posix/uname.c

   1 /* uname -- Report basic information about the system.  Generic version.
   2    Copyright (C) 1991-2015 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 (name)
  30      struct utsname *name;
  31 {
  32   int save;
  33
  34   if (name == NULL)
  35     {
  36       __set_errno (EINVAL);
  37       return -1;
  38     }
  39
  40   save = errno;
  41   if (__gethostname (name->nodename, sizeof (name->nodename)) < 0)
  42     {
  43       if (errno == ENOSYS)
  44         {
  45           /* Hostname is meaningless for this machine.  */
  46           name->nodename[0] = '\0';
  47           __set_errno (save);
  48         }
  49 #ifdef  ENAMETOOLONG
  50       else if (errno == ENAMETOOLONG)
  51         /* The name was truncated.  */
  52         __set_errno (save);
  53 #endif
  54       else
  55         return -1;
  56     }
  57   strncpy (name->sysname, UNAME_SYSNAME, sizeof (name->sysname));
  58   strncpy (name->release, UNAME_RELEASE, sizeof (name->release));
  59   strncpy (name->version, UNAME_VERSION, sizeof (name->version));
  60   strncpy (name->machine, UNAME_MACHINE, sizeof (name->machine));
  61
  62   return 0;
  63 }
  64 weak_alias (__uname, uname)
  65 libc_hidden_def (__uname)
  66 libc_hidden_def (uname)