1  /* Copyright (C) 1994-2023 Free Software Foundation, Inc.
       2     This file is part of the GNU C Library.
       3  
       4     The GNU C Library is free software; you can redistribute it and/or
       5     modify it under the terms of the GNU Lesser General Public
       6     License as published by the Free Software Foundation; either
       7     version 2.1 of the License, or (at your option) any later version.
       8  
       9     The GNU C Library is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12     Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public
      15     License along with the GNU C Library; if not, see
      16     <https://www.gnu.org/licenses/>.  */
      17  
      18  /* Put the name of the current YP domain in no more than LEN bytes of NAME.
      19     The result is null-terminated if LEN is large enough for the full
      20     name and the terminator.  */
      21  
      22  #include <errno.h>
      23  #include <unistd.h>
      24  #include <sys/param.h>
      25  #include <sys/utsname.h>
      26  #include <string.h>
      27  
      28  #if _UTSNAME_DOMAIN_LENGTH
      29  /* The `uname' information includes the domain name.  */
      30  
      31  int
      32  getdomainname (char *name, size_t len)
      33  {
      34    struct utsname u;
      35    size_t u_len;
      36  
      37    if (uname (&u) < 0)
      38      return -1;
      39  
      40    u_len = strlen (u.domainname);
      41    memcpy (name, u.domainname, MIN (u_len + 1, len));
      42    return 0;
      43  }
      44  
      45  #else
      46  
      47  int
      48  getdomainname (char *name, size_t len)
      49  {
      50    __set_errno (ENOSYS);
      51    return -1;
      52  }
      53  
      54  stub_warning (getdomainname)
      55  
      56  #endif
      57  
      58  libc_hidden_def (getdomainname)