# This license differs from the rest of public-inbox
#
# This module is Copyright (c) 2005 Six Apart, Ltd.
-# Copyright (C) 2019 all contributors <meta@public-inbox.org>
+# Copyright (C) 2019-2020 all contributors <meta@public-inbox.org>
#
# All rights reserved.
#
# License or the Artistic License, as specified in the Perl README file.
package PublicInbox::Syscall;
use strict;
-use POSIX qw(ENOSYS SEEK_CUR);
+use parent qw(Exporter);
+use POSIX qw(ENOSYS O_NONBLOCK);
use Config;
-require Exporter;
-use vars qw(@ISA @EXPORT_OK %EXPORT_TAGS $VERSION);
-
-$VERSION = "0.25";
-@ISA = qw(Exporter);
-@EXPORT_OK = qw(epoll_ctl epoll_create epoll_wait
+# $VERSION = '0.25'; # Sys::Syscall version
+our @EXPORT_OK = qw(epoll_ctl epoll_create epoll_wait
EPOLLIN EPOLLOUT EPOLLET
EPOLL_CTL_ADD EPOLL_CTL_DEL EPOLL_CTL_MOD
- EPOLLONESHOT EPOLLEXCLUSIVE);
-%EXPORT_TAGS = (epoll => [qw(epoll_ctl epoll_create epoll_wait
+ EPOLLONESHOT EPOLLEXCLUSIVE
+ signalfd $SFD_NONBLOCK);
+our %EXPORT_TAGS = (epoll => [qw(epoll_ctl epoll_create epoll_wait
EPOLLIN EPOLLOUT
EPOLL_CTL_ADD EPOLL_CTL_DEL EPOLL_CTL_MOD
EPOLLONESHOT EPOLLEXCLUSIVE)],
);
-use constant EPOLLIN => 1;
-use constant EPOLLOUT => 4;
-# use constant EPOLLERR => 8;
-# use constant EPOLLHUP => 16;
-# use constant EPOLLRDBAND => 128;
-use constant EPOLLEXCLUSIVE => (1 << 28);
-use constant EPOLLONESHOT => (1 << 30);
-use constant EPOLLET => (1 << 31);
-use constant EPOLL_CTL_ADD => 1;
-use constant EPOLL_CTL_DEL => 2;
-use constant EPOLL_CTL_MOD => 3;
+use constant {
+ EPOLLIN => 1,
+ EPOLLOUT => 4,
+ # EPOLLERR => 8,
+ # EPOLLHUP => 16,
+ # EPOLLRDBAND => 128,
+ EPOLLEXCLUSIVE => (1 << 28),
+ EPOLLONESHOT => (1 << 30),
+ EPOLLET => (1 << 31),
+ EPOLL_CTL_ADD => 1,
+ EPOLL_CTL_DEL => 2,
+ EPOLL_CTL_MOD => 3,
+};
our $loaded_syscall = 0;
$SYS_epoll_create,
$SYS_epoll_ctl,
$SYS_epoll_wait,
+ $SYS_signalfd4,
);
+my $SFD_CLOEXEC = 02000000; # Perl does not expose O_CLOEXEC
+our $SFD_NONBLOCK = O_NONBLOCK;
our $no_deprecated = 0;
if ($^O eq "linux") {
my $u64_mod_8 = 0;
# if we're running on an x86_64 kernel, but a 32-bit process,
- # we need to use the i386 syscall numbers.
+ # we need to use the x32 or i386 syscall numbers.
if ($machine eq "x86_64" && $Config{ptrsize} == 4) {
- $machine = "i386";
+ $machine = $Config{cppsymbols} =~ /\b__ILP32__=1\b/ ? 'x32' : 'i386';
}
# Similarly for mips64 vs mips
$SYS_epoll_create = 254;
$SYS_epoll_ctl = 255;
$SYS_epoll_wait = 256;
+ $SYS_signalfd4 = 327;
} elsif ($machine eq "x86_64") {
$SYS_epoll_create = 213;
$SYS_epoll_ctl = 233;
$SYS_epoll_wait = 232;
+ $SYS_signalfd4 = 289;
+ } elsif ($machine eq 'x32') {
+ $SYS_epoll_create = 1073742037;
+ $SYS_epoll_ctl = 1073742057;
+ $SYS_epoll_wait = 1073742056;
+ $SYS_signalfd4 = 1073742113;
+ } elsif ($machine eq 'sparc64') {
+ $SYS_epoll_create = 193;
+ $SYS_epoll_ctl = 194;
+ $SYS_epoll_wait = 195;
+ $u64_mod_8 = 1;
+ $SYS_signalfd4 = 317;
+ $SFD_CLOEXEC = 020000000;
} elsif ($machine =~ m/^parisc/) {
$SYS_epoll_create = 224;
$SYS_epoll_ctl = 225;
$SYS_epoll_wait = 226;
$u64_mod_8 = 1;
+ $SYS_signalfd4 = 309;
} elsif ($machine =~ m/^ppc64/) {
$SYS_epoll_create = 236;
$SYS_epoll_ctl = 237;
$SYS_epoll_wait = 238;
$u64_mod_8 = 1;
+ $SYS_signalfd4 = 313;
} elsif ($machine eq "ppc") {
$SYS_epoll_create = 236;
$SYS_epoll_ctl = 237;
$SYS_epoll_wait = 238;
$u64_mod_8 = 1;
+ $SYS_signalfd4 = 313;
} elsif ($machine =~ m/^s390/) {
$SYS_epoll_create = 249;
$SYS_epoll_ctl = 250;
$SYS_epoll_wait = 251;
$u64_mod_8 = 1;
+ $SYS_signalfd4 = 322;
} elsif ($machine eq "ia64") {
$SYS_epoll_create = 1243;
$SYS_epoll_ctl = 1244;
$SYS_epoll_wait = 1245;
$u64_mod_8 = 1;
+ $SYS_signalfd4 = 289;
} elsif ($machine eq "alpha") {
# natural alignment, ints are 32-bits
$SYS_epoll_create = 407;
$SYS_epoll_ctl = 408;
$SYS_epoll_wait = 409;
$u64_mod_8 = 1;
+ $SYS_signalfd4 = 484;
+ $SFD_CLOEXEC = 010000000;
} elsif ($machine eq "aarch64") {
$SYS_epoll_create = 20; # (sys_epoll_create1)
$SYS_epoll_ctl = 21;
$SYS_epoll_wait = 22; # (sys_epoll_pwait)
$u64_mod_8 = 1;
$no_deprecated = 1;
+ $SYS_signalfd4 = 74;
} elsif ($machine =~ m/arm(v\d+)?.*l/) {
# ARM OABI
$SYS_epoll_create = 250;
$SYS_epoll_ctl = 251;
$SYS_epoll_wait = 252;
$u64_mod_8 = 1;
+ $SYS_signalfd4 = 355;
} elsif ($machine =~ m/^mips64/) {
$SYS_epoll_create = 5207;
$SYS_epoll_ctl = 5208;
$SYS_epoll_wait = 5209;
$u64_mod_8 = 1;
+ $SYS_signalfd4 = 5283;
} elsif ($machine =~ m/^mips/) {
$SYS_epoll_create = 4248;
$SYS_epoll_ctl = 4249;
$SYS_epoll_wait = 4250;
$u64_mod_8 = 1;
+ $SYS_signalfd4 = 4324;
} else {
# as a last resort, try using the *.ph files which may not
# exist or may be wrong
$SYS_epoll_create = eval { &SYS_epoll_create; } || 0;
$SYS_epoll_ctl = eval { &SYS_epoll_ctl; } || 0;
$SYS_epoll_wait = eval { &SYS_epoll_wait; } || 0;
+
+ # Note: do NOT add new syscalls to depend on *.ph, here.
+ # Better to miss syscalls (so we can fallback to IO::Poll)
+ # than to use wrong ones, since the names are not stable
+ # (at least not on FreeBSD), if the actual numbers are.
}
if ($u64_mod_8) {
return $ct;
}
+sub signalfd ($$$) {
+ my ($fd, $signos, $flags) = @_;
+ if ($SYS_signalfd4) {
+ my $set = POSIX::SigSet->new(@$signos);
+ syscall($SYS_signalfd4, $fd, "$$set",
+ # $Config{sig_count} is NSIG, so this is NSIG/8:
+ int($Config{sig_count}/8),
+ $flags|$SFD_CLOEXEC);
+ } else {
+ $! = ENOSYS;
+ undef;
+ }
+}
+
1;
=head1 WARRANTY