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amex: Defer NVRAM file open

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This will hopefully allow us to use hook DLLs from multiple
processes simultaneously (and so the cycle goes on).
This commit is contained in:
Tau
2019-10-20 22:41:59 -04:00
parent d31d13e0da
commit bd61b3e3d9
2 changed files with 36 additions and 12 deletions
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24
amex/eeprom.c
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@ -30,6 +30,7 @@ static HRESULT eeprom_handle_write(struct irp *irp);
static HRESULT eeprom_ioctl_get_geometry(struct irp *irp);
static struct eeprom_config eeprom_config;
static HANDLE eeprom_file;
HRESULT eeprom_hook_init(const struct eeprom_config *cfg)
@ -42,11 +43,7 @@ HRESULT eeprom_hook_init(const struct eeprom_config *cfg)
return S_FALSE;
}
hr = nvram_open_file(&eeprom_file, cfg->path, 0x2000);
if (FAILED(hr)) {
return hr;
}
memcpy(&eeprom_config, cfg, sizeof(*cfg));
hr = iohook_push_handler(eeprom_handle_irp);
@ -83,11 +80,25 @@ static HRESULT eeprom_handle_irp(struct irp *irp)
static HRESULT eeprom_handle_open(struct irp *irp)
{
HRESULT hr;
if (!wstr_eq(irp->open_filename, L"$eeprom") != 0) {
return iohook_invoke_next(irp);
}
if (eeprom_file != NULL) {
dprintf("EEPROM: Already open\n");
return HRESULT_FROM_WIN32(ERROR_SHARING_VIOLATION);
}
dprintf("EEPROM: Open device\n");
hr = nvram_open_file(&eeprom_file, eeprom_config.path, 0x2000);
if (FAILED(hr)) {
return hr;
}
irp->fd = eeprom_file;
return S_OK;
@ -96,8 +107,9 @@ static HRESULT eeprom_handle_open(struct irp *irp)
static HRESULT eeprom_handle_close(struct irp *irp)
{
dprintf("EEPROM: Close device\n");
eeprom_file = NULL;
return S_OK;
return iohook_invoke_next(irp);
}
static HRESULT eeprom_handle_ioctl(struct irp *irp)