DragonFly On-Line Manual Pages

Search: Section:  

GETHOSTNAME(3)        DragonFly Library Functions Manual        GETHOSTNAME(3)


gethostname, sethostname -- get/set name of current host


Standard C Library (libc, -lc)


#include <unistd.h> int gethostname(char *name, size_t namelen); int sethostname(const char *name, int namelen);


The gethostname() function returns the standard host name for the current processor, as previously set by sethostname(). The namelen argument specifies the size of the name array. The returned name is null-termi- nated unless insufficient space is provided. The sethostname() function 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. Host names are limited to {HOST_NAME_MAX} characters, not including the trailing null, currently 255.


Upon successful completion, the value 0 is returned; otherwise the value -1 is returned and the global variable errno is set to indicate the error.


The following errors may be returned by these calls: [EFAULT] The name or namelen argument gave an invalid address. [ENAMETOOLONG] The current host name is longer than namelen. (For gethostname() only.) [EPERM] The caller tried to set the host name and was not the super-user.


sysconf(3), sysctl(3)


The gethostname() function conforms to IEEE Std 1003.1-2001 (``POSIX.1''). Callers should be aware that {HOST_NAME_MAX} may be vari- able or infinite, but is guaranteed to be no less than {_POSIX_HOST_NAME_MAX}. On older systems, this limit was defined in the non-standard header <sys/param.h> as MAXHOSTNAMELEN, and counted the ter- minating null. The sethostname() function and the error returns for gethostname() are not standardized.


The gethostname() function appeared in 4.2BSD. The namelen argument to gethostname() was changed to size_t in FreeBSD 5.2 for alignment with IEEE Std 1003.1-2001 (``POSIX.1''). DragonFly 3.5 August 18, 2003 DragonFly 3.5

Search: Section: