uclibc-ng/libc/sysdeps/linux/common/fchown.c

/*
 * fchown() for uClibc
 *
 * Copyright (C) 2000-2006 Erik Andersen <andersen@codepoet.org>
 *
 * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
 */

#include <sys/syscall.h>
#include <unistd.h>
#include <bits/wordsize.h>

#if (__WORDSIZE == 32 && defined(__NR_fchown32)) || __WORDSIZE == 64
# ifdef __NR_fchown32
#  undef __NR_fchown
#  define __NR_fchown __NR_fchown32
# endif

_syscall3(int, fchown, int, fd, uid_t, owner, gid_t, group)

#else

# define __NR___syscall_fchown __NR_fchown
static __inline__ _syscall3(int, __syscall_fchown, int, fd,
		__kernel_uid_t, owner, __kernel_gid_t, group)

int fchown(int fd, uid_t owner, gid_t group)
{
	if (((owner + 1) > (uid_t) ((__kernel_uid_t) - 1U))
		|| ((group + 1) > (gid_t) ((__kernel_gid_t) - 1U))) {
		__set_errno(EINVAL);
		return -1;
	}
	return (__syscall_fchown(fd, owner, group));
}

#endif