ioctl and _ioctl answered EBADF for every descriptor outside the
libSceNet socket table. Decoded call sites: PS5MC (PPSA99420, FIONBIO x3,
FIONREAD x2, TIOCGWINSZ x3), ProsperoTV (PPSA99003, FIONBIO on a pipe
once poll on pipes is in), XPSemu (PPSA97358, 21 sites).
Following FreeBSD 11.4 kern_ioctl (sys/kern/sys_generic.c:758),
vn_ioctl (sys/kern/vfs_vnops.c:1488), pipe_ioctl (sys/kern/sys_pipe.c:1346)
and randomdev_ioctl (sys/dev/random/randomdev.c:301), release/11.4.0
8c639945: FIONBIO sets or clears O_NONBLOCK through the same status
flags as fcntl F_SETFL (EFAULT for a null argument before EBADF);
FIONREAD reports the size past the offset of a file, the queued bytes of
a pipe's read end, 0 on its write end, ENOTTY on the random device, and
throws on a directory or another character device; termios requests
(group 't', TIOCGWINSZ included) fail with ENOTTY, as tcgetattr already
takes these descriptors as not a terminal; any other request throws
naming the request and descriptor kind. Sockets keep their path
unchanged.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
fcntl and sceKernelFcntl answered EBADF (sceKernelFcntl threw) for
every descriptor outside the libSceNet socket table, so files, pipes,
directories and descriptors 0 to 2 could not be queried or changed.
Observed: Yamagi Quake II (PPSA99007) stops with
"Sys_Error: change stdin to blocking Bad file descriptor", from
fcntl(fileno(stdin), F_SETFL, fcntl(0, F_GETFL, 0) & ~FNDELAY)
(yquake2 src/backends/unix/system.c:81-86).
Predicted from the titles' sources and decoded call sites: XPSemu
(PPSA97358, 97 fcntl sites: F_GETFD 12, F_SETFD 20, F_GETFL 8,
F_SETFL 9, F_DUPFD 1, F_DUPFD_CLOEXEC 7, F_GETLK 9) fails in
qemu_init_main_loop, where its pipe2 (pipe plus F_SETFD FD_CLOEXEC) and
glib's g_unix_set_fd_nonblocking (F_GETFL, F_SETFL) build the event
notifier (util/event_notifier-posix.c:44-67); VLC (PPSA85300, 43 sites,
F_RDAHEAD on every file it opens), RetroArch (PPSA99169, 17),
Porpoise (PPSA99764, 13) and Ruffle (9) call it on files and pipes.
The commands follow FreeBSD 11.4 kern_fcntl and kern_dup
(sys/kern/kern_descrip.c:479-799, 812, release/11.4.0 8c639945):
F_GETFD/F_SETFD keep the close-on-exec flag per descriptor, F_GETFL
reports the host access mode with the status flags, F_SETFL changes
only O_NONBLOCK, O_APPEND, O_ASYNC, O_FSYNC, O_DIRECT and FRDAHEAD,
F_DUPFD/F_DUPFD_CLOEXEC give the lowest free descriptor at or above the
start through dup (EINVAL for a negative start), F_DUP2FD goes through
dup2, F_RDAHEAD/F_READAHEAD set FRDAHEAD on files (EBADF on pipes,
ENOTTY elsewhere), and unknown commands fail with EINVAL. Status flags
live in a guest table shared by dup, dup2 and F_DUPFD like an open file
description. O_NONBLOCK switches a pipe (PIPE_NOWAIT on Windows, where an
empty read and a full write now report EAGAIN; the host flag on Linux).
Record locks use the host POSIX locks on Linux and throw on Windows.
Changes the host cannot model throw naming the flag and descriptor kind.
Sockets keep their path unchanged.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
std::random_device in libstdc++ reads RDSEED on x86 Linux. On an AMD
EPYC 9V45 (Zen 5) CI runner its 32-bit results repeat about 130 times
in 65536 draws, so guest_posix_random fails. libc now exports
HostEntropy_nid_no_patch, which uses getentropy (rand_s on Windows) and
throws when the OS cannot provide entropy. arc4random, arc4random_buf,
sceRandomGetRandomNumber, /dev/random and /dev/urandom reads,
std::_Random_device and sceKernelUuidCreate use it, and the arc4random
and random device TechnicalDebt entries say so.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
With the f32 denormal field of FLOAT_MODE set to keep, v_cmp_X_f32 and
v_cmpx_X_f32 read a denormal operand as zero: NVIDIA, RADV and lavapipe
all flush denormals in their float compares. Compare the operands as
sign-magnitude integers instead, with NaN handled apart. Compares with
flushed denormals are unchanged. This matches RDNA2 (gfx1036) on 256
operand pairs per opcode, with f32 denormals kept and flushed.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
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