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GETHOSTNAME(3) Library Functions Manual GETHOSTNAME(3)

gethostname, sethostnameget/set name of current host

library “libc”

#include <unistd.h>

int
gethostname(char *name, size_t namelen);

int
sethostname(const char *name, size_t namelen);

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.

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.

If the gethostname() or sethostname() functions fail, they will set errno for any of the errors specified for the routine sysctl(3).

gethostid(3), sysctl(3), sysctl(8)

The gethostname() function conforms to X/Open Portability Guide Issue 4, Version 2 (“XPG4.2”).

The gethostname function call appeared in 4.2BSD.

Host names are limited to MAXHOSTNAMELEN (from ⟨sys/param.h⟩) characters including null-termination, currently 256.

October 14, 2005 NetBSD-7.0.1