ZCOM C I/F Library Routines

ZMAPR (3X)

 

ZMAPR (3X)

NAME

zmapr – Set up ZLU mapping configuration

SYNOPSIS

#include

<zcom/zcomsys.h>

#include

<zcom/zcomcall.h> /* if compiled with ANSI C (recommended) */

int32 zmapr (zap, mzap)

zaddr_type *zap; zaddr_type *mzap;

DESCRIPTION Routine zmapr is used to set up an alternate mapping for a ZLU. After the zmapr routine has been successfully called, all messages addressed to the source ZLU (*zap) will be redirected to the destination ZLU (*mzap).

Both ZLUs must be an existing ZLU such as a:

-program ZLU returned from zopen,

-terminal ZLU pre-defined in the TTGEN configuration file,

-mapped ZLU used in previous zmapr calls.

The libraries libzcom_c.a and libpthread.a must be linked into the calling program by giving the options “-lzcom_c -lpthread” to cc(1) or ld(1).

Threads

This routine may be called from a multi-threaded application using the

Considerations

POSIX (1003.1c) kernel threads API package. This routine has the

 

following characteristics when called by a multi-threaded application:

 

cancellation point

Thread cancellation can occur when a thread

 

 

calls this routine.

 

async-cancel unsafe

The calling thread’s cancelability type must be

 

 

PTHREAD_CANCEL_DEFERRED if

 

 

cancellation is enabled.

 

async-signal unsafe

It cannot be called from a signal handler.

 

fork unsafe

It cannot be called by a child process after

 

 

fork(2) but before exec(2).

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Chapter 4