NAME
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NAME
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listen - listen for connections on a socket
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listen - listen for connections on a socket
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SYNOPSIS
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SYNOPSIS
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#include <network.h>
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#include <network.h>
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int listen(int s, int backlog);
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int listen(int s, int backlog);
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DESCRIPTION
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DESCRIPTION
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To accept connections, a socket is first created with
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To accept connections, a socket is first created with
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socket(2), a willingness to accept incoming connections
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socket(2), a willingness to accept incoming connections
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and a queue limit for incoming connections are specified
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and a queue limit for incoming connections are specified
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with listen, and then the connections are accepted with
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with listen, and then the connections are accepted with
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accept(2). The listen call applies only to sockets of
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accept(2). The listen call applies only to sockets of
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type SOCK_STREAM or SOCK_SEQPACKET.
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type SOCK_STREAM or SOCK_SEQPACKET.
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The backlog parameter defines the maximum length the queue
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The backlog parameter defines the maximum length the queue
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of pending connections may grow to. If a connection
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of pending connections may grow to. If a connection
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request arrives with the queue full the client may receive
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request arrives with the queue full the client may receive
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an error with an indication of ECONNREFUSED or, if the
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an error with an indication of ECONNREFUSED or, if the
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underlying protocol supports retransmission, the request
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underlying protocol supports retransmission, the request
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may be ignored so that retries may succeed.
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may be ignored so that retries may succeed.
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RETURN VALUE
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RETURN VALUE
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On success, zero is returned. On error, -1 is returned,
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On success, zero is returned. On error, -1 is returned,
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and errno is set appropriately.
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and errno is set appropriately.
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ERRORS
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ERRORS
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EBADF The argument s is not a valid descriptor.
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EBADF The argument s is not a valid descriptor.
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ENOTSOCK
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ENOTSOCK
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The argument s is not a socket.
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The argument s is not a socket.
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EOPNOTSUPP
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EOPNOTSUPP
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The socket is not of a type that supports the lis-
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The socket is not of a type that supports the lis-
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ten operation.
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ten operation.
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