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net/inet/inet_close.c: Extend some comments.

This commit is contained in:
Gregory Nutt 2019-07-01 08:24:39 -06:00
parent 5e36627366
commit b0f751897c
1 changed files with 18 additions and 0 deletions
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18
net/inet/inet_close.c
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@ -402,6 +402,24 @@ static inline int tcp_close_disconnect(FAR struct socket *psock)
#ifdef CONFIG_NET_SOLINGER #ifdef CONFIG_NET_SOLINGER
/* A non-NULL value of the priv field means that lingering is /* A non-NULL value of the priv field means that lingering is
* enabled. * enabled.
*
* REVISIT: SO_LINGER is not really implemented. Per OpenGroup.org:
*
* SO_LINGER
* Lingers on a close() if data is present. This option
* controls the action taken when unsent messages queue
* on a socket and close() is performed. If SO_LINGER
* is set, the system shall block the calling thread
* during close() until it can transmit the data or
* until the time expires. If SO_LINGER is not specified,
* and close() is issued, the system handles the call
* in a way that allows the calling thread to continue
* as quickly as possible. This option takes a linger
* structure, as defined in the <sys/socket.h> header,
* to specify the state of the option and linger interval.
*
* Here is merely adds a pointless timeout on top of the normal
* close operation.
*/ */
linger = _SO_GETOPT(psock->s_options, SO_LINGER); linger = _SO_GETOPT(psock->s_options, SO_LINGER);