rexec(SLIB)

rexec -- return stream to a remote command

Syntax

cc ... -lsocket

int
rexec (ahost, inport, user, passwd, cmd, fd2p)
char **ahost;
u_short inport;
char *user, *passwd, *cmd;
int *fd2p;

Description

rexec looks up the host *ahost using gethostbyname(SLIB), returning -1 if the host does not exist. Otherwise *ahost is set to the standard name of the host. If a user name and password are both specified, 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 Internet port to use for the connection; it will normally be the value returned from the call getservbyname(exec, tcp) (see getservent(SLIB)). The protocol for connection is described in rexecd(ADMN).

If the call succeeds, a socket of type SOCK_STREAM is returned to the caller, and given to the remote command as stdin and stdout. If fd2p is non-zero, 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 signal numbers, to be forwarded to the process group of the command. If fd2p is 0, 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.

Limitations

There is no way to specify options to the socket call which rexec makes.

rexec(SLIB)

Syntax

Description

Limitations

See also