rexec.3x

<B>Digital的Unix操作系统VAX 4.2源码</B>

.\" SCCSID: @(#)rexec.3x	8.1	9/11/90
.TH rexec 3x
.SH Name
rexec \- return stream to a remote command
.SH Syntax
.nf
.B "rem = rexec(ahost, inport, user, passwd, cmd, fd2p);"
.B char **ahost;
.B u_short inport;
.B "char *user, *passwd, *cmd;"
.B int *fd2p;
.fi
.SH Description
.NXR "rexec subroutine"
.NXAM "rmt program" "rexec subroutine"
.NXR "stream" "returning to remote command"
The
.PN rexec
subroutine looks up the host
.I *ahost
using
.PN gethostbyname ,
returning \-1 if the host does not exist.
For further information, see 
.MS gethostent 3n .
Otherwise
.I *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.
If all this fails, the user is prompted for the information.
.PP
The port
.I inport
specifies which well-known DARPA Internet port to use for
the connection; it will normally be the value returned from
the call ``getservbyname("exec", "tcp")''.  For further
information, see 
.MS getservent 3n .
The protocol for connection is described in detail in
.MS rexecd 8c .
.PP
If the call succeeds, a socket of type SOCK_STREAM is returned to
the caller and given to the remote command as
.B stdin
and
.BR stdout .
If
.I fd2p
is nonzero, then an auxiliary channel to a control
process will be set up, and a descriptor for it will be placed
in
.IR *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.
If
.I fd2p
is 0, then the 
.B stderr
(unit 2 of the remote
command) will be made the same as the 
.B 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.
.SH See Also
gethostent(3n), getservent(3n), rcmd(3x), rexecd(8c)