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# $OpenBSD: Proc.pm,v 1.6 2017/12/18 17:01:27 bluhm Exp $
# Copyright (c) 2010-2017 Alexander Bluhm <bluhm@openbsd.org>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
use strict;
use warnings;
package Proc;
use Carp;
use IO::File;
use List::Util qw(first);
use POSIX;
use Time::HiRes qw(time alarm sleep);
my %CHILDREN;
BEGIN {
$SIG{TERM} = $SIG{INT} = sub {
my $sig = shift;
kill TERM => keys %CHILDREN;
$SIG{TERM} = $SIG{INT} = 'DEFAULT';
POSIX::raise($sig);
};
}
END {
kill TERM => keys %CHILDREN;
$SIG{TERM} = $SIG{INT} = 'DEFAULT';
}
sub new {
my $class = shift;
my $self = { @_ };
$self->{down} ||= $self->{alarm} ? "Alarm $class" : "Shutdown $class";
$self->{func} && ref($self->{func}) eq 'CODE'
or croak "$class func not given";
!$self->{ktrace} || $self->{ktracefile}
or croak "$class ktrace file not given";
$self->{logfile}
or croak "$class log file not given";
open(my $fh, '>', $self->{logfile})
or die "$class log file $self->{logfile} create failed: $!";
$fh->autoflush;
$self->{log} = $fh;
return bless $self, $class;
}
sub run {
my $self = shift;
defined(my $pid = fork())
or die ref($self), " fork child failed: $!";
if ($pid) {
$CHILDREN{$pid} = 1;
$self->{pid} = $pid;
return $self;
}
%CHILDREN = ();
$SIG{TERM} = $SIG{INT} = 'DEFAULT';
$SIG{__DIE__} = sub {
die @_ if $^S;
warn @_;
IO::Handle::flush(\*STDERR);
POSIX::_exit(255);
};
open(STDERR, '>&', $self->{log})
or die ref($self), " dup STDERR failed: $!";
if ($self->{ktrace}) {
my @cmd = ("ktrace", "-af", $self->{ktracefile}, "-p", $$);
do { local $> = 0; system(@cmd) }
and die ref($self), " system '@cmd' failed: $?";
my $uid = $>;
do { local $> = 0; chown $uid, -1, $self->{ktracefile} }
or die ref($self),
" chown $uid '$self->{ktracefile}' failed: $?";
}
$self->child();
print STDERR $self->{up}, "\n";
alarm($self->{alarm}) if $self->{alarm};
$self->{func}->($self);
print STDERR "Shutdown ", ref($self), "\n";
IO::Handle::flush(\*STDOUT);
IO::Handle::flush(\*STDERR);
POSIX::_exit(0);
}
sub wait {
my $self = shift;
my $flags = shift;
my $pid = $self->{pid}
or croak ref($self), " no child pid";
my $kid = waitpid($pid, $flags);
if ($kid > 0) {
my $status = $?;
my $code;
$code = "exit: ". WEXITSTATUS($?) if WIFEXITED($?);
$code = "signal: ". WTERMSIG($?) if WIFSIGNALED($?);
$code = "stop: ". WSTOPSIG($?) if WIFSTOPPED($?);
return wantarray ? ($kid, $status, $code) : $kid;
}
return $kid;
}
sub loggrep {
my $self = shift;
my($regex, $timeout) = @_;
my $end;
$end = time() + $timeout if $timeout;
do {
my($kid, $status, $code) = $self->wait(WNOHANG);
if ($self->{alarm} && $kid > 0 &&
WIFSIGNALED($status) && WTERMSIG($status) == 14 ) {
# child killed by SIGALRM as expected
print {$self->{log}} "Alarm ", ref($self), "\n";
} elsif ($kid > 0 && $status != 0) {
# child terminated with failure
die ref($self), " child status: $status $code";
}
open(my $fh, '<', $self->{logfile})
or die ref($self), " log file open failed: $!";
my $match = first { /$regex/ } <$fh>;
return $match if $match;
close($fh);
# pattern not found
if ($kid == 0) {
# child still running, wait for log data
sleep .1;
} else {
# child terminated, no new log data possible
return;
}
} while ($timeout and time() < $end);
return;
}
sub up {
my $self = shift;
my $timeout = shift || 10;
$self->loggrep(qr/$self->{up}/, $timeout)
or croak ref($self), " no '$self->{up}' in $self->{logfile} ".
"after $timeout seconds";
return $self;
}
sub down {
my $self = shift;
my $timeout = shift || 20;
$self->loggrep(qr/$self->{down}/, $timeout)
or croak ref($self), " no '$self->{down}' in $self->{logfile} ".
"after $timeout seconds";
return $self;
}
1;
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