/*
 * Copyright (c) 2017-2019, SyLabs, Inc. All rights reserved.
 * Copyright (c) 2017, SingularityWare, LLC. All rights reserved.
 * 
 * See the COPYRIGHT.md file at the top-level directory of this distribution and at
 * https://github.com/sylabs/singularity/blob/master/COPYRIGHT.md.
 * 
 * This file is part of the Singularity Linux container project. It is subject to the license
 * terms in the LICENSE.md file found in the top-level directory of this distribution and
 * at https://github.com/sylabs/singularity/blob/master/LICENSE.md. No part
 * of Singularity, including this file, may be copied, modified, propagated, or distributed
 * except according to the terms contained in the LICENSE.md file.
 * 
*/


#define _GNU_SOURCE

#include <unistd.h>
#include <errno.h>
#include <sys/syscall.h>

#include "include/message.h"

#if defined (SINGULARITY_NO_SETNS) && defined (SINGULARITY_SETNS_SYSCALL)

#include "include/setns.h"

int setns(int fd, int nstype) {
    singularity_message(DEBUG, "Using syscall() wrapped __NR_setns\n");
    return syscall(__NR_setns, fd, nstype);
}

#elif defined (SINGULARITY_NO_SETNS) && !defined (SINGULARITY_SETNS_SYSCALL)

int setns(int fd, int nstype) {
    (void)fd;
    (void)nstype;
    singularity_message(VERBOSE, "setns() not supported at compile time by kernel at time of building\n");
    errno = ENOSYS;
    return -1;
}

#endif /* SINGULARITY_NO_SETNS && SINGULARITY_SETNS_SYSCALL */