GETHOSTNAME(3) BSD Library Functions Manual GETHOSTNAME(3)
gethostname, sethostname -- get/set name of current host
Standard C Library (libc, -lc)
gethostname(char *name, size_t namelen);
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 nor-
mally 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 loca-
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 BSD