REXEC(3)						     Library Functions Manual							  REXEC(3)

NAME

       rexec - 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 ALSO

       rcmd(3), rexecd(8C)

4.2 Berkeley Distribution					   May 14, 1986 							  REXEC(3)