nativelibc/unlink.c

/*	A part of the Native C Library for Windows NT
	Copyright 2007-2015 PC GO Ld.

	This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

	This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
*/

#include <windows.h>
#include <nt.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <pathname.h>
#include <ntstatus.h>

int unlink(const char *name) {
	if(!name) {
		errno = EFAULT;
		return -1;
	}

	//int fd = open(name, O_RDONLY);
	//if(fd == -1 || close(fd) == -1) return -1;
/*
	int fd = open(name, O_DIRECTORY);
	if(fd != -1 && close(fd) != -1) {
		errno = EISDIR;
		return -1;
	}
*/
	UNICODE_STRING name1;
	RtlCreateUnicodeStringFromAsciiz(&name1, name);
	PATHNAME_UNIX2NT_UTF16_STRUCT(name1);
	OBJECT_ATTRIBUTES o = { sizeof(OBJECT_ATTRIBUTES), NULL, &name1, 0, NULL, NULL };
	void *handle;
	long int status = NtOpenSymbolicLinkObject(&handle, DELETE, &o);
	//printf("nativelibc debug: unlink: status = 0x%lx\n", status);
	if(status != STATUS_OBJECT_TYPE_MISMATCH) {
		RtlFreeUnicodeString(&name1);
		if(status < 0) {
			__set_errno_from_ntstatus(status);
			return -1;
		}
		status = NtMakeTemporaryObject(handle);
		NtClose(handle);
		return __set_errno_from_ntstatus(status) ? -1 : 0;
	}
	status = NtOpenDirectoryObject(&handle, 0, &o);
	if(status != STATUS_OBJECT_TYPE_MISMATCH) {
		RtlFreeUnicodeString(&name1);
		if(status >= 0) NtClose(handle);
		errno = EISDIR;
		return -1;
	}
	IO_STATUS_BLOCK io_status;
	unsigned long int file_share = FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE;
	unsigned long int options = FILE_NON_DIRECTORY_FILE | FILE_SYNCHRONOUS_IO_NONALERT | FILE_OPEN_FOR_BACKUP_INTENT;
	status = NtOpenFile(&handle, DELETE | SYNCHRONIZE, &o, &io_status, file_share, options);
	if(status < 0/* && status != STATUS_INVALID_PARAMETER*/) {
		RtlFreeUnicodeString(&name1);
		__set_errno_from_ntstatus(status);
		return -1;
	}
	NtClose(handle);
	status = NtDeleteFile(&o);
	RtlFreeUnicodeString(&name1);
	return __set_errno_from_ntstatus(status) ? -1 : 0;
	//return status < 0 ? -1 : 0;
}