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VSTa manual pages  - MSG_ERR (2)

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msg_err - send back an error

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Synopsis
Description

#include <sys/msg.h>
int msg_err(long sender, char *errstring);

msg_err() is used to return an error from a server to a client. Most commonly, it is used to reply with error to a request received via msg_receive(). The client sees his msg_send() return a -1, and can access the errstring by calling strerror().

The client’s connection remains functional, and a new request can be sent via a new msg_send() call.