root/ext/opcache/shared_alloc_posix.c

DEFINITIONS

1. create_segments
2. detach_segment
3. segment_type_size

   1 /*
   2    +----------------------------------------------------------------------+
   3    | Zend OPcache                                                         |
   4    +----------------------------------------------------------------------+
   5    | Copyright (c) 1998-2016 The PHP Group                                |
   6    +----------------------------------------------------------------------+
   7    | This source file is subject to version 3.01 of the PHP license,      |
   8    | that is bundled with this package in the file LICENSE, and is        |
   9    | available through the world-wide-web at the following url:           |
  10    | http://www.php.net/license/3_01.txt                                  |
  11    | If you did not receive a copy of the PHP license and are unable to   |
  12    | obtain it through the world-wide-web, please send a note to          |
  13    | license@php.net so we can mail you a copy immediately.               |
  14    +----------------------------------------------------------------------+
  15    | Authors: Andi Gutmans <andi@zend.com>                                |
  16    |          Zeev Suraski <zeev@zend.com>                                |
  17    |          Stanislav Malyshev <stas@zend.com>                          |
  18    |          Dmitry Stogov <dmitry@zend.com>                             |
  19    +----------------------------------------------------------------------+
  20 */
  21 
  22 #include "zend_shared_alloc.h"
  23 
  24 #ifdef USE_SHM_OPEN
  25 
  26 #include <sys/types.h>
  27 #include <sys/stat.h>
  28 #include <stdio.h>
  29 #include <fcntl.h>
  30 #include <sys/mman.h>
  31 #include <unistd.h>
  32 #include <stdlib.h>
  33 
  34 typedef struct  {
  35     zend_shared_segment common;
  36     int shm_fd;
  37 } zend_shared_segment_posix;
  38 
  39 static int create_segments(size_t requested_size, zend_shared_segment_posix ***shared_segments_p, int *shared_segments_count, char **error_in)
  40 {
  41         zend_shared_segment_posix *shared_segment;
  42         char shared_segment_name[sizeof("/ZendAccelerator.") + 20];
  43 
  44         *shared_segments_count = 1;
  45         *shared_segments_p = (zend_shared_segment_posix **) calloc(1, sizeof(zend_shared_segment_posix) + sizeof(void *));
  46         if (!*shared_segments_p) {
  47                 *error_in = "calloc";
  48                 return ALLOC_FAILURE;
  49         }
  50         shared_segment = (zend_shared_segment_posix *)((char *)(*shared_segments_p) + sizeof(void *));
  51         (*shared_segments_p)[0] = shared_segment;
  52 
  53         sprintf(shared_segment_name, "/ZendAccelerator.%d", getpid());
  54         shared_segment->shm_fd = shm_open(shared_segment_name, O_RDWR|O_CREAT|O_TRUNC, 0600);
  55         if (shared_segment->shm_fd == -1) {
  56                 *error_in = "shm_open";
  57                 return ALLOC_FAILURE;
  58         }
  59 
  60         if (ftruncate(shared_segment->shm_fd, requested_size) != 0) {
  61                 *error_in = "ftruncate";
  62                 shm_unlink(shared_segment_name);
  63                 return ALLOC_FAILURE;
  64         }
  65 
  66         shared_segment->common.p = mmap(0, requested_size, PROT_READ | PROT_WRITE, MAP_SHARED, shared_segment->shm_fd, 0);
  67         if (shared_segment->common.p == MAP_FAILED) {
  68                 *error_in = "mmap";
  69                 shm_unlink(shared_segment_name);
  70                 return ALLOC_FAILURE;
  71         }
  72         shm_unlink(shared_segment_name);
  73 
  74         shared_segment->common.pos = 0;
  75         shared_segment->common.size = requested_size;
  76 
  77         return ALLOC_SUCCESS;
  78 }
  79 
  80 static int detach_segment(zend_shared_segment_posix *shared_segment)
  81 {
  82         munmap(shared_segment->common.p, shared_segment->common.size);
  83         close(shared_segment->shm_fd);
  84         return 0;
  85 }
  86 
  87 static size_t segment_type_size(void)
  88 {
  89         return sizeof(zend_shared_segment_posix);
  90 }
  91 
  92 zend_shared_memory_handlers zend_alloc_posix_handlers = {
  93         (create_segments_t)create_segments,
  94         (detach_segment_t)detach_segment,
  95         segment_type_size
  96 };
  97 
  98 #endif /* USE_SHM_OPEN */