GETHOSTNAME(3C) Standard C Library Functions GETHOSTNAME(3C)
gethostname, sethostname - get or set name of current host
#include <unistd.h>
int gethostname(char *name, int namelen);
int sethostname(char *name, int namelen);
The gethostname() function returns the standard host name for the
current machine, as previously set by sethostname(). The namelen
argument specifies the size of the array pointed to by name. 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
superuser and is normally used only when the system is bootstrapped.
Host names are limited to MAXHOSTNAMELEN characters, currently 256,
defined in the <netdb.h> header.
Upon successful completion, gethostname() and sethostname() return 0.
Otherwise, they return -1 and set errno to indicate the error.
The gethostname() and sethostname() functions will fail if:
EFAULT
The name or namelen argument gave an invalid address.
The sethostname() function will fail if:
EPERM
The {PRIV_SYS_ADMIN} privilege was not asserted in the
effective set of the calling process.
See attributes(7) for descriptions of the following attributes:
+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Interface Stability | Standard |
+--------------------+-----------------+
|MT-Level | MT-Safe |
+--------------------+-----------------+
sysinfo(2), uname(2), gethostid(3C), attributes(7), standards(7)
February 7, 2015 GETHOSTNAME(3C)
NAME
gethostname, sethostname - get or set name of current host
SYNOPSIS
#include <unistd.h>
int gethostname(char *name, int namelen);
int sethostname(char *name, int namelen);
DESCRIPTION
The gethostname() function returns the standard host name for the
current machine, as previously set by sethostname(). The namelen
argument specifies the size of the array pointed to by name. 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
superuser and is normally used only when the system is bootstrapped.
Host names are limited to MAXHOSTNAMELEN characters, currently 256,
defined in the <netdb.h> header.
RETURN VALUES
Upon successful completion, gethostname() and sethostname() return 0.
Otherwise, they return -1 and set errno to indicate the error.
ERRORS
The gethostname() and sethostname() functions will fail if:
EFAULT
The name or namelen argument gave an invalid address.
The sethostname() function will fail if:
EPERM
The {PRIV_SYS_ADMIN} privilege was not asserted in the
effective set of the calling process.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Interface Stability | Standard |
+--------------------+-----------------+
|MT-Level | MT-Safe |
+--------------------+-----------------+
SEE ALSO
sysinfo(2), uname(2), gethostid(3C), attributes(7), standards(7)
February 7, 2015 GETHOSTNAME(3C)