
|
|
|
if (m->filename == NULL) {
|
|
/* It doesn't make sense to detach from an anonymous memory segment. */
|
|
return APR_EINVAL;
|
|
}
|
|
else {
|
|
#if APR_USE_SHMEM_MMAP_TMP || APR_USE_SHMEM_MMAP_SHM
|
|
if (munmap(m->base, m->realsize) == -1) {
|
|
return errno;
|
|
}
|
|
return APR_SUCCESS;
|
|
#elif APR_USE_SHMEM_SHMGET
|
|
if (shmdt(m->base) == -1) {
|
|
return errno;
|
|
}
|
|
return APR_SUCCESS;
|
|
#else
|
|
return APR_ENOTIMPL;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
APR_DECLARE(apr_status_t) apr_shm_attach(apr_shm_t **m,
|
|
const char *filename,
|
|
apr_pool_t *pool)
|
|
{
|
|
if (filename == NULL) {
|
|
/* It doesn't make sense to attach to a segment if you don't know
|
|
* the filename. */
|
|
return APR_EINVAL;
|
|
}
|
|
else {
|
|
#if APR_USE_SHMEM_MMAP_TMP || APR_USE_SHMEM_MMAP_SHM
|
|
apr_shm_t *new_m;
|
|
apr_status_t status;
|
|
int tmpfd;
|
|
apr_file_t *file; /* file where metadata is stored */
|
|
apr_size_t nbytes;
|
|
|
|
new_m = apr_palloc(pool, sizeof(apr_shm_t));
|
|
new_m->pool = pool;
|
|
new_m->filename = apr_pstrdup(pool, filename);
|
|
#if APR_USE_SHMEM_MMAP_SHM
|
|
const char *shm_name = make_shm_open_safe_name(filename, pool);
|
|
|
|
/* FIXME: SysV uses 0600... should we? */
|
|
tmpfd = shm_open(shm_name, O_RDWR, 0644);
|
|
if (tmpfd == -1) {
|
|
return errno;
|
|
}
|
|
|
|
status = apr_os_file_put(&file, &tmpfd,
|
|
APR_READ | APR_WRITE,
|
|
pool);
|
|
if (status != APR_SUCCESS) {
|
|
return status;
|
|
}
|
|
|
|
#elif APR_USE_SHMEM_MMAP_TMP
|
|
status = apr_file_open(&file, filename,
|
|
APR_READ | APR_WRITE,
|
|
APR_OS_DEFAULT, pool);
|
|
if (status != APR_SUCCESS) {
|
|
return status;
|
|
}
|
|
status = apr_os_file_get(&tmpfd, file);
|
|
if (status != APR_SUCCESS) {
|
|
return status;
|
|
}
|
|
#else
|
|
return APR_ENOTIMPL;
|
|
#endif
|
|
|
|
nbytes = sizeof(new_m->realsize);
|
|
status = apr_file_read(file, (void *)&(new_m->realsize),
|
|
&nbytes);
|
|
if (status != APR_SUCCESS) {
|
|
return status;
|
|
}
|
|
|
|
status = apr_os_file_get(&tmpfd, file);
|
|
if (status != APR_SUCCESS) {
|
|
apr_file_close(file); /* ignore errors, we're failing */
|
|
apr_file_remove(new_m->filename, new_m->pool);
|
|
return status;
|
|
}
|
|
|
|
new_m->reqsize = new_m->realsize - sizeof(apr_size_t);
|
|
|
|
new_m->base = mmap(NULL, new_m->realsize, PROT_READ | PROT_WRITE,
|
|
MAP_SHARED, tmpfd, 0);
|
|
/* FIXME: check for errors */
|
|
|
|
status = apr_file_close(file);
|
|
if (status != APR_SUCCESS) {
|
|
return status;
|
|
}
|
|
|
|
/* metadata isn't part of the usable segment */
|
|
new_m->usable = (char *)new_m->base + APR_ALIGN_DEFAULT(sizeof(apr_size_t));
|
|
|
|
apr_pool_cleanup_register(new_m->pool, new_m, shm_cleanup_attach,
|
|
apr_pool_cleanup_null);
|
|
*m = new_m;
|
|
return APR_SUCCESS;
|
|
|
|
#elif APR_USE_SHMEM_SHMGET
|
|
apr_shm_t *new_m;
|
|
apr_status_t status;
|
|
apr_file_t *file; /* file where metadata is stored */
|
|
apr_size_t nbytes;
|
|
key_t shmkey;
|
|
|
|
new_m = apr_palloc(pool, sizeof(apr_shm_t));
|
|
|
|
status = apr_file_open(&file, filename,
|
|
APR_FOPEN_READ, APR_OS_DEFAULT, pool);
|
|
if (status != APR_SUCCESS) {
|
|
return status;
|
|
}
|
|
|
|
nbytes = sizeof(new_m->reqsize);
|
|
status = apr_file_read(file, (void *)&(new_m->reqsize),
|
|
&nbytes);
|
|
if (status != APR_SUCCESS) {
|
|
return status;
|
|
}
|
|
status = apr_file_close(file);
|
|
if (status != APR_SUCCESS) {
|
|
return status;
|
|
}
|
|
|
|
new_m->filename = apr_pstrdup(pool, filename);
|
|
new_m->pool = pool;
|
|
shmkey = our_ftok(filename);
|
|
if (shmkey == (key_t)-1) {
|
|
return errno;
|
|
}
|
|
if ((new_m->shmid = shmget(shmkey, 0, SHM_R | SHM_W)) == -1) {
|
|
return errno;
|
|
}
|
|
if ((new_m->base = shmat(new_m->shmid, NULL, 0)) == (void *)-1) {
|
|
return errno;
|
|
}
|
|
new_m->usable = new_m->base;
|
|
new_m->realsize = new_m->reqsize;
|
|
|
|
apr_pool_cleanup_register(new_m->pool, new_m, shm_cleanup_attach,
|
|
apr_pool_cleanup_null);
|
|
*m = new_m;
|
|
return APR_SUCCESS;
|
|
|
|
#else
|
|
return APR_ENOTIMPL;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
APR_DECLARE(apr_status_t) apr_shm_attach_ex(apr_shm_t **m,
|
|
const char *filename,
|
|
apr_pool_t *pool,
|
|
apr_int32_t flags)
|
|
{
|
|
return apr_shm_attach(m, filename, pool);
|
|
}
|
|
|
|
APR_DECLARE(apr_status_t) apr_shm_detach(apr_shm_t *m)
|
|
{
|
|
apr_status_t rv = shm_cleanup_attach(m);
|
|
apr_pool_cleanup_kill(m->pool, m, shm_cleanup_attach);
|
|
return rv;
|
|
}
|
|
|
|
APR_DECLARE(void *) apr_shm_baseaddr_get(const apr_shm_t *m)
|
|
{
|
|
return m->usable;
|
|
}
|
|
|
|
APR_DECLARE(apr_size_t) apr_shm_size_get(const apr_shm_t *m)
|
|
{
|
|
return m->reqsize;
|
|
}
|
|
|
|
APR_POOL_IMPLEMENT_ACCESSOR(shm)
|
|
|
|
APR_DECLARE(apr_status_t) apr_os_shm_get(apr_os_shm_t *osshm,
|
|
apr_shm_t *shm)
|
|
{
|
|
return APR_ENOTIMPL;
|
|
}
|
|
|
|
APR_DECLARE(apr_status_t) apr_os_shm_put(apr_shm_t **m,
|
|
apr_os_shm_t *osshm,
|
|
apr_pool_t *pool)
|
|
{
|
|
return APR_ENOTIMPL;
|
|
}
|
|
|