05-26-2003
What version of Solaris are you running? The connection fudge factor may be scaling out of control for you.
Performance addressing: Threading will add some performance problems since it's constantly opening and closing the fd. Blocking is the correct way to address threaded writes to a fd (since it will wait for all oddities of tcp)- In comparing a read / write test of 1024 bytes in Stevens' UNIX Network Programming (1998), you see how an un blocked, non threaded program took 8.8 seconds to transfer, while a non threaded version with out blocking, did the same xfer in .3 seconds. Hardware in place were all 100 fe switches.
That book is an excellent resource for performance issues that are difficult to spot.
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LEARN ABOUT CENTOS
libssh2_channel_direct_tcpip_ex
libssh2_channel_direct_tcpip_ex(3) libssh2 manual libssh2_channel_direct_tcpip_ex(3)
NAME
libssh2_channel_direct_tcpip_ex - Tunnel a TCP connection through an SSH session
SYNOPSIS
#include <libssh2.h>
LIBSSH2_CHANNEL * libssh2_channel_direct_tcpip_ex(LIBSSH2_SESSION *session, const char *host, int port, const char *shost, int sport);
LIBSSH2_CHANNEL * libssh2_channel_direct_tcpip(LIBSSH2_SESSION *session, const char *host, int port);
DESCRIPTION
session - Session instance as returned by libssh2_session_init_ex(3)
host - Third party host to connect to using the SSH host as a proxy.
port - Port on third party host to connect to.
shost - Host to tell the SSH server the connection originated on.
sport - Port to tell the SSH server the connection originated from.
Tunnel a TCP/IP connection through the SSH transport via the remote host to a third party. Communication from the client to the SSH server
remains encrypted, communication from the server to the 3rd party host travels in cleartext.
RETURN VALUE
Pointer to a newly allocated LIBSSH2_CHANNEL instance, or NULL on errors.
ERRORS
LIBSSH2_ERROR_ALLOC - An internal memory allocation call failed.
SEE ALSO
libssh2_session_init_ex(3)
libssh2 0.15 1 Jun 2007 libssh2_channel_direct_tcpip_ex(3)