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|
/*
+----------------------------------------------------------------------+
| Zend OPcache |
+----------------------------------------------------------------------+
| Copyright (c) The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| https://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Andi Gutmans <andi@php.net> |
| Zeev Suraski <zeev@php.net> |
| Stanislav Malyshev <stas@zend.com> |
| Dmitry Stogov <dmitry@php.net> |
+----------------------------------------------------------------------+
*/
#include "zend_shared_alloc.h"
#ifdef USE_SHM_OPEN
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <unistd.h>
#include <stdlib.h>
typedef struct {
zend_shared_segment common;
int shm_fd;
} zend_shared_segment_posix;
static int create_segments(size_t requested_size, zend_shared_segment_posix ***shared_segments_p, int *shared_segments_count, const char **error_in)
{
zend_shared_segment_posix *shared_segment;
char shared_segment_name[sizeof("/ZendAccelerator.") + 20];
int shared_segment_flags = O_RDWR|O_CREAT|O_TRUNC;
mode_t shared_segment_mode = 0600;
#if defined(HAVE_SHM_CREATE_LARGEPAGE)
/**
* architectures have 3 entries max and we are interested
* from the second offset minimum to be worthy creating
* a special shared segment tagged as 'large'.
* only then amd64/i386/arm64 and perharps risc64*
* archs are on interest here.
*/
size_t i, shared_segment_sizes = 0, shared_segment_lg_index = 0;
size_t shared_segment_sindexes[3] = {0};
const size_t entries = sizeof(shared_segment_sindexes) / sizeof(shared_segment_sindexes[0]);
shared_segment_sizes = getpagesizes(shared_segment_sindexes, entries);
if (shared_segment_sizes > 0) {
for (i = shared_segment_sizes - 1; i >= 0; i --) {
if (shared_segment_sindexes[i] != 0 &&
!(requested_size % shared_segment_sindexes[i])) {
shared_segment_lg_index = i;
break;
}
}
}
#endif
*shared_segments_count = 1;
*shared_segments_p = (zend_shared_segment_posix **) calloc(1, sizeof(zend_shared_segment_posix) + sizeof(void *));
if (!*shared_segments_p) {
*error_in = "calloc";
return ALLOC_FAILURE;
}
shared_segment = (zend_shared_segment_posix *)((char *)(*shared_segments_p) + sizeof(void *));
(*shared_segments_p)[0] = shared_segment;
snprintf(shared_segment_name, sizeof(shared_segment_name), "/ZendAccelerator.%d", getpid());
#if defined(HAVE_SHM_CREATE_LARGEPAGE)
if (shared_segment_lg_index > 0) {
shared_segment->shm_fd = shm_create_largepage(shared_segment_name, shared_segment_flags, shared_segment_lg_index, SHM_LARGEPAGE_ALLOC_DEFAULT, shared_segment_mode);
if (shared_segment->shm_fd != -1) {
goto truncate_segment;
}
}
#endif
shared_segment->shm_fd = shm_open(shared_segment_name, shared_segment_flags, shared_segment_mode);
if (shared_segment->shm_fd == -1) {
*error_in = "shm_open";
return ALLOC_FAILURE;
}
#if defined(HAVE_SHM_CREATE_LARGEPAGE)
truncate_segment:
#endif
if (ftruncate(shared_segment->shm_fd, requested_size) != 0) {
*error_in = "ftruncate";
shm_unlink(shared_segment_name);
return ALLOC_FAILURE;
}
shared_segment->common.p = mmap(0, requested_size, PROT_READ | PROT_WRITE, MAP_SHARED, shared_segment->shm_fd, 0);
if (shared_segment->common.p == MAP_FAILED) {
*error_in = "mmap";
shm_unlink(shared_segment_name);
return ALLOC_FAILURE;
}
shm_unlink(shared_segment_name);
shared_segment->common.pos = 0;
shared_segment->common.size = requested_size;
return ALLOC_SUCCESS;
}
static int detach_segment(zend_shared_segment_posix *shared_segment)
{
munmap(shared_segment->common.p, shared_segment->common.size);
close(shared_segment->shm_fd);
return 0;
}
static size_t segment_type_size(void)
{
return sizeof(zend_shared_segment_posix);
}
const zend_shared_memory_handlers zend_alloc_posix_handlers = {
(create_segments_t)create_segments,
(detach_segment_t)detach_segment,
segment_type_size
};
#endif /* USE_SHM_OPEN */
|
