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(5) 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(5), standards(5)


February 7, 2015 GETHOSTNAME(3C)