nodename(4) [sunos man page]

nodename(4)							   File Formats 						       nodename(4)

NAME

       nodename - local source for system name

SYNOPSIS

       /etc/nodename

DESCRIPTION

       When  a	machine is standalone or its IP address is configured locally, the /etc/nodename file contains the system name. By convention, the
       system name is the same as the hostname associated with the IP address of the primary network interface, for example, hostname.hme0.

       If the machine's network configuration is delivered by the RPC bootparams protocol, the /etc/nodename file is not used, as the system  name
       is delivered by the remote service.

       Given a system name value, regardless of source, the uname utility invoked with the -S option is used to set the system name of the running
       system.

       If the machine's network configuration is delivered by the DHCP protocol, the /etc/nodename file is used only if the DHCP server  does  not
       provide a value for the Hostname option (DHCP standard option code 12).

       A system name configured in /etc/nodename should be unique within the system's name service domain in order to ensure that any network ser-
       vices provided by the system will operate correctly.

       Given a system name value, regardless of source, the uname utility invoked with the -S option is used to set the system name of the running
       system.

EXAMPLES

       Example 1: Syntax

       The syntax for nodename consists of a single line containing the system's name. For example, for a system named myhost:

       myhost

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       nis+(1), uname(1), named(1M), ypbind(1M), attributes(5)

NOTES

       The nodename file is modified by Solaris installation and de-installation scripts.

SunOS 5.10							    9 Feb 2004							       nodename(4)

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

NAME

       uname - get name and information about current kernel

SYNOPSIS

       #include <sys/utsname.h>

       int uname(struct utsname *buf);

DESCRIPTION

       uname returns system information in the structure pointed to by buf.  The utsname struct is defined in <sys/utsname.h>:
	      struct utsname {
		      char sysname[];
		      char nodename[];
		      char release[];
		      char version[];
		      char machine[];
	      #ifdef _GNU_SOURCE
		      char domainname[];
	      #endif
	      };
       The length of the arrays in a struct utsname is unspecified; the fields are NUL-terminated.

RETURN VALUE

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

ERRORS

       EFAULT buf is not valid.

CONFORMING TO

       SVr4, SVID, POSIX, X/OPEN.  There is no uname call in BSD 4.3.

       The domainname member (the NIS or YP domain name) is a GNU extension.

NOTES

       This  is  a  system  call, and the operating system presumably knows its name, release and version. It also knows what hardware it runs on.
       So, four of the fields of the struct are meaningful.  On the other hand, the field nodename is  meaningless:  it  gives	the  name  of  the
       present machine in some undefined network, but typically machines are in more than one network and have several names. Moreover, the kernel
       has no way of knowing about such things, so it has to be told what to answer here.  The same holds for the additional domainname field.

       To this end Linux uses the system calls sethostname(2) and setdomainname(2).  Note that there is no standard that says  that  the  hostname
       set by sethostname(2) is the same string as the nodename field of the struct returned by uname (indeed, some systems allow a 256-byte host-
       name and an 8-byte nodename), but this is true on Linux. The same holds for setdomainname(2) and the domainname field.

       The length of the fields in the struct varies. Some operating systems or libraries use a hardcoded 9 or 33 or 65 or 257. Other systems  use
       SYS_NMLN  or _SYS_NMLN or UTSLEN or _UTSNAME_LENGTH. Clearly, it is a bad idea to use any of these constants - just use sizeof(...).  Often
       257 is chosen in order to have room for an internet hostname.

       There have been three Linux system calls uname(). The first one used length 9, the second one used 65, the third one also uses 65 but  adds
       the domainname field.

       Part of the utsname information is also accessible via sysctl and via /proc/sys/kernel/{ostype, hostname, osrelease, version, domainname}.

SEE ALSO

       uname(1), getdomainname(2), gethostname(2)

Linux 2.5.0							    2001-12-15								  UNAME(2)