GETHOSTNAME(3C) Standard C Library Functions GETHOSTNAME(3C)
NAME
gethostname, sethostname - get or set name of current host
SYNOPSIS
#include <unistd.h>
int gethostname(
char *name,
int namelen);
int sethostname(
char *name,
int namelen);
DESCRIPTION
The
gethostname() function returns the standard host name for the
current machine, as previously set by
sethostname(). The
namelen argument specifies the size of the array pointed to by
name. The
returned name is null-terminated unless insufficient space is
provided.
The
sethostname() function 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.
Host names are limited to
MAXHOSTNAMELEN characters, currently 256,
defined in the <
netdb.h> header.
RETURN VALUES
Upon successful completion,
gethostname() and
sethostname() return 0.
Otherwise, they return -1 and set
errno to indicate the error.
ERRORS
The
gethostname() and
sethostname() functions will fail if:
EFAULT The
name or
namelen argument gave an invalid address.
The
sethostname() function will fail if:
EPERM The {
PRIV_SYS_ADMIN} privilege was not asserted in the
effective set of the calling process.
ATTRIBUTES
See
attributes(7) for descriptions of the following attributes:
+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Interface Stability | Standard |
+--------------------+-----------------+
|MT-Level | MT-Safe |
+--------------------+-----------------+
SEE ALSO
sysinfo(2),
uname(2),
gethostid(3C),
attributes(7),
standards(7) February 7, 2015 GETHOSTNAME(3C)
