If the fork fails, $pid is undef, but will still compare true to 0. Second, if it fails, the error is in $!, not $pid.
Good catch! You are correct. My bad.
Instead of
die "fork returned $pid";
I should have invoked
die $!;
as I have in code that I have written in the past
where I have done forking.
Too much C-code lately the if-tree is a C-ism. As in
pid = fork();
switch (pid){
-1: perror("Fork failed");
exit(-1);
0: /* Child */
break;
default:
/* parent */
break;
}
anyway, good catch.
All all this code is off the top of my head.
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