Mercurial > hg > nginx
diff src/os/win32/ngx_shmem.c @ 2720:b3b8c66bd520
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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--- a/src/os/win32/ngx_shmem.c Sat Apr 18 19:13:53 2009 +0000 +++ b/src/os/win32/ngx_shmem.c Sat Apr 18 19:27:28 2009 +0000 @@ -11,31 +11,50 @@ ngx_int_t ngx_shm_alloc(ngx_shm_t *shm) { + u_char *name; + + name = ngx_alloc(shm->name.len + 2 + sizeof(NGX_INT32_LEN), shm->log); + if (name == NULL) { + return NGX_ERROR; + } + + ngx_sprintf(name, "%V_%s%Z", &shm->name, ngx_unique); + + ngx_set_errno(0); + shm->handle = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, - 0, shm->size, (char *) shm->name.data); + 0, shm->size, (char *) name); if (shm->handle == NULL) { ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno, "CreateFileMapping(%uz, %s) failed", shm->size, shm->name.data); - return NGX_ERROR; + goto failed; + } + + if (ngx_errno == ERROR_ALREADY_EXISTS) { + shm->exists = 1; } shm->addr = MapViewOfFile(shm->handle, FILE_MAP_WRITE, 0, 0, 0); - if (shm->addr == NULL) { - ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno, - "MapViewOfFile(%uz) failed", shm->size); - - if (CloseHandle(shm->handle) == 0) { - ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno, - "CloseHandle() failed"); - } - - return NGX_ERROR; + if (shm->addr != NULL) { + return NGX_OK; } - return NGX_OK; + ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno, + "MapViewOfFile(%uz) failed", shm->size); + + if (CloseHandle(shm->handle) == 0) { + ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno, + "CloseHandle() failed"); + } + +failed: + + ngx_free(name); + + return NGX_ERROR; }