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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 the communications network to which this node is attached, if any. 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.

IEEE Std 1003.1-2001/Cor 2-2004, item XBD/TC2/D6/27 is applied, changing the description of _nodename_within the utsname structure from ``an implementation-defined communications network'' to ``the communications network to which this node is attached, if any''.

End of informative text.