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Linux 2.6 - man page for uname (linux section 3posix)

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

       uname - get the name of the current system

       #include <sys/utsname.h>

       int uname(struct utsname *name);

       The  uname() function shall store information identifying the current system in the struc-
       ture 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 implemen-
       tation-defined communications network. The arrays release and version shall further  iden-
       tify  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.

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

       No errors are defined.

       The following sections are informative.


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

       The values of the structure members are not constrained to have any relation to	the  ver-
       sion of this volume of IEEE Std 1003.1-2001 implemented in the operating system. An appli-
       cation  should  instead	depend	on  _POSIX_VERSION  and  related  constants  defined   in

       This volume of IEEE Std 1003.1-2001 does not define the sizes of the members of the struc-
       ture 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.


       The Base Definitions volume of IEEE Std 1003.1-2001, <sys/utsname.h>

       Portions  of  this  text  are  reprinted  and  reproduced in electronic form from IEEE Std
       1003.1, 2003 Edition, Standard for Information Technology  --  Portable	Operating  System
       Interface  (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 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 orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003					 UNAME(P)

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