Bugs item #1588093, was opened at 2006-10-31 19:16
Message generated for change (Comment added) made by bagder
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Category: None
Group: None
Status: Open
Resolution: None
>Priority: 3
Private: No
Submitted By: Chris Nystrom (cnystrom)
>Assigned to: Daniel Stenberg (bagder)
Summary: libssh2_poll_channel_read()
Initial Comment:
I believe the following code demonstrates a bug with
the function libssh2_poll_channel_read(). This function
should return 1 when data is waiting to be read, but
always seems to return 0. In the program below I get a
return of zero, but I immediately and successfully read
data.
I need this function to work properly so I can write a
wrapper over libssh2 so I can use it in a
multi-threaded application.
Chris
--
#include "ssh2_lib.h"
#include <stdio.h>
#include "../sock_lib/sock_lib.h"
#define SSH_PORT (22)
int main(int argc, char *argv[])
{
int sock;
char buf[256] = "";
LIBSSH2_SESSION *session;
LIBSSH2_CHANNEL *channel;
const char *server = "apollo.newio.org";
const char *username = "cnystrom";
const char *passwd = "********";
sock = init_tcp_client(server, SSH_PORT);
if (sock <= 0) {
return (-1);
}
session = libssh2_session_init();
if (libssh2_session_startup(session, sock)) {
fprintf(stderr, "Failure establishing
SSH session\n");
return(-3);
}
if (libssh2_userauth_password(session, username,
passwd)) {
fprintf(stderr, "Authentication by
password failed.\n");
return (-4);
}
if (!(channel =
libssh2_channel_open_session(session))) {
fprintf(stderr, "Unable to open a
channel\n");
return (-5);
}
libssh2_channel_set_blocking(channel, BLOCK);
if (libssh2_channel_subsystem(channel, "hello")
!= 0) {
fprintf(stderr,
"error:
libssh2_channel_subsystem() failed.\n");
return (-6);
}
int i;
// bug: should return 1, but returns 0
i = libssh2_poll_channel_read(channel, 0);
printf("i = %d\n", i);
libssh2_channel_read(channel, buf, 256);
printf("--\n");
printf("%s", buf);
printf("--\n");
libssh2_channel_free(channel);
libssh2_session_disconnect(session, "Normal
Shutdown.");
libssh2_session_free(session);
close_socket(sock);
return 0;
}
----------------------------------------------------------------------
>Comment By: Daniel Stenberg (bagder)
Date: 2009-04-05 20:41
Message:
What exactly are you using/needing this function for? I don't see its
purpose. I would rather like to just deprecate it and not care about it
anymore...
----------------------------------------------------------------------
Comment By: James Housley (jehousley)
Date: 2007-06-06 22:21
Message:
Logged In: YES
user_id=32239
Originator: NO
Looking at the code, that is correct. The code loops looking at the same
packet over and over. There needs to be a call of some type to
libssh2_packet_read(), otherwise nothing will ever change in a single
threaded program.
----------------------------------------------------------------------
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