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annotate src/os/win32/ngx_shmem.c @ 2720:b3b8c66bd520

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support attaching to an existent Win32 shared memory
author Igor Sysoev <igor@sysoev.ru>
date Sat, 18 Apr 2009 19:27:28 +0000
parents d5896f6608e8
children d52cf82d0d77
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9
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10
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11 ngx_int_t
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12 ngx_shm_alloc(ngx_shm_t *shm)
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13 {
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14 u_char *name;
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16 name = ngx_alloc(shm->name.len + 2 + sizeof(NGX_INT32_LEN), shm->log);
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17 if (name == NULL) {
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18 return NGX_ERROR;
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19 }
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20
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21 ngx_sprintf(name, "%V_%s%Z", &shm->name, ngx_unique);
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22
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23 ngx_set_errno(0);
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24
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25 shm->handle = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE,
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26 0, shm->size, (char *) name);
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27
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28 if (shm->handle == NULL) {
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29 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno,
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30 "CreateFileMapping(%uz, %s) failed",
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31 shm->size, shm->name.data);
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32 goto failed;
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33 }
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34
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35 if (ngx_errno == ERROR_ALREADY_EXISTS) {
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36 shm->exists = 1;
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37 }
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38
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39 shm->addr = MapViewOfFile(shm->handle, FILE_MAP_WRITE, 0, 0, 0);
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40
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41 if (shm->addr != NULL) {
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42 return NGX_OK;
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43 }
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44
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45 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno,
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46 "MapViewOfFile(%uz) failed", shm->size);
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47
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48 if (CloseHandle(shm->handle) == 0) {
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49 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno,
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50 "CloseHandle() failed");
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51 }
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52
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53 failed:
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54
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55 ngx_free(name);
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56
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57 return NGX_ERROR;
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58 }
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60
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61 void
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62 ngx_shm_free(ngx_shm_t *shm)
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63 {
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64 if (UnmapViewOfFile(shm->addr) == 0) {
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65 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno,
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66 "UnmapViewOfFile(%p) failed", shm->addr);
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67 }
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68
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69 if (CloseHandle(shm->handle) == 0) {
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70 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno,
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71 "CloseHandle() failed");
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72 }
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73 }