GETHOSTNAME

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
CONFORMING TO
BUGS
NOTES
SEE ALSO

NAME

gethostname, sethostname − get/set host name

SYNOPSIS

#include <unistd.h>

int gethostname(char *name, size_t len);
int sethostname(const char *
name, size_t len);

DESCRIPTION

These functions are used to access or to change the host name of the current processor.

RETURN VALUE

On success, zero is returned. On error, −1 is returned, and errno is set appropriately.

ERRORS

EINVAL

len is negative or, for sethostname, len is larger than the maximum allowed size, or, for gethostname on Linux/i386, len is smaller than the actual size.

EPERM

For sethostname, the caller was not the superuser.

EFAULT

name is an invalid address.

CONFORMING TO

SVr4, 4.4BSD (this function first appeared in 4.2BSD). POSIX.1 does not define these functions, but ISO/IEC 9945-1:1990 mentions them in B.4.4.1.

BUGS

Some other implementations of gethostname successfully return len bytes even if name is longer. Linux/Alpha complies with this behaviour. Linux/i386, however, returns EINVAL in this case (as of DLL 4.6.27 libraries).

NOTES

Under Linux/Alpha, gethostname is a system call. Under Linux/i386, gethostname is implemented at the library level by calling uname(2).

SEE ALSO

getdomainname(2), setdomainname(2), uname(2)