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RedHat 9 (Linux i386) - man page for getdomainname (redhat section 2)

GETDOMAINNAME(2)					     Linux Programmer's Manual						  GETDOMAINNAME(2)

NAME
getdomainname, setdomainname - get/set domain name
SYNOPSIS
#include <unistd.h> int getdomainname(char *name, size_t len); int setdomainname(const char *name, size_t len);
DESCRIPTION
These functions are used to access or to change the domain name of the current processor. If the NUL-terminated domain name requires more than len bytes, getdomainname returns the first len bytes (glibc) or returns an error (libc).
RETURN VALUE
On success, zero is returned. On error, -1 is returned, and errno is set appropriately.
ERRORS
EINVAL For getdomainname under libc: name is NULL or name is longer than len bytes. EINVAL For setdomainname: len was negative or too large. EPERM For setdomainname: the caller was not the superuser. EFAULT For setdomainname: name pointed outside of user address space.
CONFORMING TO
POSIX does not specify these calls.
SEE ALSO
gethostname(2), sethostname(2), uname(2) Linux 2.0 1997-08-25 GETDOMAINNAME(2)