I created stream socket, tries to connect to port 7 on the remote machine.
After doing the non blocking connect call I did select with time out value is 3 secs. I am always getting timed out though I am writing prior to select.
code:
My doubt is write on non blocking socket will happen or write fails and select will timeout. What do I have to do to connection successful
Moderator's Comments:
After more than 40 posts you should know how and when to apply code tags
---------- Post updated 09-05-10 at 01:11 PM ---------- Previous update was 09-04-10 at 11:56 PM ----------
I found wrong in my code. I should move my write to the else part and I should set read flags as NULL and write flags as my socket.
---------- Post updated at 01:15 PM ---------- Previous update was at 01:11 PM ----------
Hi everybody !
We have all flavors of Unix / Linux and we want to restrict ftp users to telnet our servers.
We can't disable telnet because we have other users using it.
:confused: Are there any thing that could be done to solve this thing ???
Best regards,
Julio Moreira (11 Replies)
I've got a legit DHCP server on my network. I've got a 3550 as my VTP server providing 4 vlans to 4 2950 switches. If somebody were to plug into one of those vlans with a DHCP server configured then it would throw off my whole network. How could i block the DHCP server that could plug into the... (2 Replies)
Hello,
When using a non-blocking connect, is it _guaranteed_ that connection completion can be detected by selecting for writeability?
I have encountered situations where the socket has returned both readable and writeable at the same time - having trawled the net, I have seen some old posts... (1 Reply)
Hi Folks
I have been debugging a script that is called every thirty seconds. Basically it is doing a ps, well two actually, one to file (read by the getline below) and the other into a pipe. The one into the pipe is: -
V_SYSVPS=/usr/sysv/bin/ps
$V_SYSVPS -p$PIDLIST -o$PSARGS... (0 Replies)
We have a production server at a client site running AIX. And recently when users are trying to connect to it via telnet, it prompts "No more multiple IP addresses to connect".
Can I know what does this error mean? and how to rectify this?
Thanks. (2 Replies)
will there be any unexpected results on looping connect call for a non blocking socket to determine the connection based on error code. I am getting connection unsuccessful intermittently and so wondering whether is the timeout 500 millisec not sufficient or looping connect cause any unexpected.
... (7 Replies)
It appears i cant connect linux VPS server via SSH or i cant SCP any file to it and i cant wget any file TO it (from inside it) while CSF (Config Server Firewall, LFD is running. Just after isntall in default configuration and after changing TESTING mode to LIVE mode.
Trying to wget & install... (1 Reply)
among the below socket programming api's, please let me know which are blocking and non-blocking.
socket
accept
bind
listen
write
read
close (2 Replies)
Greetings Experts,
I am working for a bank client and have a question on connect-direct and SFTP.
We are using Linux RedHat servers. We use connect-direct to transfer (NDM) files from one server to another server. At times, we manually transfer the files using SFTP from one server to another... (2 Replies)
Discussion started by: chill3chee
2 Replies
LEARN ABOUT NETBSD
connect
CONNECT(2) BSD System Calls Manual CONNECT(2)NAME
connect -- initiate a connection on a socket
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <sys/socket.h>
int
connect(int s, const struct sockaddr *name, socklen_t namelen);
DESCRIPTION
The parameter s is a socket. If it is of type SOCK_DGRAM, this call specifies the peer with which the socket is to be associated; this
address is that to which datagrams are to be sent, and the only address from which datagrams are to be received. If the socket is of type
SOCK_STREAM, this call attempts to make a connection to another socket. The other socket is specified by name, which is an address in the
communications space of the socket. namelen indicates the amount of space pointed to by name, in bytes. Each communications space inter-
prets the name parameter in its own way. Generally, stream sockets may successfully connect() only once; datagram sockets may use connect()
multiple times to change their association. Datagram sockets may dissolve the association by connecting to an invalid address, such as a
null address.
If a connect() call is interrupted by a signal, it will return with errno set to EINTR and the connection attempt will proceed as if the
socket was non-blocking. Subsequent calls to connect() will set errno to EALREADY.
RETURN VALUES
If the connection or binding succeeds, 0 is returned. Otherwise a -1 is returned, and a more specific error code is stored in errno.
ERRORS
The connect() call fails if:
[EBADF] s is not a valid descriptor.
[ENOTSOCK] s is a descriptor for a file, not a socket.
[EADDRNOTAVAIL] The specified address is not available on this machine.
[EAFNOSUPPORT] Addresses in the specified address family cannot be used with this socket.
[EISCONN] The socket is already connected.
[ETIMEDOUT] Connection establishment timed out without establishing a connection.
[ECONNREFUSED] The attempt to connect was forcefully rejected.
[ENETUNREACH] The network isn't reachable from this host.
[EADDRINUSE] The address is already in use.
[EFAULT] The name parameter specifies an area outside the process address space.
[EINPROGRESS] The socket is non-blocking and the connection cannot be completed immediately. It is possible to select(2) or poll(2) for
completion by selecting or polling the socket for writing. The success or failure of the connect operation may be deter-
mined by using getsockopt(2) to read the socket error status with the SO_ERROR option at the SOL_SOCKET level. The
returned socket error status is zero on success, or one of the error codes listed here on failure.
[EALREADY] Either the socket is non-blocking mode or a previous call to connect() was interrupted by a signal, and the connection
attempt has not yet been completed.
[EINTR] The connection attempt was interrupted by a signal.
The following errors are specific to connecting names in the UNIX domain. These errors may not apply in future versions of the UNIX IPC
domain.
[ENOTDIR] A component of the path prefix is not a directory.
[ENAMETOOLONG] A component of a pathname exceeded {NAME_MAX} characters, or an entire path name exceeded {PATH_MAX} characters.
[ENOENT] The named socket does not exist.
[EACCES] Search permission is denied for a component of the path prefix, or write access to the named socket is denied.
[ELOOP] Too many symbolic links were encountered in translating the pathname.
SEE ALSO accept(2), getsockname(2), getsockopt(2), poll(2), select(2), socket(2)HISTORY
The connect() function call appeared in 4.2BSD.
BSD May 18, 2004 BSD