gethostname man page


This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

gethostname — get name of current host


#include <unistd.h>

int gethostname(char *name, size_t namelen);


The gethostname() function shall return the standard host name for the current machine. The namelen argument shall specify the size of the array pointed to by the name argument. The returned name shall be null-terminated, except that if namelen is an insufficient length to hold the host name, then the returned name shall be truncated and it is unspecified whether the returned name is null-terminated.

Host names are limited to {HOST_NAME_MAX} bytes.

Return Value

Upon successful completion, 0 shall be returned; otherwise, -1 shall be returned.


No errors are defined.

The following sections are informative.

See Also

gethostid(), uname()

The Base Definitions volume of POSIX.1‐2008, <unistd.h>


2013 IEEE/The Open Group POSIX Programmer's Manual