REXEC(3)REXEC(3)NAMErexec - return stream to a remote command
SYNOPSIS
rem = rexec(ahost, inport, user, passwd, cmd, fd2p);
char **ahost;
int inport;
char *user, *passwd, *cmd;
int *fd2p;
DESCRIPTION
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 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(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 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.
SEE ALSOrcmd(3), rexecd(8C)4.2 Berkeley Distribution May 14, 1986 REXEC(3)
