uname

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



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.1‐2017 implemented in the
       operating system. An application should instead depend on _POSIX_VERSION
       and related constants defined in <unistd.h>.

       This volume of POSIX.1‐2017 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.1‐2017, <sys_utsname.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1-2017, Standard for Information Technology --
       Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the Institute
       of Electrical and Electronics Engineers, Inc and The Open Group.  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.opengroup.org/unix/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 .



IEEE/The Open Group                   2017                         UNAME(3POSIX)