Re: [LI] Signal behaves differently on LINUX and HPUX

[Rajshekar Iyer <rshekar@xxxxxxxxxxxx>]

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comp.sys.hp.hpux
ucb.cs.hpux
ucb.cs.hpux.users

HTH
rshekar


Ghins Mathai wrote:

> May be you are right. But I would like a definitive answer. Is there any
> HP-UX mailing list ???
>
> On Thu, 14 Oct 1999, Guruprasad, Mahendrakar  V (IE10) wrote:
>
> > This may be because , In linux scanf is implemented as atomic operation & in
> > HPUX, it may not have been implemented
> > as atomic operaration. Hope you understand what I mean by atomic ( If
> > execute one , then execute all)
> >
> > Bye
> >
> > > -----Original Message-----
> > > From:       Ghins Mathai [SMTP:ghins@xxxxxxxxxxxxxxx]
> > > Sent:       Thursday, October 14, 1999 11:24 AM
> > > To: linux-india@xxxxxxxxxxxxxxxxxxxxx
> > > Subject:    [LI] Signal behaves differently on LINUX and HPUX
> > >
> > > Hi,
> > >   SIGALRM  interrupts  the system calls in HPUX even when
> > >   signal handler is present.
> > >   When the signal is sent, the signal handler is called but the blocking
> > >
> > >    system calls like "accept" are interrupted.
> > >
> > >    Can somebody tell why does this happen on HPUX and
> > >     how to solve it?
> > > regards
> > > -------
> > >
> > > PS: Following is the code when run on HPUX "scanf" is  interrupted. On
> > > Linux "scanf" will wait till user presses any key.
> > > { Looks like commercial unices can't match Linux ;-)   }
> > > -------
> > > #include <stdio.h>
> > > #include <signal.h>
> > >
> > > void signal_handler(int i)
> > > {
> > >   printf("received sig alarm\n");
> > >   signal(SIGALRM,signal_handler);
> > >   alarm(10);
> > >   return;
> > > }
> > > void main(void)
> > > {
> > >   int value;
> > >   alarm(5);
> > >   signal(SIGALRM,signal_handler);
> > >
> > >   printf("Enter the value : \n");
> > >   scanf("%d",&value);
> > >   printf("The read value is %d\n",value);
> > > }
> > > ---------
> > >
> > >
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