REXEC(3) | Library Functions Manual | REXEC(3) |
rexec
—
rexec
(char
**ahost, int inport,
char *user,
char *passwd,
char *cmd,
int *fd2p);
The rexec
() function looks up the host
*ahost using
gethostbyname(3),
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(3)) will return
a pointer to a structure, which contains the necessary port. The protocol
for connection is described in detail in
rexecd(8).
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 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.
rexec
() function appeared in
4.2BSD.
June 4, 1993 | NetBSD 9.2 |