1REXEC(3) Library Functions Manual REXEC(3)
2
6 rexec - return stream to a remote command
7
9 rem = rexec(ahost, inport, user, passwd, cmd, fd2p);
10 char **ahost;
11 int inport;
12 char *user, *passwd, *cmd;
13 int *fd2p;
14
16 Rexec looks up the host *ahost using gethostbyname(3N), returning -1 if
17 the host does not exist. Otherwise *ahost is set to the standard name
18 of the host. If a username and password are both specified, then these
19 are used to authenticate to the foreign host; otherwise the environment
20 and then the user's .netrc file in his home directory are searched for
21 appropriate information. If all this fails, the user is prompted for
22 the information.
23 The port inport specifies which well-known DARPA Internet port to use
25 for the connection; the call ``getservbyname("exec", "tcp")'' (see get‐
26 servent(3N)) will return a pointer to a structure, which contains the
27 necessary port. The protocol for connection is described in detail in
28 rexecd(8C).
29 If the connection succeeds, a socket in the Internet domain of type
31 SOCK_STREAM is returned to the caller, and given to the remote command
32 as stdin and stdout. If fd2p is non-zero, then an auxiliary channel to
33 a control process will be setup, and a descriptor for it will be placed
34 in *fd2p. The control process will return diagnostic output from the
35 command (unit 2) on this channel, and will also accept bytes on this
36 channel as being UNIX signal numbers, to be forwarded to the process
37 group of the command. The diagnostic information returned does not
38 include remote authorization failure, as the secondary connection is
39 set up after authorization has been verified. If fd2p is 0, then the
40 stderr (unit 2 of the remote command) will be made the same as the std‐
41 out and no provision is made for sending arbitrary signals to the
42 remote process, although you may be able to get its attention by using
43 out-of-band data.
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46 rcmd(3), rexecd(8C)
474.2 Berkeley Distribution May 14, 1986 REXEC(3)