gnu/usr.bin/perl/t/op/waitpid.t


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39

#!./perl

# tests for (possibly emulated) waitpid

BEGIN {
    chdir 't' if -d 't';
    @INC = '../lib';
    require './test.pl';
    require Config;
    skip_all('no Errno')
	unless eval 'use Errno qw(EINVAL); 1';
    skip_all('no POSIX')
        unless eval 'use POSIX qw(WNOHANG); 1';
}

$|=1;

watchdog(10);
{
    # [perl #85228] Broken waitpid
    # $! = EINVAL; waitpid 0, 0; # would loop forever, even with WNOHANG
    $! = EINVAL;
    my $pid = waitpid(0, WNOHANG);

    # depending on the platform, there's several possible values for
    # $pid and $!, so I'm only testing that we don't loop forever.
    #
    # Some of the complications are:
    #
    #  - watchdog() may be implemented with alarm() or fork, so there
    #    may or may not be children (this code doesn't use threads, so
    #    threads shouldn't be used)
    #
    #  - the platform may or may not implement waitpid()/wait4()

    pass("didn't block on waitpid(0, ...)");
}

done_testing();