posix/uname.c

   1 /* uname -- Report basic information about the system.  Generic version.
   2    Copyright (C) 1991-2017 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <string.h>
  21 #include <sys/utsname.h>
  22 #include <unistd.h>
  23
  24 /* This file defines UNAME_* to string constants.  */
  25 #include <uname-values.h>
  26
  27 /* Put information about the system in NAME.  */
  28 int
  29 __uname (struct utsname *name)
  30 {
  31   int save;
  32
  33   if (name == NULL)
  34     {
  35       __set_errno (EINVAL);
  36       return -1;
  37     }
  38
  39   save = errno;
  40   if (__gethostname (name->nodename, sizeof (name->nodename)) < 0)
  41     {
  42       if (errno == ENOSYS)
  43         {
  44           /* Hostname is meaningless for this machine.  */
  45           name->nodename[0] = '\0';
  46           __set_errno (save);
  47         }
  48 #ifdef  ENAMETOOLONG
  49       else if (errno == ENAMETOOLONG)
  50         /* The name was truncated.  */
  51         __set_errno (save);
  52 #endif
  53       else
  54         return -1;
  55     }
  56   strncpy (name->sysname, UNAME_SYSNAME, sizeof (name->sysname));
  57   strncpy (name->release, UNAME_RELEASE, sizeof (name->release));
  58   strncpy (name->version, UNAME_VERSION, sizeof (name->version));
  59   strncpy (name->machine, UNAME_MACHINE, sizeof (name->machine));
  60
  61   return 0;
  62 }
  63 weak_alias (__uname, uname)
  64 libc_hidden_def (__uname)
  65 libc_hidden_def (uname)