From: beto@plan9.cs.su.oz.au beto@plan9.cs.su.oz.au
Subject: Panel + forks + postnote
Date: Fri, 13 Oct 1995 15:29:23 -0400 [thread overview]
Message-ID: <19951013192923.p310uFZ5Wv6r5NeNLXsasWYGcHvN0SJTna11eb1iiLI@z> (raw)
Hi,
I'm writing a program which uses the Panel library,
starts new processes based on mouse actions and
after a while kills those processes, but the interface
should not died. Is this possible? Has any one tried?
Mothra uses it, put only kills subprocesses in fatal
conditions, which do not require the Panel to keep
working.
I'm having problems after killing processes with
the panel library. It looks like there is some kind of
sincronization program, I'm not quite sure what's going on.
The error is
bitblt: bad slave 32 on event pipe: fd out of
range or not open
Here is an small program with I hope will
reproduce the problem.
Any help would be appreciated.
thanks
beto
#include <u.h>
#include <libc.h>
#include <libg.h>
#include <panel.h>
Panel *root;
void playnetwork(void);
void killall(void);
void restart(Panel *p, int buttons){
USED(p, buttons);
killall();
playnetwork();
}
/*
* To see the problem just press
* retstart
*/
void main(void){
rfork(RFNOTEG|RFNAMEG);
binit(0, 0, 0);
einit(Emouse);
plinit(screen.ldepth);
root=plframe(0, 0);
pllabel(root, 0, "Playing.....");
plbutton(root, 0, "restart", restart);
ereshaped(screen.r);
playnetwork();
for(;;) plmouse(root, emouse());
}
void ereshaped(Rectangle r){
screen.r=r;
plpack(root, r);
bitblt(&screen, r.min, &screen, r, Zero);
pldraw(root, &screen);
}
/* from mothra.c */
void filter(char *cmd, int fd, int teefd){
char cmdbuf[512];
if(teefd!=-1) sprint(cmdbuf, "tee -a /fd/%d | %s", teefd, cmd);
else strcpy(cmdbuf, cmd);
bflush();
switch(rfork(RFFDG|RFPROC|RFNOWAIT)){
case -1:
break;
case 0:
/*close(0);
bclose();
dup(fd, 0);
close(fd);/**/
execl("/bin/rc", "rc", "-c", cmdbuf, 0);
_exits(0);
default:
break;
}
close(teefd);
close(fd);
}
void
playnetwork(void)
{
filter("sleep 1000", 0,-1);
}
void
killall(void)
{
postnote(PNGROUP, getpid(), "kill\n");
}
next reply other threads:[~1995-10-13 19:29 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
1995-10-13 19:29 beto [this message]
-- strict thread matches above, loose matches on Subject: below --
1995-10-16 22:31 beto
1995-10-13 13:27 td
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