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From: aoki@cs.berkeley.edu (Paul M. Aoki)
To: postgres@postgres.Berkeley.EDU
Cc: Norbik.B.Idris@cm.cf.ac.uk
Reply-To: aoki@cs.berkeley.edu (Paul M. Aoki)
Subject: [Norbik.B.Idris@cm.cf.ac.uk: C functions]
Date: Thu, 25 Aug 94 11:51:26 -0700
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------- Forwarded Message

 From:  N B Idris <Norbik.B.Idris@cm.cf.ac.uk>
 To:  postman@postgres.Berkeley.EDU
 Cc:  Norbik.B.Idris@cm.cf.ac.uk
 Subject:  C functions
 Date:  Thu, 25 Aug 94 19:50:18 BST

 In writing a user defined C function which is callable via a define function command,
 can we have within the C function :
  
 	a) Basic I/O functions such as scanf/printf?
 
 	b) System calls eg. system("shelltool routine2");
 	   where parameter "routine2" is another executable program to be invoked
 	   within the new shelltool called?
 
 I wrote such a C function which does not cause any problem to postgres, i.e. all
 db retrievel etc. are working alright.  However, all statements of the form (a) 
 and (b) above, which exist in the routine seem to be (happily) ignored by postgres.
 
 I am working on version 4.1 using Sunsparc IPX.
 
 My define command is :
 ---------------------
 	define function just_compute
 		(language = "c", returntype = int4)
 		arg is (int4,int4,int4)
 		as "/home/thrall2/scmnbi/C-PROGRAMS/compute.o" \g
 
 and my compute.c program:
 ------------------------
 
 	#include <stdio.h>
 
 		long int 	a, z, n;
 
 
 	int just_compute(a,z,n)
 	{
 		long int	x;
 
 		x= a + z + n;
 		printf("x here = %d\n",x);   <-----SEEMED IGNORED!
 		 
 		simple_system_call();
 		return(x);
 
 	}
 
 	simple_system_call()
 	{
 		int	j, t=3;	
 
 	  	for (j=1; j<=t; j++)
 		    {
 			system("shelltool routine2"); 	   <----- IGNORED!
 			/*routine2 is another xcutable */
 		    };
 	}
 
 and I used it as:
 ----------------
 
 * retrieve (employee.all) where get_shares(30,40,50) < employee.empno \g
 
 Query sent to backend is "retrieve (employee.all) where get_shares(30,40,50) < employee.empno "
 -----------------------------------------------------------------------
 | address     | empno       | ssno        | name        | project_done|
 -----------------------------------------------------------------------
 | birmingham  | 2000        | 3003        | brown       | Nato 5      |
 -----------------------------------------------------------------------
 | wolverhampton| 2001        | 3004        | carnduff    | Nato 6      |
 -----------------------------------------------------------------------
 | worcester   | 2002        | 3005        | jones       | Nato 7      |
 -----------------------------------------------------------------------
 
 Go 
 
 This retrievel is OK, but....
 THE MAIN QUESTION : What happens to those ignored statements?
 
 Thanks in anticipation.
 
 norbik.
 
   

------- End of Forwarded Message
--
  Paul M. Aoki          |  University of California at Berkeley
  aoki@CS.Berkeley.EDU  |  Dept. of EECS, Computer Science Division (#1776) 
                        |  Berkeley, CA 94720-1776

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