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

PROLOG         top

       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         top

       uname — get the name of the current system

SYNOPSIS         top

       #include <sys/utsname.h>

       int uname(struct utsname *name);

DESCRIPTION         top

       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

       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         top

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

ERRORS         top

       No errors are defined.

       The following sections are informative.

EXAMPLES         top



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

RATIONALE         top

       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

       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.



SEE ALSO         top

       The Base Definitions volume of POSIX.1‐2008, sys_utsname.h(0p)

COPYRIGHT         top

       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 .

       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 .

IEEE/The Open Group                 2013                           UNAME(3P)