Experimental Physics and
Industrial Control System

Jeff Hill <[email protected]> · Thu, 17 Jul 1997 15:40:23 -0600

Firmin,

You need to call "ca_task_initialize()" prior to calling
"ca_add_fd_registration()". The attached modification of
your source works correctly. Most of the CA functions
will call "ca_task_initialize()" for you if you forget to
take care of it, but this one does not. I will make this
one consistent with the others in EPICS 3.13.

Jeff

#include <stdio.h>

#include "cadef.h"

void FdRegHandler(void *, int, int);

int main()
{
	int CaStatus;
	int vparm;

	CaStatus = ca_task_initialize();
	SEVCHK(CaStatus,"ca init failed");

	CaStatus = ca_add_fd_registration(FdRegHandler,&vparm);

	return 0;
}

void FdRegHandler(void *vparm, int fd, int cond)
{
   printf("In FdRegHandler\n");
}

On Thursday, July 17, 1997 2:19 PM, Firmin Oliveira 
[SMTP:[email protected]] wrote:
> Hello,
>
> I have little to no EPICS channel access experience
>
> I have been trying to run my program with ca_add_fd_registration. It
> compiles/links okay, but when run it produces a segmentation fault upon
> entry into ca_add_fd_registration.  I have tried every combination of
> arguments I know into the routine but it continually gets a segmentation
> fault.  When the ca_add_fd_registration statement is commented out, the rest
> of the
> channel access routines work just fine (ca_task_initialize,
> ca_search_and_connect, ca_get, SEVCHK, ca_add_event.)  To be more specific
> about the problem:
>
>    include "cadef.h"
>    void FdRegHandler(void *, int, int);
>    ...
>
>    main()
>  {
>    int CaStatus;
>    my_struct vparm;
>    ...
>
>    CaStatus = ca_add_fd_registration(FdRegHandler,&vparm);
>    (Note: Segmentation fault occurs in above statement)
>    ...
>
> }
>
> void FdRegHandler(void *vparm, int fd, int cond)
> {
>    printf("In FdRegHandler\n");      (Note: this does not get printed)
> }
>
>
> Any help you can give would be appreciated.
>
> Aloha,
>
> Firmin Oliveira
>

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System