REXEC(3) BSD Programmer's Manual REXEC(3)NAMErexec - return stream to a remote command
SYNOPSIS
int
rexec(ahost, int inport, char *user, char *passwd, char *cmd, int *fd2p);
DESCRIPTION
This interface is obsoleted by rcmd(3). It is available from the compati-
bility library, libcompat.
The rexec() function looks up the host *ahost using gethostbyname(3), re-
turning -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(3)) will return a pointer to a structure, which contains the
necessary port.
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 set up, 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 au-
thorization failure, as the secondary connection is set up after authori-
zation 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)HISTORY
The rexec() function appeared in 4.2BSD.
MirOS BSD #10-current June 4, 1993 1
