-# Copyright (C) 2016-2021 all contributors <meta@public-inbox.org>
+# Copyright (C) all contributors <meta@public-inbox.org>
# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
#
# This allows vfork to be used for spawning subprocesses if
# We don't want too many DSOs: https://udrepper.livejournal.com/8790.html
package PublicInbox::Spawn;
-use strict;
+use v5.12;
use parent qw(Exporter);
use Symbol qw(gensym);
+use Fcntl qw(LOCK_EX SEEK_SET);
+use IO::Handle ();
use PublicInbox::ProcessPipe;
-our @EXPORT_OK = qw(which spawn popen_rd run_die nodatacow_dir);
+our @EXPORT_OK = qw(which spawn popen_rd run_die);
our @RLIMITS = qw(RLIMIT_CPU RLIMIT_CORE RLIMIT_DATA);
-my $all_libc = <<'ALL_LIBC'; # all *nix systems we support
+BEGIN {
+ my $all_libc = <<'ALL_LIBC'; # all *nix systems we support
#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
+#include <time.h>
+#include <stdio.h>
+#include <string.h>
/* some platforms need alloca.h, but some don't */
#if defined(__GNUC__) && !defined(alloca)
return (int)pid;
}
+static int sleep_wait(unsigned *tries, int err)
+{
+ const struct timespec req = { 0, 100000000 }; /* 100ms */
+ switch (err) {
+ case ENOBUFS: case ENOMEM: case ETOOMANYREFS:
+ if (++*tries < 50) {
+ fprintf(stderr, "sleeping on sendmsg: %s (#%u)\n",
+ strerror(err), *tries);
+ nanosleep(&req, NULL);
+ return 1;
+ }
+ default:
+ return 0;
+ }
+}
+
#if defined(CMSG_SPACE) && defined(CMSG_LEN)
#define SEND_FD_CAPA 10
#define SEND_FD_SPACE (SEND_FD_CAPA * sizeof(int))
AV *fds = (AV *)SvRV(svfds);
I32 i, nfds = av_len(fds) + 1;
int *fdp;
+ unsigned tries = 0;
if (SvOK(data)) {
iov.iov_base = SvPV(data, dlen);
*fdp++ = SvIV(*fd);
}
}
- sent = sendmsg(PerlIO_fileno(s), &msg, flags);
+ do {
+ sent = sendmsg(PerlIO_fileno(s), &msg, flags);
+ } while (sent < 0 && sleep_wait(&tries, errno));
return sent >= 0 ? newSViv(sent) : &PL_sv_undef;
}
#endif /* defined(CMSG_SPACE) && defined(CMSG_LEN) */
ALL_LIBC
-# btrfs on Linux is copy-on-write (COW) by default. As of Linux 5.7,
-# this still leads to fragmentation for SQLite and Xapian files where
-# random I/O happens, so we disable COW just for SQLite files and Xapian
-# directories. Disabling COW disables checksumming, so we only do this
-# for regeneratable files, and not canonical git storage (git doesn't
-# checksum refs, only data under $GIT_DIR/objects).
-my $set_nodatacow = $^O eq 'linux' ? <<'SET_NODATACOW' : '';
-#include <sys/ioctl.h>
-#include <sys/vfs.h>
-#include <linux/magic.h>
-#include <linux/fs.h>
-#include <dirent.h>
-#include <errno.h>
-#include <stdio.h>
-#include <string.h>
-
-void nodatacow_fd(int fd)
-{
- struct statfs buf;
- int val = 0;
-
- if (fstatfs(fd, &buf) < 0) {
- fprintf(stderr, "fstatfs: %s\\n", strerror(errno));
- return;
- }
-
- /* only btrfs is known to have this problem, so skip for non-btrfs */
- if (buf.f_type != BTRFS_SUPER_MAGIC)
- return;
-
- if (ioctl(fd, FS_IOC_GETFLAGS, &val) < 0) {
- fprintf(stderr, "FS_IOC_GET_FLAGS: %s\\n", strerror(errno));
- return;
- }
- val |= FS_NOCOW_FL;
- if (ioctl(fd, FS_IOC_SETFLAGS, &val) < 0)
- fprintf(stderr, "FS_IOC_SET_FLAGS: %s\\n", strerror(errno));
-}
-
-void nodatacow_dir(const char *dir)
-{
- DIR *dh = opendir(dir);
- int fd;
-
- if (!dh) croak("opendir(%s): %s", dir, strerror(errno));
- fd = dirfd(dh);
- if (fd >= 0)
- nodatacow_fd(fd);
- /* ENOTSUP probably won't happen under Linux... */
- closedir(dh);
-}
-SET_NODATACOW
-
-my $inline_dir = $ENV{PERL_INLINE_DIRECTORY} //= (
- $ENV{XDG_CACHE_HOME} //
- ( ($ENV{HOME} // '/nonexistent').'/.cache' )
- ).'/public-inbox/inline-c';
-
-$set_nodatacow = $all_libc = undef unless -d $inline_dir && -w _;
-if (defined $all_libc) {
- # Inline 0.64 or later has locking in multi-process env,
- # but we support 0.5 on Debian wheezy
- use Fcntl qw(:flock);
- eval {
+ my $inline_dir = $ENV{PERL_INLINE_DIRECTORY} // (
+ $ENV{XDG_CACHE_HOME} //
+ ( ($ENV{HOME} // '/nonexistent').'/.cache' )
+ ).'/public-inbox/inline-c';
+ warn "$inline_dir exists, not writable\n" if -e $inline_dir && !-w _;
+ $all_libc = undef unless -d _ && -w _;
+ if (defined $all_libc) {
+ local $ENV{PERL_INLINE_DIRECTORY} = $inline_dir;
my $f = "$inline_dir/.public-inbox.lock";
- open my $fh, '>', $f or die "failed to open $f: $!\n";
- flock($fh, LOCK_EX) or die "LOCK_EX failed on $f: $!\n";
- eval 'use Inline C => $all_libc.$set_nodatacow';
- # . ', BUILD_NOISY => 1';
+ open my $oldout, '>&', \*STDOUT or die "dup(1): $!";
+ open my $olderr, '>&', \*STDERR or die "dup(2): $!";
+ open my $fh, '+>', $f or die "open($f): $!";
+ open STDOUT, '>&', $fh or die "1>$f: $!";
+ open STDERR, '>&', $fh or die "2>$f: $!";
+ STDERR->autoflush(1);
+ STDOUT->autoflush(1);
+
+ # CentOS 7.x ships Inline 0.53, 0.64+ has built-in locking
+ flock($fh, LOCK_EX) or die "LOCK_EX($f): $!";
+ eval <<'EOM';
+use Inline C => $all_libc, BUILD_NOISY => 1;
+EOM
my $err = $@;
- my $ndc_err;
- if ($err && $set_nodatacow) { # missing Linux kernel headers
- $ndc_err = $err;
- undef $set_nodatacow;
- eval 'use Inline C => $all_libc';
+ my $ndc_err = '';
+ $err = $@;
+ open(STDERR, '>&', $olderr) or warn "restore stderr: $!";
+ open(STDOUT, '>&', $oldout) or warn "restore stdout: $!";
+ if ($err) {
+ seek($fh, 0, SEEK_SET);
+ my @msg = <$fh>;
+ warn "Inline::C build failed:\n",
+ $ndc_err, $err, "\n", @msg;
+ $all_libc = undef;
}
- flock($fh, LOCK_UN) or die "LOCK_UN failed on $f: $!\n";
- die $err if $err;
- warn $ndc_err if $ndc_err;
- };
- if ($@) {
- warn "Inline::C failed for vfork: $@\n";
- $set_nodatacow = $all_libc = undef;
}
-}
-
-unless ($all_libc) {
- require PublicInbox::SpawnPP;
- *pi_fork_exec = \&PublicInbox::SpawnPP::pi_fork_exec
-}
-unless ($set_nodatacow) {
- require PublicInbox::NDC_PP;
- no warnings 'once';
- *nodatacow_fd = \&PublicInbox::NDC_PP::nodatacow_fd;
- *nodatacow_dir = \&PublicInbox::NDC_PP::nodatacow_dir;
-}
-
-undef $set_nodatacow;
-undef $all_libc;
+ if (defined $all_libc) { # set for Gcf2
+ $ENV{PERL_INLINE_DIRECTORY} = $inline_dir;
+ } else {
+ require PublicInbox::SpawnPP;
+ *pi_fork_exec = \&PublicInbox::SpawnPP::pi_fork_exec
+ }
+} # /BEGIN
sub which ($) {
my ($file) = @_;
my $f = which($cmd->[0]) // die "$cmd->[0]: command not found\n";
my @env;
$opts ||= {};
-
- my %env = $env ? (%ENV, %$env) : %ENV;
+ my %env = (%ENV, $env ? %$env : ());
while (my ($k, $v) = each %env) {
- push @env, "$k=$v";
+ push @env, "$k=$v" if defined($v);
}
my $redir = [];
for my $child_fd (0..2) {
$opt->{1} = fileno($w);
my $pid = spawn($cmd, $env, $opt);
return ($r, $pid) if wantarray;
- my $ret = gensym;
- tie *$ret, 'PublicInbox::ProcessPipe', $pid, $r, @$opt{qw(cb arg)};
- $ret;
+ my $s = gensym;
+ tie *$s, 'PublicInbox::ProcessPipe', $pid, $r, @{$opt->{cb_arg} // []};
+ $s;
}
sub run_die ($;$$) {