X-Git-Url: http://www.git.stargrave.org/?a=blobdiff_plain;f=lib%2FPublicInbox%2FSyscall.pm;h=777c44d0660269d9753de2682b9000e04db5b4f2;hb=4eee5af6011cc8cdefb66c9729952c7eff5c0b0b;hp=a2b7490a574ae92b4b5cd01b57a73b65b2445488;hpb=760c225c3831a9164f11ddf9d5318ad6c3f84bb8;p=public-inbox.git

diff --git a/lib/PublicInbox/Syscall.pm b/lib/PublicInbox/Syscall.pm
index a2b7490a..777c44d0 100644
--- a/lib/PublicInbox/Syscall.pm
+++ b/lib/PublicInbox/Syscall.pm
@@ -2,6 +2,10 @@
 # specifically the Debian libsys-syscall-perl 0.25-6 version to
 # fix upstream regressions in 0.25.
 #
+# See devel/syscall-list in the public-inbox source tree for maintenance
+# <https://80x24.org/public-inbox.git>, and machines from the GCC Farm:
+# <https://cfarm.tetaneutral.net/>
+#
 # This license differs from the rest of public-inbox
 #
 # This module is Copyright (c) 2005 Six Apart, Ltd.
@@ -12,10 +16,10 @@
 # You may distribute under the terms of either the GNU General Public
 # License or the Artistic License, as specified in the Perl README file.
 package PublicInbox::Syscall;
-use strict;
-use v5.10.1;
+use v5.12;
 use parent qw(Exporter);
-use POSIX qw(ENOENT EEXIST ENOSYS EINVAL O_NONBLOCK);
+use POSIX qw(ENOENT ENOSYS EINVAL O_NONBLOCK);
+use Socket qw(SOL_SOCKET SCM_RIGHTS);
 use Config;
 
 # $VERSION = '0.25'; # Sys::Syscall version
@@ -42,8 +46,19 @@ use constant {
 	EPOLL_CTL_ADD => 1,
 	EPOLL_CTL_DEL => 2,
 	EPOLL_CTL_MOD => 3,
+	SIZEOF_int => $Config{intsize},
+	SIZEOF_size_t => $Config{sizesize},
+	NUL => "\0",
+};
+
+use constant {
+	TMPL_size_t => SIZEOF_size_t == 8 ? 'Q' : 'L',
+	BYTES_4_hole => SIZEOF_size_t == 8 ? 'L' : '',
+	# cmsg_len, cmsg_level, cmsg_type
+	SIZEOF_cmsghdr => SIZEOF_int * 2 + SIZEOF_size_t,
 };
 
+my @BYTES_4_hole = BYTES_4_hole ? (0) : ();
 our $loaded_syscall = 0;
 
 sub _load_syscall {
@@ -68,6 +83,7 @@ our (
      $SYS_renameat2,
      );
 
+my ($SYS_sendmsg, $SYS_recvmsg);
 my $SYS_fstatfs; # don't need fstatfs64, just statfs.f_type
 my ($FS_IOC_GETFLAGS, $FS_IOC_SETFLAGS);
 my $SFD_CLOEXEC = 02000000; # Perl does not expose O_CLOEXEC
@@ -99,6 +115,8 @@ if ($^O eq "linux") {
         $SYS_signalfd4 = 327;
         $SYS_renameat2 //= 353;
 	$SYS_fstatfs = 100;
+	$SYS_sendmsg = 370;
+	$SYS_recvmsg = 372;
 	$FS_IOC_GETFLAGS = 0x80046601;
 	$FS_IOC_SETFLAGS = 0x40046602;
     } elsif ($machine eq "x86_64") {
@@ -108,6 +126,8 @@ if ($^O eq "linux") {
         $SYS_signalfd4 = 289;
 	$SYS_renameat2 //= 316;
 	$SYS_fstatfs = 138;
+	$SYS_sendmsg = 46;
+	$SYS_recvmsg = 47;
 	$FS_IOC_GETFLAGS = 0x80086601;
 	$FS_IOC_SETFLAGS = 0x40086602;
     } elsif ($machine eq 'x32') {
@@ -117,6 +137,8 @@ if ($^O eq "linux") {
         $SYS_signalfd4 = 1073742113;
 	$SYS_renameat2 //= 0x40000000 + 316;
 	$SYS_fstatfs = 138;
+	$SYS_sendmsg = 0x40000206;
+	$SYS_recvmsg = 0x40000207;
 	$FS_IOC_GETFLAGS = 0x80046601;
 	$FS_IOC_SETFLAGS = 0x40046602;
     } elsif ($machine eq 'sparc64') {
@@ -128,6 +150,8 @@ if ($^O eq "linux") {
 	$SYS_renameat2 //= 345;
 	$SFD_CLOEXEC = 020000000;
 	$SYS_fstatfs = 158;
+	$SYS_sendmsg = 114;
+	$SYS_recvmsg = 113;
 	$FS_IOC_GETFLAGS = 0x40086601;
 	$FS_IOC_SETFLAGS = 0x80086602;
     } elsif ($machine =~ m/^parisc/) {
@@ -144,6 +168,8 @@ if ($^O eq "linux") {
         $SYS_signalfd4 = 313;
 	$SYS_renameat2 //= 357;
 	$SYS_fstatfs = 100;
+	$SYS_sendmsg = 341;
+	$SYS_recvmsg = 342;
 	$FS_IOC_GETFLAGS = 0x40086601;
 	$FS_IOC_SETFLAGS = 0x80086602;
     } elsif ($machine eq "ppc") {
@@ -156,7 +182,7 @@ if ($^O eq "linux") {
 	$SYS_fstatfs = 100;
 	$FS_IOC_GETFLAGS = 0x40086601;
 	$FS_IOC_SETFLAGS = 0x80086602;
-    } elsif ($machine =~ m/^s390/) {
+    } elsif ($machine =~ m/^s390/) { # untested, no machine on cfarm
         $SYS_epoll_create = 249;
         $SYS_epoll_ctl    = 250;
         $SYS_epoll_wait   = 251;
@@ -164,13 +190,15 @@ if ($^O eq "linux") {
         $SYS_signalfd4 = 322;
 	$SYS_renameat2 //= 347;
 	$SYS_fstatfs = 100;
-    } elsif ($machine eq "ia64") {
+	$SYS_sendmsg = 370;
+	$SYS_recvmsg = 372;
+    } elsif ($machine eq 'ia64') { # untested, no machine on cfarm
         $SYS_epoll_create = 1243;
         $SYS_epoll_ctl    = 1244;
         $SYS_epoll_wait   = 1245;
         $u64_mod_8        = 1;
         $SYS_signalfd4 = 289;
-    } elsif ($machine eq "alpha") {
+    } elsif ($machine eq "alpha") { # untested, no machine on cfarm
         # natural alignment, ints are 32-bits
         $SYS_epoll_create = 407;
         $SYS_epoll_ctl    = 408;
@@ -178,7 +206,7 @@ if ($^O eq "linux") {
         $u64_mod_8        = 1;
         $SYS_signalfd4 = 484;
 	$SFD_CLOEXEC = 010000000;
-    } elsif ($machine eq "aarch64") {
+    } elsif ($machine eq 'aarch64' || $machine eq 'loongarch64') {
         $SYS_epoll_create = 20;  # (sys_epoll_create1)
         $SYS_epoll_ctl    = 21;
         $SYS_epoll_wait   = 22;  # (sys_epoll_pwait)
@@ -187,10 +215,11 @@ if ($^O eq "linux") {
         $SYS_signalfd4 = 74;
 	$SYS_renameat2 //= 276;
 	$SYS_fstatfs = 44;
+	$SYS_sendmsg = 211;
+	$SYS_recvmsg = 212;
 	$FS_IOC_GETFLAGS = 0x80086601;
 	$FS_IOC_SETFLAGS = 0x40086602;
-    } elsif ($machine =~ m/arm(v\d+)?.*l/) {
-        # ARM OABI
+    } elsif ($machine =~ m/arm(v\d+)?.*l/) { # ARM OABI (untested on cfarm)
         $SYS_epoll_create = 250;
         $SYS_epoll_ctl    = 251;
         $SYS_epoll_wait   = 252;
@@ -198,7 +227,9 @@ if ($^O eq "linux") {
         $SYS_signalfd4 = 355;
 	$SYS_renameat2 //= 382;
 	$SYS_fstatfs = 100;
-    } elsif ($machine =~ m/^mips64/) {
+	$SYS_sendmsg = 296;
+	$SYS_recvmsg = 297;
+    } elsif ($machine =~ m/^mips64/) { # cfarm only has 32-bit userspace
         $SYS_epoll_create = 5207;
         $SYS_epoll_ctl    = 5208;
         $SYS_epoll_wait   = 5209;
@@ -206,9 +237,11 @@ if ($^O eq "linux") {
         $SYS_signalfd4 = 5283;
 	$SYS_renameat2 //= 5311;
 	$SYS_fstatfs = 5135;
+	$SYS_sendmsg = 5045;
+	$SYS_recvmsg = 5046;
 	$FS_IOC_GETFLAGS = 0x40046601;
 	$FS_IOC_SETFLAGS = 0x80046602;
-    } elsif ($machine =~ m/^mips/) {
+    } elsif ($machine =~ m/^mips/) { # 32-bit, tested on mips64 cfarm machine
         $SYS_epoll_create = 4248;
         $SYS_epoll_ctl    = 4249;
         $SYS_epoll_wait   = 4250;
@@ -216,6 +249,8 @@ if ($^O eq "linux") {
         $SYS_signalfd4 = 4324;
 	$SYS_renameat2 //= 4351;
 	$SYS_fstatfs = 4100;
+	$SYS_sendmsg = 4179;
+	$SYS_recvmsg = 4177;
 	$FS_IOC_GETFLAGS = 0x40046601;
 	$FS_IOC_SETFLAGS = 0x80046602;
     } else {
@@ -354,12 +389,10 @@ sub rename_noreplace ($$) {
 	}
 }
 
-sub nodatacow_fh {
-	return if !defined($SYS_fstatfs);
-	my $buf = '';
-	vec($buf, 120 * 8 - 1, 1) = 0;
+sub nodatacow_fh ($) {
 	my ($fh) = @_;
-	syscall($SYS_fstatfs, fileno($fh), $buf) == 0 or
+	my $buf = "\0" x 120;
+	syscall($SYS_fstatfs // return, fileno($fh), $buf) == 0 or
 		return warn("fstatfs: $!\n");
 	my $f_type = unpack('l!', $buf); # statfs.f_type is a signed word
 	return if $f_type != 0x9123683E; # BTRFS_SUPER_MAGIC
@@ -378,6 +411,80 @@ sub nodatacow_dir {
 	if (open my $fh, '<', $_[0]) { nodatacow_fh($fh) }
 }
 
+sub CMSG_ALIGN ($) { ($_[0] + SIZEOF_size_t - 1) & ~(SIZEOF_size_t - 1) }
+use constant CMSG_ALIGN_SIZEOF_cmsghdr => CMSG_ALIGN(SIZEOF_cmsghdr);
+sub CMSG_SPACE ($) { CMSG_ALIGN($_[0]) + CMSG_ALIGN_SIZEOF_cmsghdr }
+sub CMSG_LEN ($) { CMSG_ALIGN_SIZEOF_cmsghdr + $_[0] }
+use constant msg_controllen => CMSG_SPACE(10 * SIZEOF_int) + 16; # 10 FDs
+
+if (defined($SYS_sendmsg) && defined($SYS_recvmsg)) {
+no warnings 'once';
+*send_cmd4 = sub ($$$$) {
+	my ($sock, $fds, undef, $flags) = @_;
+	my $iov = pack('P'.TMPL_size_t,
+			$_[2] // NUL, length($_[2] // NUL) || 1);
+	my $cmsghdr = pack(TMPL_size_t . # cmsg_len
+			'LL' .  # cmsg_level, cmsg_type,
+			('i' x scalar(@$fds)),
+			CMSG_LEN(scalar(@$fds) * SIZEOF_int), # cmsg_len
+			SOL_SOCKET, SCM_RIGHTS, # cmsg_{level,type}
+			@$fds); # CMSG_DATA
+	my $mh = pack('PL' . # msg_name, msg_namelen (socklen_t (U32))
+			BYTES_4_hole . # 4-byte padding on 64-bit
+			'P'.TMPL_size_t . # msg_iov, msg_iovlen,
+			'P'.TMPL_size_t . # msg_control, msg_controllen,
+			'i', # msg_flags
+			NUL, 0, # msg_name, msg_namelen (unused)
+			@BYTES_4_hole,
+			$iov, 1, # msg_iov, msg_iovlen
+			$cmsghdr, # msg_control
+			CMSG_SPACE(scalar(@$fds) * SIZEOF_int), # msg_controllen
+			0); # msg_flags
+	my $sent;
+	my $try = 0;
+	do {
+		$sent = syscall($SYS_sendmsg, fileno($sock), $mh, $flags);
+	} while ($sent < 0 &&
+			($!{ENOBUFS} || $!{ENOMEM} || $!{ETOOMANYREFS}) &&
+			(++$try < 50) &&
+			warn "sleeping on sendmsg: $! (#$try)\n" &&
+			select(undef, undef, undef, 0.1) == 0);
+	$sent >= 0 ? $sent : undef;
+};
+
+*recv_cmd4 = sub ($$$) {
+	my ($sock, undef, $len) = @_;
+	vec($_[1], ($len + 1) * 8, 1) = 0;
+	my $cmsghdr = "\0" x msg_controllen; # 10 * sizeof(int)
+	my $iov = pack('P'.TMPL_size_t, $_[1], $len);
+	my $mh = pack('PL' . # msg_name, msg_namelen (socklen_t (U32))
+			BYTES_4_hole . # 4-byte padding on 64-bit
+			'P'.TMPL_size_t . # msg_iov, msg_iovlen,
+			'P'.TMPL_size_t . # msg_control, msg_controllen,
+			'i', # msg_flags
+			NUL, 0, # msg_name, msg_namelen (unused)
+			@BYTES_4_hole,
+			$iov, 1, # msg_iov, msg_iovlen
+			$cmsghdr, # msg_control
+			msg_controllen,
+			0); # msg_flags
+	my $r = syscall($SYS_recvmsg, fileno($sock), $mh, 0);
+	return (undef) if $r < 0; # $! set
+	substr($_[1], $r, length($_[1]), '');
+	my @ret;
+	if ($r > 0) {
+		my ($len, $lvl, $type, @fds) = unpack(TMPL_size_t . # cmsg_len
+					'LLi*', # cmsg_level, cmsg_type, @fds
+					$cmsghdr);
+		if ($lvl == SOL_SOCKET && $type == SCM_RIGHTS) {
+			$len -= CMSG_ALIGN_SIZEOF_cmsghdr;
+			@ret = @fds[0..(($len / SIZEOF_int) - 1)];
+		}
+	}
+	@ret;
+};
+}
+
 1;
 
 =head1 WARRANTY