gethostname manpage

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

       gethostname, sethostname - get/set host name

       #include <unistd.h>

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

       These system calls are used to access or to change the host name of the
       current processor.  The gethostname() system call returns a null-termi-
       nated  hostname	(set  earlier by sethostname()) in the array name that
       has a length of len bytes.  In case the null-terminated	hostname  does
       not  fit,  no  error  is returned, but the hostname is truncated. It is
       unspecified whether the truncated hostname will be null-terminated.

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

       EFAULT name is an invalid address.

       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.  (In this last case glibc 2.1
	      uses ENAMETOOLONG.)

       EPERM  For sethostname(), the caller did	 not  have  the	 CAP_SYS_ADMIN

       SVr4, 4.4BSD  (this interfaces first appeared in 4.2BSD).  POSIX.1-2001
       specifies gethostname() but not sethostname().

       SUSv2  guarantees  that	'Host  names  are  limited  to	 255   bytes'.
       POSIX.1-2001 guarantees that 'Host names (not including the terminating
       null byte) are limited to HOST_NAME_MAX bytes'.

       The GNU C library implements gethostname() as a library	function  that
       calls  uname(2)	and  copies up to len bytes from the returned nodename
       field into name.	 Having performed the copy, the function  then	checks
       if  the length of the nodename was greater than or equal to len, and if
       it is, then the function returns -1 with	 errno	set  to	 ENAMETOOLONG.
       Versions	 of  glibc  before 2.2 handle the case where the length of the
       nodename was greater than or  equal  to	len  differently:  nothing  is
       copied  into  name and the function returns -1 with errno set to ENAME-

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

Linux 2.6.7			  2004-06-17			GETHOSTNAME(2)
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