I've read the replies so far. What you have written as proposed code is simply nonsense. doesn't make sense to me. Please explain in words what it is that you are trying to accomplish?

You cannot "go to" a function x(), because there would be no way to return from the function. Part of a statement like: func_x(); is setting up the stack to call func_x() so that when func_x finishes, it returns to the caller. A "go to" would skip all that stuff that enables the function to return to the caller.

Describe in words what you are trying to do.

Update: this code example, while correct is not illustrative of the OP's problem.

sysread() would be used for say reading a socket with fixed size user level packets. When we read the socket, we learn how many bytes were actually read and we loop if we need more. "Go to sysread() makes no sense".

sub readn   #returns scalar with <= $bytes requested
{
    my ($socket, $bytes ) = @_;
    my $offset = 0;
   
    my $buf = "";
    my $nread = -1;
   
    while ($offset < $bytes and $nread) # $nread==0 means EOF
    { 
       my $nleft = $bytes-$offset;     
       $nread = sysread($socket, $buf, $nleft, $offset);
       $offset += $nread;    
    }
   
    return $buf;
}

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In reply to Re: how to goto &sysread ? by Marshall
in thread how to goto &sysread ? by perl5ever

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