rexec - return stream to a remote command
rem = rexec(ahost, inport, user, passwd, cmd, fd2p);
char *user, *passwd, *cmd;
Rexec looks up the host *ahost using gethostbyname(3N), returning -1 if the host does not
exist. Otherwise *ahost is set to the standard name of the host. If a username and pass-
word are both specified, then these are used to authenticate to the foreign host; other-
wise 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(3N)) will return a pointer to a
structure, which contains the necessary port. The protocol for connection is described in
detail in rexecd(8C).
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 setup, 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 con-
nection 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.
4.2 Berkeley Distribution May 14, 1986 REXEC(3)