/*
 * Copyright 2002-2009, Axel Dörfler, axeld@pinc-software.de.
 * Distributed under the terms of the MIT License.
 */


#include <errno.h>
#include <unistd.h>

#include <NodeMonitor.h>

#include <errno_private.h>
#include <syscalls.h>
#include <syscall_utils.h>


static int
common_chown(int fd, const char* path, bool followLinks, uid_t owner,
        gid_t group)
{
        struct stat stat;
        status_t status;

        int mask = 0;
        if (owner != (uid_t)-1) {
                stat.st_uid = owner;
                mask |= B_STAT_UID;
        }
        if (group != (gid_t)-1) {
                stat.st_gid = group;
                mask |= B_STAT_GID;
        }

        status = _kern_write_stat(fd, path, followLinks, &stat,
                sizeof(struct stat), mask);

        RETURN_AND_SET_ERRNO(status);
}


int
chown(const char *path, uid_t owner, gid_t group)
{
        return common_chown(AT_FDCWD, path, true, owner, group);
}


int
lchown(const char *path, uid_t owner, gid_t group)
{
        return common_chown(AT_FDCWD, path, false, owner, group);
}


int
fchown(int fd, uid_t owner, gid_t group)
{
        return common_chown(fd, NULL, false, owner, group);
}


int
fchownat(int fd, const char* path, uid_t owner, gid_t group, int flag)
{
        return common_chown(fd, path, (flag & AT_SYMLINK_NOFOLLOW) == 0, owner,
                group);
}