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perlipc.pod: fix the "exec from signal handler" example #22136

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merged 4 commits into from
Aug 1, 2024
Merged

perlipc.pod: fix the "exec from signal handler" example #22136

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62b2c14
perlipc.pod: fix the "exec from signal handler" example
stepnem Apr 11, 2024
9db854f
perlipc.pod: improve "exec from signal handler" signal mask comment
stepnem Apr 11, 2024
b9b7257
Update AUTHORS (add stepnem)
stepnem Jul 24, 2024
75c06e2
perlipc.pod: avoid race in "exec from signal handler" example
stepnem Apr 12, 2024
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1 change: 1 addition & 0 deletions AUTHORS
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Original file line number Diff line number Diff line change
Expand Up @@ -1478,6 +1478,7 @@ Zbynek Vyskovsky <[email protected]>
Zefram <[email protected]>
Zsbán Ambrus <[email protected]>
Ævar Arnfjörð Bjarmason <[email protected]>
Štěpán Němec <[email protected]>
Дилян Палаузов <[email protected]>
Михаил Козачков <[email protected]>
小鸡 <[email protected]>
8 changes: 6 additions & 2 deletions pod/perlipc.pod
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Expand Up @@ -204,12 +204,16 @@ info to show that it works; it should be replaced with the real code.
my $script = File::Basename::basename($0);
my $SELF = catfile($FindBin::Bin, $script);

# POSIX unmasks the sigprocmask properly
$SIG{HUP} = sub {
print "got SIGHUP\n";
exec($SELF, @ARGV) || die "$0: couldn't restart: $!";
exec($SELF, @ARGV) || die "$0: couldn't restart: $!";
};

# Make sure SIGHUP isn't blocked (as it normally would be, due to the
# handler function calling exec rather than returning)
POSIX::sigprocmask(&POSIX::SIG_UNBLOCK,
POSIX::SigSet->new(&POSIX::SIGHUP));

code();

sub code {
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