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/* Non-reentrant function to return the current login name. FreeBSD version.
Copyright (C) 2002 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Bruno Haible <bruno@clisp.org>, 2002.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/param.h>
#include <sysdep.h>
/* Defined in getlogin_r.c. */
extern char *__getlogin_cache;
extern char __getlogin_cache_room[MAXLOGNAME];
extern int __syscall_getlogin (char *__name, size_t __name_len);
libc_hidden_proto (__syscall_getlogin)
/* Return the login name of the user, or NULL if it can't be determined.
The returned pointer, if not NULL, is good only until the next call. */
char *
getlogin (void)
{
if (__getlogin_cache == NULL)
{
if (INLINE_SYSCALL (getlogin, 2, __getlogin_cache_room, MAXLOGNAME) < 0)
return NULL;
/* The system call should return a NULL terminated name. */
if (__memchr (__getlogin_cache_room, '\0', MAXLOGNAME) == NULL)
abort ();
__getlogin_cache = __getlogin_cache_room;
}
return (__getlogin_cache[0] ? __getlogin_cache : NULL);
}
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