nativelibc/process/waitpid.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>
#include <process.h>

pid_t waitpid(pid_t pid, int *status, int options) {
	void *handle;
	if(pid <= 0 || options) {
		errno = ENOSYS;
		return -1;
	}
	if(__child_process_table_search_handle_and_clean(pid, &handle) < 0) {
		errno = ECHILD;
		return -1;
	}
	NtWaitForSingleObject(handle, 0, NULL);
	if(status) {
		PROCESS_BASIC_INFORMATION pbi;
		long int ntstatus = NtQueryInformationProcess(handle, ProcessBasicInformation, &pbi, sizeof pbi, NULL);
		if(ntstatus < 0) {
			NtClose(handle);
			__set_errno_from_ntstatus(ntstatus);
			return -1;
		}
		*status = pbi.ExitStatus;
	}
	NtClose(handle);
	return pid;
}