Writing channel-exit programs on UNIX, Linux, and Windows

We can use the following information to help you write channel-exit programs for UNIX, Linux, and Windows systems.

Follow the instructions outlined in Writing exits and installable services on UNIX, Linux and Windows. Use the following channel exit specific information, where appropriate:

The exit must be written in C, and is a DLL on Windows.

Define a dummy MQStart() routine in the exit and specify MQStart as the entry point in the library. Figure 1 shows how to set up an entry to your program:

#include <cmqec.h>

void MQStart() {;} /* dummy entry point - for consistency only */
void MQENTRY ChannelExit ( PMQCXP  pChannelExitParms,
                           PMQCD   pChannelDefinition,
                           PMQLONG pDataLength,
                           PMQLONG pAgentBufferLength,
                           PMQVOID pAgentBuffer,
                           PMQLONG pExitBufferLength,
                           PMQPTR  pExitBufferAddr)
{
... Insert code here
}

When writing channel exits for Windows using Visual C++, we must write your own DEF file. An example of how is shown in Figure 2. For further information on writing channel exit programs, see Writing channel-exit programs.

EXPORTS
ChannelExit

Parent topic: Writing channel-exit programs

Related concepts

• Writing channel exit programs on IBM i
• Writing channel exit programs on z/OS