gethostname(2) System Calls Manual gethostname(2)Name
gethostname, sethostname - get or set the name of the current host
The system call returns the standard host name for the current processor, as previously set by The namelen parameter specifies the size of
the name array. The returned name is null-terminated unless insufficient space is provided.
The system call sets the name of the host machine to be name, which has length namelen. This call is restricted to the superuser and is
normally used only when the system is bootstrapped.
0 If the call succeeds, it returns a value of zero.
-1 If the call fails, a value of -1 is returned and an error code is placed in the global location, errno.
Host names are limited to 31 characters and may contain only lower case ASCII characters a to z, numbers 0 to 9, dashes (-), underscores
(_), and periods (.).
The system call fails under the following condition:
[EFAULT] The name parameter points outside the process's allocated address space.
The system call fails under the following conditions:
[EPERM] The caller is not the superuser.
[EINVAL] The name or namelen parameter is an invalid address.
See Alsohostname(1), gethostid(2)gethostname(2)
Check Out this Related Man Page
GETHOSTNAME(2) System Calls Manual GETHOSTNAME(2)NAME
gethostname, sethostname - get/set name of current host
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.
If the call succeeds a value of 0 is returned. If the call fails, then a value of -1 is returned and an error code is placed in the global
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 gethostid(2)BUGS
Host names are limited to MAXHOSTNAMELEN (from <sys/param.h>) characters, currently 64.
4.2 Berkeley Distribution May 22, 1986 GETHOSTNAME(2)
stuct hosent h;
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