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glibc  2.9
gethostname.c
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00001 /* Copyright (C) 1992, 1995, 1997, 2000, 2001 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <errno.h>
00020 #include <string.h>
00021 #include <unistd.h>
00022 #include <sys/utsname.h>
00023 
00024 /* Put the name of the current host in no more than LEN bytes of NAME.
00025    The result is null-terminated if LEN is large enough for the full
00026    name and the terminator.  */
00027 int
00028 __gethostname (name, len)
00029      char *name;
00030      size_t len;
00031 {
00032   struct utsname buf;
00033   size_t node_len;
00034 
00035   if (uname (&buf))
00036     return -1;
00037 
00038   node_len = strlen (buf.nodename) + 1;
00039   memcpy (name, buf.nodename, len < node_len ? len : node_len);
00040 
00041   if (node_len > len)
00042     {
00043       __set_errno (ENAMETOOLONG);
00044       return -1;
00045     }
00046   return 0;
00047 }
00048 
00049 weak_alias (__gethostname, gethostname)