1UNAME(3P)                  POSIX Programmer's Manual                 UNAME(3P)
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PROLOG

6       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
7       implementation of this interface may differ (consult the  corresponding
8       Linux  manual page for details of Linux behavior), or the interface may
9       not be implemented on Linux.
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11

NAME

13       uname — get the name of the current system
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SYNOPSIS

16       #include <sys/utsname.h>
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18       int uname(struct utsname *name);
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DESCRIPTION

21       The uname() function shall store information  identifying  the  current
22       system in the structure pointed to by name.
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24       The   uname()   function   uses   the   utsname  structure  defined  in
25       <sys/utsname.h>.
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27       The uname() function shall return a string naming the current system in
28       the  character  array  sysname.   Similarly, nodename shall contain the
29       name of this node within an implementation-defined communications  net‐
30       work. The arrays release and version shall further identify the operat‐
31       ing system. The array machine shall contain a name that identifies  the
32       hardware that the system is running on.
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34       The format of each member is implementation-defined.
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RETURN VALUE

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

41       No errors are defined.
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43       The following sections are informative.
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EXAMPLES

46       None.
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APPLICATION USAGE

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

54       The values of the structure members are not  constrained  to  have  any
55       relation  to  the version of this volume of POSIX.1‐2008 implemented in
56       the  operating  system.  An  application  should  instead   depend   on
57       _POSIX_VERSION and related constants defined in <unistd.h>.
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59       This volume of POSIX.1‐2008 does not define the sizes of the members of
60       the structure and permits them to be of different sizes, although  most
61       implementations  define  them all to be the same size: eight bytes plus
62       one byte for the string terminator.  That  size  for  nodename  is  not
63       enough for use with many networks.
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65       The  uname()  function  originated in System III, System V, and related
66       implementations, and it does not exist in Version 7  or  4.3  BSD.  The
67       values  it  returns  are set at system compile time in those historical
68       implementations.
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70       4.3 BSD has gethostname() and gethostid(), which return a symbolic name
71       and  a numeric value, respectively. There are related sethostname() and
72       sethostid() functions that are used to set the  values  the  other  two
73       functions  return. The former functions are included in this specifica‐
74       tion, the latter are not.
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FUTURE DIRECTIONS

77       None.
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SEE ALSO

80       The Base Definitions volume of POSIX.1‐2008, <sys_utsname.h>
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83       Portions of this text are reprinted and reproduced in  electronic  form
84       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
85       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
86       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
87       cal and Electronics Engineers,  Inc  and  The  Open  Group.   (This  is
88       POSIX.1-2008  with  the  2013  Technical Corrigendum 1 applied.) In the
89       event of any discrepancy between this version and the original IEEE and
90       The  Open Group Standard, the original IEEE and The Open Group Standard
91       is the referee document. The original Standard can be  obtained  online
92       at http://www.unix.org/online.html .
93
94       Any  typographical  or  formatting  errors that appear in this page are
95       most likely to have been introduced during the conversion of the source
96       files  to  man page format. To report such errors, see https://www.ker
97       nel.org/doc/man-pages/reporting_bugs.html .
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101IEEE/The Open Group                  2013                            UNAME(3P)
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