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NNG_CLOSE(3) NNG Reference Manual NNG_CLOSE(3)

NAME

nng_close - close socket

SYNOPSIS

#include <nng/nng.h>
int nng_close(nng_socket s);

DESCRIPTION

The nng_close() function closes the supplied socket, s. Messages that have been submitted for sending may be flushed or delivered, depending upon the transport.

Further attempts to use the socket after this call returns will result in NNG_ECLOSED. Threads waiting for operations on the socket when this call is executed may also return with an NNG_ECLOSED result.


Note

Closing the socket while data is in transmission will likely lead to loss
of that data. There is no automatic linger or flush to ensure that the socket send buffers have completely transmitted. It is recommended to wait a brief period after calling nng_send() or similar functions, before calling this function.

RETURN VALUES

This function returns 0 on success, and non-zero otherwise.

ERRORS

NNG_ECLOSED

The socket s is already closed or was never opened.

SEE ALSO

nng_strerror(3), nng_options(5), nng_socket(5), nng(7)

2024-10-11