Thanks for the info, looks good. I actually found some better a better example and wrote the code below, if your interested. (Note there will be a few changes once I compile, I'm almost absolutely sure on that). Now comes the big questions:
1. How can I get the program to startup when the linux kernel starts up(keep in mind it is only a does prompt, like unix)?
2. Where can I find a C compiler?
I know that at least one of them is probably easy, but my only excuse is that it has been a very long day.
Hi !
I had a verry simple question to ask...
In unix when we create pipes.. the unnamed pipes that is...
is there any way to access those pipes outside the code ?
Another thing.. do sockets have an entry in the inode table ?
TIA,
Devyani. (1 Reply)
Hai,
How cani declare socket and collect the data in a string varialbe.
Since i am new to this i am asking this.
Can we connect multiple port.
Thank you. (6 Replies)
Is there a way to see what sockets are in use? The developers here are getting some defunct processes and they would like to get a socket list.
This is on a Solaris 8 machine.
Thanks! (1 Reply)
Is it possible to trace the packages and the statuses of client's and/or server's sockets by the UNIX network administrative tools?
Two applications interact via sockets. There is no problem if they stay in the same network segment. If their hosts connected through the firewall then they aren't... (4 Replies)
anyone and teach me how to save standard output to a file in a client/server socket. I know how to read them to the screen but i'm not quite sure how to save them to a file.
my read to screen file code:
memset(line, 0x0, LINE_ARRAY_SIZE);
while (recv(connectSocket, line, MAX_MSG, 0) >... (1 Reply)
Hi,i now moved into a different section where i need to use sockets.
i am completely nill in sockets.
can some body please provide me what are the requirements for a socket.
to use sockets in c.
thanks (1 Reply)
if i have a server which wants to connect to exactly 5 clients, does that mean i need 5 socket file descriptors and use
listen(socket_fd,1);
for each one
or just do
listen(socket_fd,5)
also whats the second parameter number mean? what happens if i put 0 there?
also if i am connected... (28 Replies)
hai guys,
I'm doing a project in which one server communicates with several clients. How can i do it when i have different port numbers???:confused: (0 Replies)
Hi, i am student, think learning about c++, someone has a example the how establish a conection with sockets :b::b: (1 Reply)
Discussion started by: mmartinez
1 Replies
LEARN ABOUT REDHAT
connect
CONNECT(2) Linux Programmer's Manual CONNECT(2)NAME
connect - initiate a connection on a socket
SYNOPSIS
#include <sys/types.h>
#include <sys/socket.h>
int connect(int sockfd, const struct sockaddr *serv_addr, socklen_t addrlen);
DESCRIPTION
The file descriptor sockfd must refer to a socket. If the socket is of type SOCK_DGRAM then the serv_addr address is the address to which
datagrams are sent by default, and the only address from which datagrams are received. If the socket is of type SOCK_STREAM or SOCK_SEQ-
PACKET, this call attempts to make a connection to another socket. The other socket is specified by serv_addr, which is an address (of
length addrlen) in the communications space of the socket. Each communications space interprets the serv_addr parameter in its own way.
Generally, connection-based protocol sockets may successfully connect only once; connectionless protocol sockets may use connect multiple
times to change their association. Connectionless sockets may dissolve the association by connecting to an address with the sa_family mem-
ber of sockaddr set to AF_UNSPEC.
RETURN VALUE
If the connection or binding succeeds, zero is returned. On error, -1 is returned, and errno is set appropriately.
ERRORS
The following are general socket errors only. There may be other domain-specific error codes.
EBADF The file descriptor is not a valid index in the descriptor table.
EFAULT The socket structure address is outside the user's address space.
ENOTSOCK
The file descriptor is not associated with a socket.
EISCONN
The socket is already connected.
ECONNREFUSED
No one listening on the remote address.
ETIMEDOUT
Timeout while attempting connection. The server may be too busy to accept new connections. Note that for IP sockets the timeout may
be very long when syncookies are enabled on the server.
ENETUNREACH
Network is unreachable.
EADDRINUSE
Local address is already in use.
EINPROGRESS
The socket is non-blocking and the connection cannot be completed immediately. It is possible to select(2) or poll(2) for comple-
tion by selecting the socket for writing. After select indicates writability, use getsockopt(2) to read the SO_ERROR option at level
SOL_SOCKET to determine whether connect completed successfully (SO_ERROR is zero) or unsuccessfully (SO_ERROR is one of the usual
error codes listed here, explaining the reason for the failure).
EALREADY
The socket is non-blocking and a previous connection attempt has not yet been completed.
EAGAIN No more free local ports or insufficient entries in the routing cache. For PF_INET see the net.ipv4.ip_local_port_range sysctl in
ip(7) on how to increase the number of local ports.
EAFNOSUPPORT
The passed address didn't have the correct address family in its sa_family field.
EACCES, EPERM
The user tried to connect to a broadcast address without having the socket broadcast flag enabled or the connection request failed
because of a local firewall rule.
CONFORMING TO
SVr4, 4.4BSD (the connect function first appeared in BSD 4.2). SVr4 documents the additional general error codes EADDRNOTAVAIL, EINVAL,
EAFNOSUPPORT, EALREADY, EINTR, EPROTOTYPE, and ENOSR. It also documents many additional error conditions not described here.
NOTE
The third argument of connect is in reality an int (and this is what BSD 4.* and libc4 and libc5 have). Some POSIX confusion resulted in
the present socklen_t. The draft standard has not been adopted yet, but glibc2 already follows it and also has socklen_t. See also
accept(2).
BUGS
Unconnecting a socket by calling connect with a AF_UNSPEC address is not yet implemented.
SEE ALSO accept(2), bind(2), listen(2), socket(2), getsockname(2)Linux 2.2 1998-10-03 CONNECT(2)