REXEC(3N)REXEC(3N)NAMErexec - return stream to a remote command
SYNOPSIS
int rexec(char **ahost, int inport, char *user, char *passwd,
char *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(1M). NOTE: password aging is not supported by the the rexecd(1M)
daemon in this implementation.
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.
DIAGNOSTICS
Rexec returns a valid socket descriptor on success. It returns -1 on
error and prints a diagnostic message on the standard error.
SEE ALSOrcmd(3N), rexecd(1M)
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