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Name

Synopsis

cc [ flag ... ] file ... -lsocket -lnsl [ library ... ]

int rexec(char **ahost, unsigned short inport, const char *user, const char *passwd, const char *cmd, int *fd2p);

MT-Level

Unsafe

Description

rexec() looks up the host *ahost using gethostbyname(3N) , 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 user’s .netrc file in his home directory is 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 protocol for connection is described in detail in in.rexecd(1M) .

If the call succeeds, a socket of type SOCK_STREAM is returned to the caller, and given to the remote command as its standard input and standard output. If fd2p is non-zero, then an auxiliary channel to a control process will be setup, and a file descriptor for it will be placed in *fd2p. The control process will return diagnostic output (file descriptor 2, the standard error) from the command on this channel, and will also accept bytes on this channel as signal numbers, to be forwarded to the process group of the command. If fd2p is 0, then the standard error (file descriptor 2 of the remote command) will be made the same as its standard output 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.

Return Values

If rexec() fails, -1 is returned.

See Also

Notes

There is no way to specify options to the socket() call that rexec() makes.

This interface is unsafe in multithreaded applications. Unsafe interfaces should be called only from the main thread.

Table of Contents

• Name
• Synopsis
• MT-Level
• Description
• Return Values
• See Also
• Notes