gethostname3
Get/set name of current host
Usage
#include <unistd.h>
int
gethostname(char *name, size_t namelen);
int
sethostname(const char *name, int namelen);
Library
Standard C Library (libc, -lc)
Overview
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-terminated, 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 in length to {sysconf(_SC_HOST_NAME_MAX)} characters, not including the trailing null, currently 255.
Return values
The gethostname() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error.
Errors
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.
Releases
163 releases since Mac OS X 10.0; the text changed 5 times.