}
SET_NODATACOW
+my $fdpass = <<'FDPASS';
+#include <sys/types.h>
+#include <sys/uio.h>
+#include <sys/socket.h>
+
+#if defined(CMSG_SPACE) && defined(CMSG_LEN)
+union my_cmsg {
+ struct cmsghdr hdr;
+ char pad[sizeof(struct cmsghdr)+8+sizeof(int)+8];
+};
+
+int send_fd(int sockfd, int fd)
+{
+ struct msghdr msg = { 0 };
+ struct iovec iov;
+ union my_cmsg cmsg = { 0 };
+
+ iov.iov_base = &msg.msg_namelen;
+ iov.iov_len = 1;
+ msg.msg_iov = &iov;
+ msg.msg_iovlen = 1;
+ msg.msg_control = &cmsg.hdr;
+ msg.msg_controllen = CMSG_SPACE(sizeof(int));
+
+ cmsg.hdr.cmsg_level = SOL_SOCKET;
+ cmsg.hdr.cmsg_type = SCM_RIGHTS;
+ cmsg.hdr.cmsg_len = CMSG_LEN(sizeof(int));
+ *(int *)CMSG_DATA(&cmsg.hdr) = fd;
+
+ return sendmsg(sockfd, &msg, 0) >= 0;
+}
+
+int recv_fd(int sockfd)
+{
+ union my_cmsg cmsg = { 0 };
+ struct msghdr msg = { 0 };
+ struct iovec iov;
+ int fd = -1;
+
+ iov.iov_base = &msg.msg_namelen;
+ iov.iov_len = 1;
+ msg.msg_iov = &iov;
+ msg.msg_iovlen = 1;
+ msg.msg_control = &cmsg.hdr;
+ msg.msg_controllen = CMSG_SPACE(sizeof(int));
+
+ if (recvmsg(sockfd, &msg, 0) <= 0)
+ return -1;
+
+ errno = EDOM;
+ if (cmsg.hdr.cmsg_level == SOL_SOCKET &&
+ cmsg.hdr.cmsg_type == SCM_RIGHTS &&
+ cmsg.hdr.cmsg_len == CMSG_LEN(sizeof(int)))
+ fd = *(int *)CMSG_DATA(&cmsg.hdr);
+
+ return fd;
+}
+#endif /* defined(CMSG_SPACE) && defined(CMSG_LEN) */
+FDPASS
+
my $inline_dir = $ENV{PERL_INLINE_DIRECTORY} //= (
$ENV{XDG_CACHE_HOME} //
( ($ENV{HOME} // '/nonexistent').'/.cache' )
).'/public-inbox/inline-c';
-$set_nodatacow = $vfork_spawn = undef unless -d $inline_dir && -w _;
+$set_nodatacow = $vfork_spawn = $fdpass = undef unless -d $inline_dir && -w _;
if (defined $vfork_spawn) {
# Inline 0.64 or later has locking in multi-process env,
# but we support 0.5 on Debian wheezy
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 => $vfork_spawn . $set_nodatacow';
+ eval 'use Inline C => $vfork_spawn . $fdpass . $set_nodatacow';
my $err = $@;
my $ndc_err;
if ($err && $set_nodatacow) { # missing Linux kernel headers
$ndc_err = $err;
undef $set_nodatacow;
- eval 'use Inline C => $vfork_spawn';
+ eval 'use Inline C => $vfork_spawn . $fdpass';
}
flock($fh, LOCK_UN) or die "LOCK_UN failed on $f: $!\n";
die $err if $err;
};
if ($@) {
warn "Inline::C failed for vfork: $@\n";
- $set_nodatacow = $vfork_spawn = undef;
+ $set_nodatacow = $vfork_spawn = $fdpass = undef;
}
}
*nodatacow_fd = \&PublicInbox::NDC_PP::nodatacow_fd;
*nodatacow_dir = \&PublicInbox::NDC_PP::nodatacow_dir;
}
+unless (__PACKAGE__->can('recv_fd')) {
+ eval { # try the XS IO::FDPass package
+ require IO::FDPass;
+ no warnings 'once';
+ *recv_fd = \&IO::FDPass::recv;
+ *send_fd = \&IO::FDPass::send;
+ };
+}
+
undef $set_nodatacow;
undef $vfork_spawn;
+undef $fdpass;
sub which ($) {
my ($file) = @_;