06-14-2013
Well, the loss of DSR or CTS or even effectively a break (long zero) might also be what is detected. An rs232 can be as little as three wires, SD, RD and ground, emulating a current loop connection. Does stty have other lead watchers you might turn on? Can you put a breakout box on and see what leads are live as senders or receivers, or just a volt-ohm-meter, as even receivers usually have voltage or resistance you can sense?
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LEARN ABOUT DEBIAN
sctp_peeloff
SCTP_PEELOFF(3) Linux Programmer's Manual SCTP_PEELOFF(3)
NAME
sctp_peeloff - Branch off an association into a separate socket.
SYNOPSIS
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/sctp.h>
int sctp_peeloff(int sd, sctp_assoc_t assoc_id);
DESCRIPTION
sctp_peeloff branches off an existing association assoc_id on a one-to-many style socket sd into a separate socket. The new socket is a
one-to-one style socket.
This is particularly desirable when, for instance, the application wishes to have a number of sporadic message senders/receivers remain
under the original one-to-many style socket, but branch off those assocations carrying high volume data traffic into their own separate
socket descriptors.
RETURN VALUE
On success, the new socket descriptor representing the branched-off asociation is returned. On error, -1 is returned, and errno is set
appropriately.
ERRORS
EBADF sd is not a valid descriptor.
EINVAL The assoc id passed is invalid or if the socket is a one-to-one style socket.
ENOTSOCK
Argument is a descriptor for a file, not a socket.
SEE ALSO
sctp(7) sctp_bindx(3), sctp_connectx(3), sctp_sendmsg(3), sctp_send(3), sctp_recvmsg(3), sctp_getpaddrs(3), sctp_getladdrs(3),
sctp_opt_info(3),
Linux 2.6 2005-10-25 SCTP_PEELOFF(3)