gethostname, sethostname - get/set name of current host
gethostname(char *name, size_t namelen);
sethostname(const char *name, size_t namelen);
The gethostname() function returns the standard host name
for the current
processor, as previously set by sethostname(). The parameter namelen
specifies the size of the name array. If insufficient space
the returned name is truncated. The returned name is always
sethostname() sets the name of the host machine to be name,
length namelen. 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
The following errors may be returned by these calls:
[EFAULT] The name or namelen parameter gave an invalid
[EPERM] The caller tried to set the hostname and was
not the superuser.
hostname(1), getdomainname(3), gethostid(3), sysctl(3),
The gethostname() function call conforms to X/Open Portability Guide
Issue 4.2 (``XPG4.2'').
The gethostname() function call appeared in 4.2BSD.
Host names are limited to MAXHOSTNAMELEN (from
currently 256. This includes the terminating NUL character.
If the buffer passed to gethostname() is smaller than MAXHOSTNAMELEN,
other operating systems may not guarantee termination with
OpenBSD 3.6 June 4, 1993
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