get/set name of current host
() function returns the standard
host name for the current machine, as previously set by
(). The parameter
specifies the size of the
array. If insufficient space is
provided, the returned name is truncated. The returned name is always NUL
terminated. If no space is provided, an error is returned.
() sets the name of the host machine to
, which has length
. This call is restricted to the
superuser and is normally used only when the system is bootstrapped.
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 variable
The following errors may be returned by these calls:
- The name parameter gave an
- The namelen parameter was
- The caller tried to set the hostname and was not the
() function call conforms to
X/Open Portability Guide Issue 4,
Version 2 (“XPG4.2”)
() function call appeared in
Host names are limited to
characters, currently 256. This includes the terminating NUL character. Note
that the corresponding POSIX definition
include the terminating NUL character.
If the buffer passed to gethostname
() is smaller
, other operating
systems may not guarantee termination with NUL.