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sethostname()

Set the name of the current host

Synopsis:

#include <unistd.h>

int sethostname( const char * name, 
                 size_t namelen );

Arguments:

name

The name that you want to use for the host machine. Hostnames are limited to MAXHOSTNAMELEN characters (defined in <sys/param.h>).

namelen

The length of the name.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The sethostname() function sets the name of the host machine to be name. Only the superuser can call this function; this is normally done only at boot time.

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This function sets the value of the _CS_HOSTNAME configuration string, not that of the HOSTNAME environment variable.

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Returns:

0

Success.

-1

An error occurred (errno is set).

Errors:

EFAULT

Either name or namelen gave an invalid address.

EPERM

Although the caller wasn't the superuser, it tried to set the hostname.

Classification:

Unix

Safety:
Cancellation point	Yes
Interrupt handler	No
Signal handler	Yes
Thread	Yes

Caveats:

This function is restricted to the superuser, and is normally used only at boot time.

See also:

gethostname()

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