73 lines
2.2 KiB
Plaintext
73 lines
2.2 KiB
Plaintext
Status of Hurd support in libc. Last updated 22 Nov 1994.
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Roland McGrath <roland@gnu.ai.mit.edu>
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Everything not noted below is implemented, most of it tested. There are
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various very small things unfinished or thought to be perhaps wrong
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throughout the code, marked by comments containing `XXX'.
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* Signals and job control work, but are a very hairy area.
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There are various ways the signal thread can block and fail
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to respond when the program is losing badly.
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* We are not sure about possible races between setpgrp (A, pgrp) from
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process B vs process A receiving proc_newids.
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* The rest of libc (stdio et al) is not safe for multithreaded programs.
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mutex locks should be added to various things.
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* Recovery from faults in the signal thread is not implemented yet.
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* longjmp needs to clean up reply port, intr_port; needs thought about.
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* Cooperation with cthreads is not finished. If you link with cthreads,
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libc internal code still does not use real condition variables.
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sigsuspend currently does a busy wait where it should use a condition.
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Signal state is per kernel thread; for unwired cthreads it should be per
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cthread instead.
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* sigaltstack/sigstack do not really work: the signal stack needs thread
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variables and cthread data set up, which is not done.
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* malloc is a kludge.
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* Nothing uses mapped io. Eventually stdio and read/write/seek should. I
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have written a little code for this, but it is far from finished.
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* Resource limits do not really work; current implementation is patchy and
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inconsistent.
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* libc implicitly uses some environment variables. This is a security
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problem for setuid exec. Probably crt0 should remove the variables from
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the environment if setuid.
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* The miscellaneous msg.defs calls are only partially implemented.
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* The default SIGINFO handler needs to be written.
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* File locking is not implemented; the RPC interface is not there yet.
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* The current getitimer/setitimer implementation is a kludge.
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* mmap cannot do MAP_NOEXTEND.
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* Unimplemented calls (from the 4.4 system call list):
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acct
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fstatfs
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getfh
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getfsstat
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getrusage
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madvise
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mincore
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mount
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msync
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profil
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recvmsg
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revoke
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sendmsg
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setpriority
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sstk
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statfs
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swapon
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unmount
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