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/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1982-2010 AT&T Intellectual Property *
* and is licensed under the *
* Common Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* http://www.opensource.org/licenses/cpl1.0.txt *
* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) *
* *
* Information and Software Systems Research *
* AT&T Research *
* Florham Park NJ *
* *
* David Korn <dgk@research.att.com> *
* *
***********************************************************************/
#pragma prototyped
/*
* alarm [-r] [varname [+]when]
*
* David Korn
* AT&T Labs
*
*/
#include "defs.h"
#include <error.h>
#include <stak.h>
#include "builtins.h"
#include "FEATURE/time"
#define R_FLAG 1
#define L_FLAG 2
struct tevent
{
Namfun_t fun;
Namval_t *node;
Namval_t *action;
struct tevent *next;
long milli;
int flags;
void *timeout;
Shell_t *sh;
};
static const char ALARM[] = "alarm";
static void trap_timeout(void*);
/*
* insert timeout item on current given list in sorted order
*/
static void *time_add(struct tevent *item, void *list)
{
register struct tevent *tp = (struct tevent*)list;
if(!tp || item->milli < tp->milli)
{
item->next = tp;
list = (void*)item;
}
else
{
while(tp->next && item->milli > tp->next->milli)
tp = tp->next;
item->next = tp->next;
tp->next = item;
}
tp = item;
tp->timeout = (void*)sh_timeradd(tp->milli,tp->flags&R_FLAG,trap_timeout,(void*)tp);
return(list);
}
/*
* delete timeout item from current given list, delete timer
*/
static void *time_delete(register struct tevent *item, void *list)
{
register struct tevent *tp = (struct tevent*)list;
if(item==tp)
list = (void*)tp->next;
else
{
while(tp && tp->next != item)
tp = tp->next;
if(tp)
tp->next = item->next;
}
if(item->timeout)
timerdel((void*)item->timeout);
return(list);
}
static void print_alarms(void *list)
{
register struct tevent *tp = (struct tevent*)list;
while(tp)
{
if(tp->timeout)
{
register char *name = nv_name(tp->node);
if(tp->flags&R_FLAG)
{
double d = tp->milli;
sfprintf(sfstdout,e_alrm1,name,d/1000.);
}
else
sfprintf(sfstdout,e_alrm2,name,nv_getnum(tp->node));
}
tp = tp->next;
}
}
static void trap_timeout(void* handle)
{
register struct tevent *tp = (struct tevent*)handle;
tp->sh->trapnote |= SH_SIGALRM;
if(!(tp->flags&R_FLAG))
tp->timeout = 0;
tp->flags |= L_FLAG;
tp->sh->sigflag[SIGALRM] |= SH_SIGALRM;
if(sh_isstate(SH_TTYWAIT))
sh_timetraps();
}
void sh_timetraps(void)
{
register struct tevent *tp, *tpnext;
register struct tevent *tptop;
while(1)
{
sh.sigflag[SIGALRM] &= ~SH_SIGALRM;
tptop= (struct tevent*)sh.st.timetrap;
for(tp=tptop;tp;tp=tpnext)
{
tpnext = tp->next;
if(tp->flags&L_FLAG)
{
tp->flags &= ~L_FLAG;
if(tp->action)
sh_fun(tp->action,tp->node,(char**)0);
tp->flags &= ~L_FLAG;
if(!tp->flags)
{
nv_unset(tp->node);
nv_close(tp->node);
}
}
}
if(!(sh.sigflag[SIGALRM]&SH_SIGALRM))
break;
}
}
/*
* This trap function catches "alarm" actions only
*/
static char *setdisc(Namval_t *np, const char *event, Namval_t* action, Namfun_t
*fp)
{
register struct tevent *tp = (struct tevent*)fp;
if(!event)
return(action?"":(char*)ALARM);
if(strcmp(event,ALARM)!=0)
{
/* try the next level */
return(nv_setdisc(np, event, action, fp));
}
if(action==np)
action = tp->action;
else
tp->action = action;
return(action?(char*)action:"");
}
/*
* catch assignments and set alarm traps
*/
static void putval(Namval_t* np, const char* val, int flag, Namfun_t* fp)
{
register struct tevent *tp;
register double d;
if(val)
{
double now;
#ifdef timeofday
struct timeval tmp;
timeofday(&tmp);
now = tmp.tv_sec + 1.e-6*tmp.tv_usec;
#else
now = (double)time(NIL(time_t*));
#endif /* timeofday */
nv_putv(np,val,flag,fp);
d = nv_getnum(np);
tp = (struct tevent*)fp;
if(*val=='+')
{
double x = d + now;
nv_putv(np,(char*)&x,NV_INTEGER,fp);
}
else
d -= now;
tp->milli = 1000*(d+.0005);
if(tp->timeout)
sh.st.timetrap = time_delete(tp,sh.st.timetrap);
if(tp->milli > 0)
sh.st.timetrap = time_add(tp,sh.st.timetrap);
}
else
{
tp = (struct tevent*)nv_stack(np, (Namfun_t*)0);
sh.st.timetrap = time_delete(tp,sh.st.timetrap);
if(tp->action)
nv_close(tp->action);
nv_unset(np);
free((void*)fp);
}
}
static const Namdisc_t alarmdisc =
{
sizeof(struct tevent),
putval,
0,
0,
setdisc,
};
int b_alarm(int argc,char *argv[],void *extra)
{
register int n,rflag=0;
register Namval_t *np;
register struct tevent *tp;
register Shell_t *shp = ((Shbltin_t*)extra)->shp;
while (n = optget(argv, sh_optalarm)) switch (n)
{
case 'r':
rflag = R_FLAG;
break;
case ':':
errormsg(SH_DICT,2, "%s", opt_info.arg);
break;
case '?':
errormsg(SH_DICT,ERROR_usage(2), "%s", opt_info.arg);
break;
}
argc -= opt_info.index;
argv += opt_info.index;
if(error_info.errors)
errormsg(SH_DICT,ERROR_usage(2),optusage((char*)0));
if(argc==0)
{
print_alarms(shp->st.timetrap);
return(0);
}
if(argc!=2)
errormsg(SH_DICT,ERROR_usage(2),optusage((char*)0));
np = nv_open(argv[0],shp->var_tree,NV_NOARRAY|NV_VARNAME|NV_NOASSIGN);
if(!nv_isnull(np))
nv_unset(np);
nv_setattr(np, NV_DOUBLE);
if(!(tp = newof(NIL(struct tevent*),struct tevent,1,0)))
errormsg(SH_DICT,ERROR_exit(1),e_nospace);
tp->fun.disc = &alarmdisc;
tp->flags = rflag;
tp->node = np;
tp->sh = shp;
nv_stack(np,(Namfun_t*)tp);
nv_putval(np, argv[1], 0);
return(0);
}
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