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When an RFC2217 socket is closed, optionally, try to drain the buffered data allowing the remote server to read and process them. First the socket is shutdown only in the transmit (write) direction. Then data are read from it (and discarded) until the server closes the other direction (read(2) returns zero). Also, don't bother trying to reset the port to its original settings before exiting, since closing the connection to the remote server will do this anyway (as per RFC2217).
57 lines
1.9 KiB
C
57 lines
1.9 KiB
C
/* vi: set sw=4 ts=4:
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*
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* tn2217.h
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*
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* TELNET and COM-PORT (RFC2217) remote terminal protocol.
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*
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* by David Leonard (https://github.com/dleonard0)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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* USA
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*/
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#ifndef TN2217_H
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#define TN2217_H
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/* Open a socket to a telnet service.
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* The port string will be of the form "<hostname>[,<port>]".
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* If the port is omitted, uses "telnet" from /etc/servcies.
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* The tn2217_ops should be used to interact with the returned fd.
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* Returns -1 on failure, and prints an error message to stderr. */
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int tn2217_open(const char *port);
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/* Close a socket to a telnet service. If "drain" is zero, the socket
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* is just close(2)ed and the return-value of close(2) is returned. If
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* "drain" is non-zero, the write-direction of the socket is first
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* shutdown, and then data are read (and discarded) from the socket,
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* until the remote end closes it (read(2) returns zero). Returns zero
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* on success, a negative on error. */
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int tn2217_close(int fd, int drain);
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struct term_ops;
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extern const struct term_ops tn2217_ops;
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#endif /* of TN2217_H */
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/***************************************************************************/
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/*
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* Local Variables:
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* mode:c
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* tab-width: 4
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* c-basic-offset: 4
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* End:
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*/
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