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milescovielloandClaude Opus 5.5
472437a703
fstat on a guest socket descriptor passed the guest number to the host,
which has no such descriptor, and threw ("FillFileStat: fstat failed for
fd 268435460"); sceKernelFstat returned EBADF. FreeBSD fills the stat
buffer for a socket through soo_stat (sys/kern/sys_socket.c):
bzero((caddr_t)ub, sizeof (*ub));
ub->st_mode = S_IFSOCK;
...
if ((sb->sb_state & SBS_CANTRCVMORE) == 0 || sbavail(sb))
ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH;
ub->st_size = sbavail(sb) - sb->sb_ctl;
...
if ((sb->sb_state & SBS_CANTSENDMORE) == 0)
ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH;
and pru_sense_null (sys/kern/uipc_socket.c) adds
st_blksize = so->so_snd.sb_hiwat.
fstat and sceKernelFstat now answer a guest socket from the socket
table: S_IFSOCK, the read bits until the receive side is shut down and
drained, the write bits until the send side is shut down, st_size from
the bytes queued and st_blksize from the send buffer size, other fields
zero. shutdown records which side it closed. A closed socket descriptor
returns EBADF. The differences from the console (peer shutdown, the
host's FIONREAD and SO_SNDBUF, socketpair identity) are listed in
TechnicalDebt.md.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>