PRLinger

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Structure used with the PR_SockOpt_Linger socket option to specify the time interval (in PRIntervalTime units) to linger on closing a socket if any data remain in the socket send buffer.

Syntax

#include <prio.h>
typedef struct PRLinger {
  PRBool polarity;
  PRIntervalTime linger;
} PRLinger;

Fields

The structure has the following fields:

polarity

Polarity of the option's setting: PR_FALSE means the option is off, in which case the value of linger is ignored. PR_TRUE means the option is on, and the value of linger will be used to determine how long PR_Close waits before returning.

linger

Time (in PRIntervalTime units) to linger before closing if any data remain in the socket send buffer.

Description

By default, PR_Close returns immediately, but if there are any data remaining in the socket send buffer, the system attempts to deliver the data to the peer. The PR_SockOpt_Linger socket option, with a value represented by a structure of type PRLinger, makes it possible to change this default as follows:

• If polarity is set to PR_FALSE, PR_Close returns immediately, but if there are any data remaining in the socket send buffer, the runtime attempts to deliver the data to the peer.
• If polarity is set to PR_TRUE and linger is set to 0 (PR_INTERVAL_NO_WAIT), the runtime aborts the connection when it is closed and discards any data remaining in the socket send buffer.
• If polarity is set to PR_TRUE and linger is nonzero, the runtime lingers when the socket is closed. That is, if any data remains in the socket send buffer, PR_Close blocks until either all the data is sent and acknowledged by the peer or the interval specified by linger expires.