int
rexec(
char **ahost
, int inport
, char *user
, char *passwd
, char *cmd
, int *fd2p
)
The
rexec()
function looks up the host
*ahost
using
gethostbyname(3),
returning -1 if the host does not exist.
Otherwise
*ahost
is set to the standard name of the host.
If a username and password are both specified, then these
are used to authenticate to the foreign host; otherwise
the environment and then the user's
.netrc
file in his home directory are searched for appropriate information.
If all this fails, the user is prompted for the information.
The port
inport
specifies which well-known
DARPA
Internet port to use for the connection; the call
`getservbyname("exec", "tcp")'
(see
getservent(3))
will return a pointer to a structure, which contains the
necessary port.
The protocol for connection is described in detail in
rexecd(8).
If the connection succeeds, a socket in the Internet domain of type
SOCK_STREAM
is returned to the caller, and given to the remote command as
stdin
and
stdout.
If
fd2p
is non-zero, then an auxiliary channel to a control
process will be set up, and a descriptor for it will be placed
in
*fd2p
.
The control process will return diagnostic
output from the command (unit 2) on this channel, and will also
accept bytes on this channel as being
UNIX
signal numbers, to be forwarded to the process group of the command.
The diagnostic information returned does not include remote authorization
failure, as the secondary connection is set up after authorization has been
verified.
If
fd2p
is 0, then the
stderr
(unit 2 of the remote command) will be made the same as the
stdout
and no
provision is made for sending arbitrary signals to the remote process,
although you may be able to get its attention by using out-of-band data.
)
function appeared in
4.2BSD.