int medmCAInitialize()
{
int status;
/*
* add CA's fd to X
*/
status = ca_add_fd_registration(medmCAFdRegistrationCb,NULL);
if(status != ECA_NORMAL) return status;
status = ca_add_exception_event(medmCAExceptionHandlerCb, NULL);
if(status != ECA_NORMAL) return status;
status = caTaskInit();
return status;
}
int main(int argc, char** argv)
{
fd_set rfds;
int tot;
struct timeval tv;
if(argc!=3)
{
fprintf(stderr,"Usage: %s PV_to_monitor script_to_run\n\n",argv[0]);
fprintf(stderr,"This program monitored PV PV_to_monitor and\n");
fprintf(stderr,"runs and executes script_to_run, which can be\n");
fprintf(stderr,"any program or executable script.\n");
fprintf(stderr,"The script or program gets invoked with the first\n");
fprintf(stderr,"argument as the PV name and the second argument\n");
fprintf(stderr,"as the value of the PV\n");
fprintf(stderr,"The program or shell script script_to_run is\n");
fprintf(stderr,"run as a separate child process of this program\n");
fprintf(stderr,"This means that your script or program will not\n");
fprintf(stderr,"stop this process from running, if fact your\n");
fprintf(stderr,"script or program can be invoked many times if\n");
fprintf(stderr,"the value of the PV is changing rapidly and\n");
fprintf(stderr,"several instances of your program could be running\n");
fprintf(stderr,"simultaneously.\n");
return -1;
}
strcpy(pv_name,argv[1]);
script_name=argv[2];
pv_value[0]='\0';
if(access(script_name,X_OK)<0)
{
fprintf(stderr,"Script %s not found or not executable\n",script_name);
return -1;
}
signal(SIGINT,sig_func);
signal(SIGQUIT,sig_func);
signal(SIGTERM,sig_func);
signal(SIGHUP,sig_func);
signal(SIGCHLD,sig_chld);
FD_ZERO(&all_fds);
SEVCHK(ca_task_initialize(),"task initialize");
SEVCHK(ca_add_fd_registration(fdCB,&all_fds),"add fd registration");
SEVCHK(ca_add_exception_event(exCB,NULL),"add exception event");
SEVCHK(ca_search_and_connect(pv_name,&id,conCB,NULL),
"search and connect");
SEVCHK(ca_replace_access_rights_event(id,accCB),
"replace access rights event");
/* SEVCHK(ca_add_event(DBR_TIME_STRING,data.id,evCB,&data,&data.event),
"add event"); */
ca_pend_event(REALLY_SMALL);
/* fprintf(stderr,"Monitoring <%s>\n",pv_name); */
while(do_not_exit)
{
rfds=all_fds;
tv.tv_sec=1;
tv.tv_usec=0; /*200000*/;
switch(tot=select(FD_SETSIZE,&rfds,NULL,NULL,&tv))
{
/*
case -1:
perror("select error - bad");
break;
*/
case 0:
ca_pend_event(REALLY_SMALL);
break;
default:
/* fprintf(stderr,"select data ready\n"); */
ca_pend_event(REALLY_SMALL);
break;
}
}
fprintf(stderr,"PV monitor program is exiting!\n");
ca_task_exit();
return 0;
}
