418 lines
12 KiB
Perl
418 lines
12 KiB
Perl
#***************************************************************************
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# _ _ ____ _
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# Project ___| | | | _ \| |
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# / __| | | | |_) | |
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# | (__| |_| | _ <| |___
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# \___|\___/|_| \_\_____|
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#
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# Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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#
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# This software is licensed as described in the file COPYING, which
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# you should have received as part of this distribution. The terms
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# are also available at https://curl.se/docs/copyright.html.
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#
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# You may opt to use, copy, modify, merge, publish, distribute and/or sell
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# copies of the Software, and permit persons to whom the Software is
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# furnished to do so, under the terms of the COPYING file.
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#
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# This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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# KIND, either express or implied.
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#
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# SPDX-License-Identifier: curl
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#
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###########################################################################
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package processhelp;
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use strict;
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use warnings;
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BEGIN {
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use base qw(Exporter);
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our @EXPORT = qw(
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portable_sleep
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pidfromfile
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pidexists
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pidwait
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processexists
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killpid
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killsockfilters
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killallsockfilters
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set_advisor_read_lock
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clear_advisor_read_lock
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);
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# portable sleeping needs Time::HiRes
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eval {
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no warnings "all";
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require Time::HiRes;
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};
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# portable sleeping falls back to native Sleep on Win32
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eval {
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no warnings "all";
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require Win32;
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}
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}
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use serverhelp qw(
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servername_id
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mainsockf_pidfilename
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datasockf_pidfilename
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);
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use pathhelp qw(
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os_is_win
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);
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#######################################################################
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# portable_sleep uses Time::HiRes::sleep if available and falls back
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# to the classic approach of using select(undef, undef, undef, ...).
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# even though that one is not portable due to being implemented using
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# select on Windows: https://perldoc.perl.org/perlport.html#select
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# Therefore it uses Win32::Sleep on Windows systems instead.
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#
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sub portable_sleep {
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my ($seconds) = @_;
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if($Time::HiRes::VERSION) {
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Time::HiRes::sleep($seconds);
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}
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elsif (os_is_win()) {
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Win32::Sleep($seconds*1000);
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}
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else {
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select(undef, undef, undef, $seconds);
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}
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}
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#######################################################################
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# pidfromfile returns the pid stored in the given pidfile. The value
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# of the returned pid will never be a negative value. It will be zero
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# on any file related error or if a pid can not be extracted from the
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# given file.
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#
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sub pidfromfile {
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my $pidfile = $_[0];
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my $pid = 0;
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if(-f $pidfile && -s $pidfile && open(my $pidfh, "<", "$pidfile")) {
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$pid = 0 + <$pidfh>;
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close($pidfh);
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$pid = 0 if($pid < 0);
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}
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return $pid;
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}
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#######################################################################
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# pidexists checks if a process with a given pid exists and is alive.
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# This will return the positive pid if the process exists and is alive.
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# This will return the negative pid if the process exists differently.
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# This will return 0 if the process could not be found.
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#
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sub pidexists {
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my $pid = $_[0];
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if($pid > 0) {
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# verify if currently existing Windows process
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if ($pid > 65536 && os_is_win()) {
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$pid -= 65536;
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if($^O ne 'MSWin32') {
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my $filter = "PID eq $pid";
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my $result = `tasklist -fi \"$filter\" 2>nul`;
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if(index($result, "$pid") != -1) {
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return -$pid;
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}
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return 0;
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}
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}
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# verify if currently existing and alive
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if(kill(0, $pid)) {
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return $pid;
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}
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}
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return 0;
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}
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#######################################################################
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# pidterm asks the process with a given pid to terminate gracefully.
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#
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sub pidterm {
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my $pid = $_[0];
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if($pid > 0) {
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# request the process to quit
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if ($pid > 65536 && os_is_win()) {
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$pid -= 65536;
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if($^O ne 'MSWin32') {
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my $filter = "PID eq $pid";
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my $result = `tasklist -fi \"$filter\" 2>nul`;
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if(index($result, "$pid") != -1) {
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system("taskkill -fi \"$filter\" >nul 2>&1");
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}
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return;
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}
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}
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# signal the process to terminate
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kill("TERM", $pid);
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}
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}
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#######################################################################
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# pidkill kills the process with a given pid mercilessly and forcefully.
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#
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sub pidkill {
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my $pid = $_[0];
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if($pid > 0) {
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# request the process to quit
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if ($pid > 65536 && os_is_win()) {
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$pid -= 65536;
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if($^O ne 'MSWin32') {
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my $filter = "PID eq $pid";
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my $result = `tasklist -fi \"$filter\" 2>nul`;
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if(index($result, "$pid") != -1) {
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system("taskkill -f -fi \"$filter\" >nul 2>&1");
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# Windows XP Home compatibility
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system("tskill $pid >nul 2>&1");
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}
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return;
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}
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}
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# signal the process to terminate
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kill("KILL", $pid);
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}
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}
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#######################################################################
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# pidwait waits for the process with a given pid to be terminated.
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#
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sub pidwait {
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my $pid = $_[0];
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my $flags = $_[1];
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# check if the process exists
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if ($pid > 65536 && os_is_win()) {
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if($flags == &WNOHANG) {
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return pidexists($pid)?0:$pid;
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}
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while(pidexists($pid)) {
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portable_sleep(0.01);
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}
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return $pid;
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}
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# wait on the process to terminate
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return waitpid($pid, $flags);
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}
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#######################################################################
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# processexists checks if a process with the pid stored in the given
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# pidfile exists and is alive. This will return 0 on any file related
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# error or if a pid can not be extracted from the given file. When a
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# process with the same pid as the one extracted from the given file
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# is currently alive this returns that positive pid. Otherwise, when
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# the process is not alive, will return the negative value of the pid.
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#
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sub processexists {
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use POSIX ":sys_wait_h";
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my $pidfile = $_[0];
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# fetch pid from pidfile
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my $pid = pidfromfile($pidfile);
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if($pid > 0) {
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# verify if currently alive
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if(pidexists($pid)) {
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return $pid;
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}
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else {
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# get rid of the certainly invalid pidfile
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unlink($pidfile) if($pid == pidfromfile($pidfile));
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# reap its dead children, if not done yet
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pidwait($pid, &WNOHANG);
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# negative return value means dead process
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return -$pid;
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}
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}
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return 0;
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}
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#######################################################################
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# killpid attempts to gracefully stop processes in the given pid list
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# with a SIGTERM signal and SIGKILLs those which haven't died on time.
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#
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sub killpid {
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my ($verbose, $pidlist) = @_;
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use POSIX ":sys_wait_h";
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my @requested;
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my @signalled;
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my @reapchild;
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# The 'pidlist' argument is a string of whitespace separated pids.
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return if(not defined($pidlist));
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# Make 'requested' hold the non-duplicate pids from 'pidlist'.
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@requested = split(' ', $pidlist);
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return if(not @requested);
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if(scalar(@requested) > 2) {
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@requested = sort({$a <=> $b} @requested);
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}
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for(my $i = scalar(@requested) - 2; $i >= 0; $i--) {
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if($requested[$i] == $requested[$i+1]) {
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splice @requested, $i+1, 1;
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}
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}
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# Send a SIGTERM to processes which are alive to gracefully stop them.
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foreach my $tmp (@requested) {
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chomp $tmp;
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if($tmp =~ /^(\d+)$/) {
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my $pid = $1;
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if($pid > 0) {
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if(pidexists($pid)) {
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print("RUN: Process with pid $pid signalled to die\n")
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if($verbose);
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pidterm($pid);
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push @signalled, $pid;
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}
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else {
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print("RUN: Process with pid $pid already dead\n")
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if($verbose);
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# if possible reap its dead children
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pidwait($pid, &WNOHANG);
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push @reapchild, $pid;
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}
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}
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}
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}
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# Allow all signalled processes five seconds to gracefully die.
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if(@signalled) {
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my $twentieths = 5 * 20;
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while($twentieths--) {
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for(my $i = scalar(@signalled) - 1; $i >= 0; $i--) {
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my $pid = $signalled[$i];
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if(!pidexists($pid)) {
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print("RUN: Process with pid $pid gracefully died\n")
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if($verbose);
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splice @signalled, $i, 1;
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# if possible reap its dead children
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pidwait($pid, &WNOHANG);
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push @reapchild, $pid;
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}
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}
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last if(not scalar(@signalled));
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portable_sleep(0.05);
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}
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}
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# Mercilessly SIGKILL processes still alive.
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if(@signalled) {
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foreach my $pid (@signalled) {
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if($pid > 0) {
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print("RUN: Process with pid $pid forced to die with SIGKILL\n")
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if($verbose);
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pidkill($pid);
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# if possible reap its dead children
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pidwait($pid, &WNOHANG);
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push @reapchild, $pid;
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}
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}
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}
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# Reap processes dead children for sure.
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if(@reapchild) {
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foreach my $pid (@reapchild) {
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if($pid > 0) {
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pidwait($pid, 0);
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}
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}
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}
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}
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#######################################################################
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# killsockfilters kills sockfilter processes for a given server.
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#
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sub killsockfilters {
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my ($piddir, $proto, $ipvnum, $idnum, $verbose, $which) = @_;
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my $server;
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my $pidfile;
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my $pid;
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return if($proto !~ /^(ftp|imap|pop3|smtp)$/);
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die "unsupported sockfilter: $which"
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if($which && ($which !~ /^(main|data)$/));
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$server = servername_id($proto, $ipvnum, $idnum) if($verbose);
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if(!$which || ($which eq 'main')) {
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$pidfile = mainsockf_pidfilename($piddir, $proto, $ipvnum, $idnum);
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$pid = processexists($pidfile);
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if($pid > 0) {
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printf("* kill pid for %s-%s => %d\n", $server,
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($proto eq 'ftp')?'ctrl':'filt', $pid) if($verbose);
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pidkill($pid);
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pidwait($pid, 0);
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}
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unlink($pidfile) if(-f $pidfile);
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}
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return if($proto ne 'ftp');
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if(!$which || ($which eq 'data')) {
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$pidfile = datasockf_pidfilename($piddir, $proto, $ipvnum, $idnum);
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$pid = processexists($pidfile);
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if($pid > 0) {
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printf("* kill pid for %s-data => %d\n", $server,
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$pid) if($verbose);
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pidkill($pid);
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pidwait($pid, 0);
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}
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unlink($pidfile) if(-f $pidfile);
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}
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}
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#######################################################################
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# killallsockfilters kills sockfilter processes for all servers.
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#
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sub killallsockfilters {
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my ($piddir, $verbose) = @_;
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for my $proto (('ftp', 'imap', 'pop3', 'smtp')) {
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for my $ipvnum (('4', '6')) {
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for my $idnum (('1', '2')) {
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killsockfilters($piddir, $proto, $ipvnum, $idnum, $verbose);
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}
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}
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}
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}
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sub set_advisor_read_lock {
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my ($filename) = @_;
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my $fileh;
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if(open($fileh, ">", "$filename") && close($fileh)) {
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return;
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}
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printf "Error creating lock file $filename error: $!\n";
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}
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sub clear_advisor_read_lock {
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my ($filename) = @_;
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if(-f $filename) {
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unlink($filename);
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}
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}
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1;
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