PROLOG

       This  manual  page  is part of the POSIX Programmer's Manual.  The Linux implementation of this interface
       may differ (consult the corresponding Linux manual page for details of Linux behavior), or the  interface
       may not be implemented on Linux.

NAME

       uname — get the name of the current system

SYNOPSIS

       #include <sys/utsname.h>

       int uname(struct utsname *name);

DESCRIPTION

       The  uname()  function shall store information identifying the current system in the structure pointed to
       by name.

       The uname() function uses the utsname structure defined in <sys/utsname.h>.

       The uname() function shall return a string naming the current system  in  the  character  array  sysname.
       Similarly,  nodename  shall contain the name of this node within an implementation-defined communications
       network. The arrays release and version shall further identify the operating system.  The  array  machine
       shall contain a name that identifies the hardware that the system is running on.

       The format of each member is implementation-defined.

RETURN VALUE

       Upon  successful completion, a non-negative value shall be returned.  Otherwise, −1 shall be returned and
       errno set to indicate the error.

ERRORS

       No errors are defined.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       The inclusion of the nodename member in this structure does not imply that it is  sufficient  information
       for interfacing to communications networks.

RATIONALE

       The  values  of  the  structure  members  are not constrained to have any relation to the version of this
       volume of POSIX.1‐2008 implemented in the operating system.  An  application  should  instead  depend  on
       _POSIX_VERSION and related constants defined in <unistd.h>.

       This volume of POSIX.1‐2008 does not define the sizes of the members of the structure and permits them to
       be of different sizes, although most implementations define them all to be the  same  size:  eight  bytes
       plus one byte for the string terminator. That size for nodename is not enough for use with many networks.

       The  uname()  function  originated  in System III, System V, and related implementations, and it does not
       exist in Version 7 or 4.3 BSD. The values it returns are set at system compile time in  those  historical
       implementations.

       4.3  BSD  has  gethostname()  and  gethostid(),  which  return  a  symbolic  name  and  a  numeric value,
       respectively. There are related sethostname() and sethostid() functions that are used to set  the  values
       the  other  two functions return. The former functions are included in this specification, the latter are
       not.

FUTURE DIRECTIONS

       None.

SEE ALSO

       The Base Definitions volume of POSIX.1‐2008, <sys_utsname.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition,
       Standard  for  Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electrical and Electronics Engineers,  Inc
       and  The  Open Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the event
       of any discrepancy between this version and the original IEEE and The Open Group Standard,  the  original
       IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at
       http://www.unix.org/online.html .

       Any typographical or formatting errors that appear in this page are most likely to have  been  introduced
       during   the   conversion  of  the  source  files  to  man  page  format.  To  report  such  errors,  see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .