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shared_alloc_shm.c

/*
   +----------------------------------------------------------------------+
   | Zend OPcache                                                         |
   +----------------------------------------------------------------------+
   | Copyright (c) 1998-2018 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:           |
   | http://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@zend.com>                                |
   |          Zeev Suraski <zeev@zend.com>                                |
   |          Stanislav Malyshev <stas@zend.com>                          |
   |          Dmitry Stogov <dmitry@zend.com>                             |
   +----------------------------------------------------------------------+
*/

#include "zend_shared_alloc.h"

#ifdef USE_SHM

#if defined(__FreeBSD__)
# include <machine/param.h>
#endif
#include <sys/types.h>
#include <sys/shm.h>
#include <sys/ipc.h>
#include <dirent.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>

#include <sys/stat.h>
#include <fcntl.h>

#ifndef MIN
# define MIN(x, y) ((x) > (y)? (y) : (x))
#endif

#define SEG_ALLOC_SIZE_MAX 32*1024*1024
#define SEG_ALLOC_SIZE_MIN 2*1024*1024

typedef struct  {
    zend_shared_segment common;
    int shm_id;
} zend_shared_segment_shm;

static int create_segments(size_t requested_size, zend_shared_segment_shm ***shared_segments_p, int *shared_segments_count, char **error_in)
{
	int i;
	size_t allocate_size = 0, remaining_bytes = requested_size, seg_allocate_size;
	int first_segment_id = -1;
	key_t first_segment_key = -1;
	struct shmid_ds sds;
	int shmget_flags;
	zend_shared_segment_shm *shared_segments;

seg_allocate_size = SEG_ALLOC_SIZE_MAX;
    /* determine segment size we _really_ need:
     * no more than to include requested_size
     */
    while (requested_size * 2 <= seg_allocate_size && seg_allocate_size > SEG_ALLOC_SIZE_MIN) {
        seg_allocate_size >>= 1;
    }

shmget_flags = IPC_CREAT|SHM_R|SHM_W|IPC_EXCL;

/* try allocating this much, if not - try shrinking */
	while (seg_allocate_size >= SEG_ALLOC_SIZE_MIN) {
		allocate_size = MIN(requested_size, seg_allocate_size);
		first_segment_id = shmget(first_segment_key, allocate_size, shmget_flags);
		if (first_segment_id != -1) {
			break;
		}
		seg_allocate_size >>= 1; /* shrink the allocated block */
	}

if (first_segment_id == -1) {
		*error_in = "shmget";
		return ALLOC_FAILURE;
	}

*shared_segments_count = ((requested_size - 1) / seg_allocate_size) + 1;
	*shared_segments_p = (zend_shared_segment_shm **) calloc(1, (*shared_segments_count) * sizeof(zend_shared_segment_shm) + sizeof(void *) * (*shared_segments_count));
	if (!*shared_segments_p) {
		*error_in = "calloc";
		return ALLOC_FAILURE;
	}
	shared_segments = (zend_shared_segment_shm *)((char *)(*shared_segments_p) + sizeof(void *) * (*shared_segments_count));
	for (i = 0; i < *shared_segments_count; i++) {
		(*shared_segments_p)[i] = shared_segments + i;
	}

remaining_bytes = requested_size;
	for (i = 0; i < *shared_segments_count; i++) {
		allocate_size = MIN(remaining_bytes, seg_allocate_size);
		if (i != 0) {
			shared_segments[i].shm_id = shmget(IPC_PRIVATE, allocate_size, shmget_flags);
		} else {
			shared_segments[i].shm_id = first_segment_id;
		}

if (shared_segments[i].shm_id == -1) {
			return ALLOC_FAILURE;
		}

shared_segments[i].common.p = shmat(shared_segments[i].shm_id, NULL, 0);
		if (shared_segments[i].common.p == (void *)-1) {
			*error_in = "shmat";
			shmctl(shared_segments[i].shm_id, IPC_RMID, &sds);
			return ALLOC_FAILURE;
		}
		shmctl(shared_segments[i].shm_id, IPC_RMID, &sds);

shared_segments[i].common.pos = 0;
		shared_segments[i].common.size = allocate_size;
		remaining_bytes -= allocate_size;
	}
	return ALLOC_SUCCESS;
}

static int detach_segment(zend_shared_segment_shm *shared_segment)
{
	shmdt(shared_segment->common.p);
	return 0;
}

static size_t segment_type_size(void)
{
	return sizeof(zend_shared_segment_shm);
}

zend_shared_memory_handlers zend_alloc_shm_handlers = {
	(create_segments_t)create_segments,
	(detach_segment_t)detach_segment,
	segment_type_size
};

#endif /* USE_SHM */

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0775	2019-01-11 06:33:06
..	dir	-	root/root	0775	2018-04-24 03:09:52
.libs	dir	-	root/root	0755	2019-01-11 06:33:06
Optimizer	dir	-	root/root	0775	2019-01-11 06:33:05
tests	dir	-	root/root	0775	2018-04-24 03:09:56
CREDITS	text/plain	83 B	root/root	0664	2018-04-24 03:09:56
README	text/plain	9.22 KB	root/root	0664	2018-04-24 03:09:56
ZendAccelerator.c	text/x-c	86.87 KB	root/root	0664	2018-04-24 03:09:56
ZendAccelerator.h	text/x-c	11.73 KB	root/root	0664	2018-04-24 03:09:56
ZendAccelerator.lo	text/plain	348 B	root/root	0644	2019-01-11 06:32:24
ZendAccelerator.o	application/x-object	316.77 KB	root/root	0644	2019-01-11 06:32:24
config.m4	text/x-c	8.8 KB	root/root	0664	2018-04-24 03:09:56
config.w32	text/plain	1.12 KB	root/root	0664	2018-04-24 03:09:56
opcache.la	text/plain	797 B	root/root	0644	2019-01-11 06:33:06
shared_alloc_mmap.c	text/x-c	3.24 KB	root/root	0664	2018-04-24 03:09:56
shared_alloc_mmap.lo	text/plain	354 B	root/root	0644	2019-01-11 06:32:34
shared_alloc_mmap.o	application/x-object	10.19 KB	root/root	0644	2019-01-11 06:32:34
shared_alloc_posix.c	text/x-c	3.43 KB	root/root	0664	2018-04-24 03:09:56
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shared_alloc_posix.o	application/x-object	5.75 KB	root/root	0644	2019-01-11 06:32:34
shared_alloc_shm.c	text/x-c	4.7 KB	root/root	0664	2018-04-24 03:09:56
shared_alloc_shm.lo	text/plain	351 B	root/root	0644	2019-01-11 06:32:33
shared_alloc_shm.o	application/x-object	13.55 KB	root/root	0644	2019-01-11 06:32:33
shared_alloc_win32.c	text/x-c	12.22 KB	root/root	0664	2018-04-24 03:09:56
zend_accelerator_blacklist.c	text/x-c	9.11 KB	root/root	0664	2018-04-24 03:09:57
zend_accelerator_blacklist.h	text/x-c	2.3 KB	root/root	0664	2018-04-24 03:09:57
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zend_accelerator_blacklist.o	application/x-object	49.72 KB	root/root	0644	2019-01-11 06:32:25
zend_accelerator_debug.c	text/x-c	2.88 KB	root/root	0664	2018-04-24 03:09:57
zend_accelerator_debug.h	text/plain	1.69 KB	root/root	0664	2018-04-24 03:09:57
zend_accelerator_debug.lo	text/plain	369 B	root/root	0644	2019-01-11 06:32:25
zend_accelerator_debug.o	application/x-object	37.39 KB	root/root	0644	2019-01-11 06:32:25
zend_accelerator_hash.c	text/x-c	7.58 KB	root/root	0664	2018-04-24 03:09:57
zend_accelerator_hash.h	text/x-c	4.12 KB	root/root	0664	2018-04-24 03:09:57
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zend_accelerator_hash.o	application/x-object	54.98 KB	root/root	0644	2019-01-11 06:32:26
zend_accelerator_module.c	text/x-c	34.11 KB	root/root	0664	2018-04-24 03:09:57
zend_accelerator_module.h	text/plain	1.53 KB	root/root	0664	2018-04-24 03:09:57
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zend_accelerator_module.o	application/x-object	145.19 KB	root/root	0644	2019-01-11 06:32:27
zend_accelerator_util_funcs.c	text/x-c	26.02 KB	root/root	0664	2018-04-24 03:09:57
zend_accelerator_util_funcs.h	text/x-c	2.22 KB	root/root	0664	2018-04-24 03:09:57
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zend_accelerator_util_funcs.o	application/x-object	98.66 KB	root/root	0644	2019-01-11 06:32:33
zend_file_cache.c	text/x-c	42.7 KB	root/root	0664	2018-04-24 03:09:57
zend_file_cache.h	text/plain	1.42 KB	root/root	0664	2018-04-24 03:09:57
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zend_file_cache.o	application/x-object	144.16 KB	root/root	0644	2019-01-11 06:32:31
zend_persist.c	text/x-c	27.52 KB	root/root	0664	2018-04-24 03:09:57
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zend_persist.o	application/x-object	122.94 KB	root/root	0644	2019-01-11 06:32:28
zend_persist_calc.c	text/x-c	13.02 KB	root/root	0664	2018-04-24 03:09:57
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zend_persist_calc.o	application/x-object	68.8 KB	root/root	0644	2019-01-11 06:32:29
zend_shared_alloc.c	text/x-c	14.29 KB	root/root	0664	2018-04-24 03:09:57
zend_shared_alloc.h	text/x-c	6.03 KB	root/root	0664	2018-04-24 03:09:57
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zend_shared_alloc.o	application/x-object	64.58 KB	root/root	0644	2019-01-11 06:32:31

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