utsname.h(7posix) [posix man page]

<sys/utsname.h>(P)					     POSIX Programmer's Manual						<sys/utsname.h>(P)

NAME

       sys/utsname.h - system name structure

SYNOPSIS

       #include <sys/utsname.h>

DESCRIPTION

       The <sys/utsname.h> header shall define the structure utsname which shall include at least the following members:

	      char  sysname[]  Name of this implementation of the operating system.
	      char  nodename[] Name of this node within an implementation-defined
			       communications network.
	      char  release[]  Current release level of this implementation.
	      char  version[]  Current version level of this release.
	      char  machine[]  Name of the hardware type on which the system is running.

       The character arrays are of unspecified size, but the data stored in them shall be terminated by a null byte.

       The following shall be declared as a function and may also be defined as a macro:

	      int uname(struct utsname *);

       The following sections are informative.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       The System Interfaces volume of IEEE Std 1003.1-2001, uname()

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- 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 original Standard can  be  obtained
       online at http://www.opengroup.org/unix/online.html .

IEEE
/The Open Group						       2003							<sys/utsname.h>(P)

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

PROLOG

       This  manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (consult the correspond-
       ing 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 oper-
       ating 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 IEEE Std 1003.1-2001 imple-
       mented in the operating system. An application should instead depend on _POSIX_VERSION and related constants defined in <unistd.h>.

       This volume of IEEE Std 1003.1-2001 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 node-
       name 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  speci-
       fication, the latter are not.

FUTURE DIRECTIONS

       None.

SEE ALSO

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

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- 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 original Standard can  be  obtained
       online at http://www.opengroup.org/unix/online.html .

IEEE
/The Open Group						       2003								 UNAME(3P)