Re: Counting elements returned from expression

You almost have it. What you are missing is that the list assignment operator is in scalar context and is returning the count, not the list being assigned to. Infix operators obscure things sometimes. It is easier to understand if we rewrite it as if list assignment was a function call instead

Re: Re-exec in perl

On Tue, Oct 4, 2016 at 2:07 PM, X Dungeness wrote: > Here's a possibly relevant note in the docs for both "alarm" and > "sleep": > > It is usually a mistake to intermix "alarm" and "sleep" calls, > because "sleep" may be internally implemented on your system > with

Re: Counting elements returned from expression

To summarize There is a list assignment and the difference between assigning to an empty list and an non empty list is the container(s) inside the liste that capture the different values (scalars or lists or hashes) for example () ans ($a, @b, %c... ) when we assign to an ampty list the values

Re: Re-exec in perl

Here's a possibly relevant note in the docs for both "alarm" and "sleep": It is usually a mistake to intermix "alarm" and "sleep" calls, because "sleep" may be internally implemented on your system with "alarm". On Tue, Oct 4, 2016 at 1:34 PM, Chas. Owens

Re: Re-exec in perl

The first alarm is in a different process (same PID different process) due to the exec. I am not sure what is happening, but in general it is never a good idea to do anything complex in a signal handler. On Tue, Oct 4, 2016 at 4:21 PM Shawn H Corey wrote: > On Tue, 04 Oct

Re: Re-exec in perl

On Tue, 04 Oct 2016 19:32:44 + "Chas. Owens" wrote: > It looks like the problem exists at the C level as well. This code > doesn't work past the first alarm: Doesn't it say the alarm has to be reset by the code in the documentation? After all, you don't want a second

Re: Re-exec in perl

It looks like the problem exists at the C level as well. This code doesn't work past the first alarm: #include #include #include #include #include int n; char s[10]; char* prog; int alarm_called = 0; void handle_alrm(int signo) { if (signo == SIGALRM) { execv(prog, (char*[]) { prog, s,

Re: Re-exec in perl

First, never use -w flag to enable warnings; use the warnings pragma instead. Second, you should not exec the script directly, you don't know if it is executable or not, and it could even wind up running under a different version of perl. Instead, you should exec same the interpreter that is

Re: Counting elements returned from expression

On Mon, Oct 3, 2016 at 10:45 PM Lawrence Statton wrote: snip > the =()= "operator" just does that without creating a temporary variable snip Almost, but not quite. You can see the difference when =()= is in list context: my @a = (my @temp) = get_clown_hat; my @b = () =