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annotate src/os/win32/ngx_shmem.c @ 4570:b3d4e9c66e24

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Win32: fixed memory allocation for shmem name (ticket #134).
author Maxim Dounin <mdounin@mdounin.ru>
date Mon, 02 Apr 2012 21:30:58 +0000
parents d620f497c50f
children af7eba90645d
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 * Copyright (C) Nginx, Inc.
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5 */
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6
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7
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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12 ngx_int_t
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13 ngx_shm_alloc(ngx_shm_t *shm)
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14 {
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15 u_char *name;
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16 uint64_t size;
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17
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18 name = ngx_alloc(shm->name.len + 2 + NGX_INT32_LEN, shm->log);
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19 if (name == NULL) {
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20 return NGX_ERROR;
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21 }
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23 (void) ngx_sprintf(name, "%V_%s%Z", &shm->name, ngx_unique);
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24
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25 ngx_set_errno(0);
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26
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27 size = shm->size;
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28
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29 shm->handle = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE,
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30 (u_long) (size >> 32),
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31 (u_long) (size & 0xffffffff),
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32 (char *) name);
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33
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34 if (shm->handle == NULL) {
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35 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno,
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36 "CreateFileMapping(%uz, %s) failed",
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37 shm->size, name);
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38 ngx_free(name);
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39
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40 return NGX_ERROR;
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41 }
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42
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43 ngx_free(name);
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44
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45 if (ngx_errno == ERROR_ALREADY_EXISTS) {
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46 shm->exists = 1;
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47 }
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49 shm->addr = MapViewOfFile(shm->handle, FILE_MAP_WRITE, 0, 0, 0);
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50
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51 if (shm->addr != NULL) {
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52 return NGX_OK;
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53 }
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54
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55 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno,
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56 "MapViewOfFile(%uz) of file mapping \"%V\" failed",
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57 shm->size, &shm->name);
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58
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59 if (CloseHandle(shm->handle) == 0) {
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60 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno,
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61 "CloseHandle() of file mapping \"%V\" failed",
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62 &shm->name);
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63 }
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64
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65 return NGX_ERROR;
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66 }
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69 void
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70 ngx_shm_free(ngx_shm_t *shm)
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71 {
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72 if (UnmapViewOfFile(shm->addr) == 0) {
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73 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno,
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74 "UnmapViewOfFile(%p) of file mapping \"%V\" failed",
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75 shm->addr, &shm->name);
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76 }
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77
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78 if (CloseHandle(shm->handle) == 0) {
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79 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno,
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80 "CloseHandle() of file mapping \"%V\" failed",
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81 &shm->name);
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82 }
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83 }