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



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

NNAAMMEE
       uname -- get the name of the current system

SSYYNNOOPPSSIISS
       #include <sys/utsname.h>

       int uname(struct utsname *_n_a_m_e);

DDEESSCCRRIIPPTTIIOONN
       The _u_n_a_m_e() function shall store information identifying the current
       system in the structure pointed to by _n_a_m_e.

       The _u_n_a_m_e() function uses the uuttssnnaammee structure defined in
       _<_s_y_s_/_u_t_s_n_a_m_e_._h_>.

       The _u_n_a_m_e() function shall return a string naming the current system in
       the character array _s_y_s_n_a_m_e.  Similarly, _n_o_d_e_n_a_m_e shall contain the
       name of this node within an implementation-defined communications
       network. The arrays _r_e_l_e_a_s_e and _v_e_r_s_i_o_n shall further identify the
       operating system. The array _m_a_c_h_i_n_e shall contain a name that
       identifies the hardware that the system is running on.

       The format of each member is implementation-defined.

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

EERRRROORRSS
       No errors are defined.

       _T_h_e _f_o_l_l_o_w_i_n_g _s_e_c_t_i_o_n_s _a_r_e _i_n_f_o_r_m_a_t_i_v_e_.

EEXXAAMMPPLLEESS
       None.

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

RRAATTIIOONNAALLEE
       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 _<_u_n_i_s_t_d_._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 _n_o_d_e_n_a_m_e is not
       enough for use with many networks.

       The _u_n_a_m_e() 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 _g_e_t_h_o_s_t_n_a_m_e() and _g_e_t_h_o_s_t_i_d(), which return a symbolic name
       and a numeric value, respectively. There are related _s_e_t_h_o_s_t_n_a_m_e() and
       _s_e_t_h_o_s_t_i_d() 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.

FFUUTTUURREE DDIIRREECCTTIIOONNSS
       None.

SSEEEE AALLSSOO
       The Base Definitions volume of POSIX.1-2017, <<ssyyss__uuttssnnaammee..hh>>

CCOOPPYYRRIIGGHHTT
       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(3)
