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This change fixes a problem that can occur with non-blocking (and also
blocking for very short times) select/poll calls. The problem occurs because
the timeout is implemented at the client side. For a non-blocking call, this
means that (depending on the code path taken in the C library) the client
could get a timeout without a full RPC round-trip to the server. Moving the
implementation of the timeout to the servers guarantees a full round-trip,
and correct results for non-blocking calls.
The modifications in this change depend on the availability of the recently
added pthread_hurd_cond_timedwait_np function in libpthread.
* boot/boot.c (io_select_common): New static function.
(S_io_select): Use io_select_common.
(S_io_select_timeout): New function which makes use of io_select_common.
* console-client/kbd-repeat.c (repeater_select): Add a timeout parameter.
* console-client/pc-mouse.c (repeater_select): Likewise.
* console-client/trans.c (io_select_common): New static function.
(netfs_S_io_select): Use io_select_common.
(netfs_S_io_select_timeout): New function which makes use of io_select_common.
* console-client/trans.h (struct consnode): Add a timeout parameter.
* hurd/io.defs (io_select_timeout): New MIG routine.
* hurd/io_reply.defs (io_select_timeout_reply): New MIG simpleroutine.
* hurd/io_request.defs (io_select_timeout_request): Likewise.
* libdiskfs/io-select.c (diskfs_S_io_select_timeout): New function.
* libnetfs/io-select.c (netfs_S_io_select_timeout): Likewise.
* libpipe/pipe.c (pipe_pair_select): Add a timeout parameter.
* libpipe/pipe.h (pipe_select_readable): Likewise.
(pipe_select_writable): Likewise.
(pipe_pair_select): Likewise.
* libpipe/pq.h: Include <hurd/hurd_types.h>.
* libtrivfs/io-select.c (trivfs_S_io_select_timeout): New function.
* pfinet/glue-include/linux/sched.h: Include <errno.h>.
(interruptible_sleep_on): Function removed, replaced with ...
(interruptible_sleep_on_timeout): New function.
(schedule): Update to use interruptible_sleep_on_timeout.
(schedule_timeout): Likewise.
* pfinet/io-ops.c (io_select_common): New static function.
(S_io_select): Use io_select_common.
(S_io_select_timeout): New function which makes use of io_select_common.
* pfinet/tunnel.c (io_select_common): New static function.
(trivfs_S_io_select): Use io_select_common.
(trivfs_S_io_select_timeout): New function which makes use of io_select_common.
* pflocal/connq.c (connq_listen): Replace noblock with a timeout parameter.
* pflocal/connq.h: Include <hurd/hurd_types.h>.
(connq_listen): Update declaration to replace noblock with a timeout parameter.
* pflocal/io.c (io_select_common): New static function.
(S_io_select): Use io_select_common.
(S_io_select_timeout): New function which makes use of io_select_common.
* pflocal/socket.c (S_socket_accept): Update call to connq_listen to match new
declaration.
* storeio/io.c (trivfs_S_io_select_timeout): New function.
* term/ptyio.c (pty_io_select): Add a timeout parameter.
* term/term.h (pty_io_select): Likewise.
* term/users.c (io_select_common): New static function.
(trivfs_S_io_select): Use io_select_common.
(trivfs_S_io_select_timeout): New function which makes use of io_select_common.
* trans/fifo.c (io_select_common): New static function.
(trivfs_S_io_select): Use io_select_common.
(trivfs_S_io_select_timeout): New function which makes use of io_select_common.
* trans/firmlink.c (trivfs_S_io_select_timeout): New function.
* trans/new-fifo.c (io_select_common): New static function.
(trivfs_S_io_select): Use io_select_common.
(trivfs_S_io_select_timeout): New function which makes use of io_select_common.
* trans/null.c (trivfs_S_io_select_timeout): New function.
* trans/streamio.c (io_select_common): New static function.
(trivfs_S_io_select): Use io_select_common.
(trivfs_S_io_select_timeout): New function which makes use of io_select_common.
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* Fix spelling with codespell[1] and manually review it.
[1] http://git.profusion.mobi/cgit.cgi/lucas/codespell/
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* io.defs (io_read, io_write, io_select): Comment fixes.
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* hurd_types.defs (loff_t, ino64_t): New types, 64 bits.
(off_t): Type removed.
(off_array_t): Use loff_t instead of off_t as base type.
* hurd_types.h (off_array_t): Likewise.
[_FILE_OFFSET_BITS != 64] (io_statbuf_t, fsys_statfsbuf_t): Define
using struct stat64/statfs64 instead of struct stat/statfs.
* io.defs (io_identity): Use ino64_t for FILENO.
* fs.defs (file_set_size): off_t -> loff_t
* fs_notify.defs (file_changed): Likewise.
* io.defs (io_write, io_read, io_seek): Likewise.
* io_request.defs: Likewise for those RPCs' *_request variants.
* io_reply.defs: Likewise for those RPCs' *_reply variants.
* hurd_types.defs (size_t): Remove type.
* fs.defs (dir_readdir): Use vm_size_t for AMOUNT.
* socket.defs (socket_send, socket_recv): Likewise.
* pfinet.defs (pfinet_siocgifconf): Likewise.
* io.defs (io_write, io_read, io_readable): Likewise.
* io_request.defs: Likewise for those RPCs' *_request variants.
* io_reply.defs: Likewise for those RPCs' *_reply variants.
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* io.defs (io_write, io_read, io_readable): Use size_t in place
of mach_msg_type_number_t.
* socket.defs (socket_send, socket_recv): Likewise.
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* io.defs (io_map_segment): New RPC.
(io_map): Refer to io_map_segment; label as deprecated.
(io_map_cntl, io_get_conch, io_release_conch, io_prenotify,
io_eofnotify, io_postnotify, io_readnotify, io_readsleep,
io_sigio): Label as deprecated.
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* io.defs (io_revoke): New RPC.
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(io_identity): New RPC.
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(io_verify_identity): New RPC.
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server side ports are desired.
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is defined.
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arrays.
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Make arg SELECT_TYPE inout, remove SELECT_RESULT out arg.
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int.
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