nativelibc/posix-io/read.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 <unistd.h>

int read(int fd, void *buffer, size_t count) {
	if(fd == STDOUT_FILENO || fd == STDERR_FILENO) {
		errno = EBADF;
		return -1;
	}
	IO_STATUS_BLOCK io_status;
	long int status = NtReadFile((void *)fd, NULL, NULL, NULL, &io_status, buffer, count, NULL, NULL);
	//printf("nativelibc debug: read: status = 0x%lx\n", status);
	if(__set_errno_from_ntstatus(status)) return -1;
	return io_status.Information;
}