gethostname man page on 4.4BSD

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GETHOSTNAME(3)		 BSD Library Functions Manual		GETHOSTNAME(3)

NAME
     gethostname, sethostname — get/set name of current host

SYNOPSIS
     #include <unistd.h>

     int
     gethostname(char *name, int namelen);

     int
     sethostname(const char *name, int namelen);

DESCRIPTION
     Gethostname() returns the standard host name for the current processor,
     as previously set by sethostname().  The parameter namelen specifies the
     size of the name array.  The returned name is null-terminated unless
     insufficient space is provided.

     Sethostname() sets the name of the host machine to be name, which has
     length namelen.  This call is restricted to the super-user and is nor‐
     mally used only when the system is bootstrapped.

RETURN VALUES
     If the call succeeds a value of 0 is returned.  If the call fails, a
     value of -1 is returned and an error code is placed in the global loca‐
     tion errno.

ERRORS
     The following errors may be returned by these calls:

     [EFAULT]		The name or namelen parameter gave an invalid address.

     [EPERM]		The caller tried to set the hostname and was not the
			super-user.

SEE ALSO
     sysctl(2) gethostid(3)

BUGS
     Host names are limited to MAXHOSTNAMELEN (from ⟨sys/param.h⟩) characters,
     currently 256.

HISTORY
     The gethostname function call appeared in 4.2BSD.

4.2 Berkeley Distribution	 June 4, 1993	     4.2 Berkeley Distribution
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