sttransaction(3)					    ShapeTools Toolkit Library						  sttransaction(3)

NAME

       stAbortThis, stThisTransaction - simple transaction handling

SYNOPSIS

       #include <config.h>
       #include <sttk.h>

       void	    stAbortThis (int domsg);

       struct stTransactionstThisTransaction;

DESCRIPTION

       stAbortThis is part of a simple transaction mechanism on the basis of setjmp(3) and longjmp(3). A transacion is started by setting a return
       point calling setjmp(3) and may be aborted by calling stAbortThis. This outputs a short abort message, cleans up the temporary files (stRm-
       RegisteredFiles(3)) and performs a longjmp(3) operation, returning to the transaction start point.

       The structure variable stThisTransaction carries information about the current transaction. It has the following fields:
       struct stTransaction {
	 char tr_fname[MAXPATHLEN+1];
	 int tr_done;
	 int tr_seqno;
	 int tr_rc;
	 jmp_buf tr_env;
       };

       When  setting  the  transaction return point by calling setjmp(3) the tr_env field must be used as argument to setjmp. The name of the con-
       cerned file should be stored in tr_fname field and the tr_done flag should be cleared.  tr_seqno is the serial number of the current trans-
       action  and must be increased at the beginning of each new transaction. The tr_rc return code can be set to an appropriate return code when
       something went wrong and the transaction was aborted.  When not set by the application, tr_rc will be set nun null by stAbortThis on  abor-
       tion of the transaction. On successful completion, tr_done should be set TRUE.

SEE ALSO

       stRmRegisteredFiles(3), setjmp(3), longjmp(3).

sttk-1.7						     Thu Jun 24 17:43:37 1993						  sttransaction(3)