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GETHOSTNAME(3) |
Library Functions Manual |
GETHOSTNAME(3) |
NAME
gethostname, sethostname — get/set name of current host
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <unistd.h>
int
gethostname(char *name, size_t namelen);
int
sethostname(const char *name, size_t namelen);
DESCRIPTION
gethostname() returns the standard host name for the current processor, as previously set by
sethostname(). The parameter
namelen specifies the size of the
name array. The returned name is null-terminated unless insufficient space is provided.
sethostname() sets the name of the host machine to be name, which has length namelen. This call is restricted to the super-user and is normally used only when the system is bootstrapped.
RETURN VALUES
If the call succeeds a value of 0 is returned. If the call fails, a value of -1 is returned and an error code is placed in the global location errno.
ERRORS
If the
gethostname() or
sethostname() functions fail, they will set
errno for any of the errors specified for the routine
sysctl(3).
STANDARDS
The gethostname() function conforms to X/Open Portability Guide Issue 4, Version 2 (“XPG4.2”).
HISTORY
The gethostname function call appeared in 4.2BSD.
BUGS
Host names are limited to MAXHOSTNAMELEN (from <sys/param.h>) characters including null-termination, currently 256.