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/*
* Copyright (C) Igor Sysoev
*/
#include <ngx_config.h>
#include <ngx_core.h>
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 *) name);
if (shm->handle == NULL) {
ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno,
"CreateFileMapping(%uz, %s) failed",
shm->size, shm->name.data);
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) {
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;
}
void
ngx_shm_free(ngx_shm_t *shm)
{
if (UnmapViewOfFile(shm->addr) == 0) {
ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno,
"UnmapViewOfFile(%p) failed", shm->addr);
}
if (CloseHandle(shm->handle) == 0) {
ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno,
"CloseHandle() failed");
}
}
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