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Diffstat (limited to 'hurd/STATUS')
| -rw-r--r-- | hurd/STATUS | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/hurd/STATUS b/hurd/STATUS new file mode 100644 index 0000000000..ceb0a865d0 --- /dev/null +++ b/hurd/STATUS @@ -0,0 +1,72 @@ +Status of Hurd support in libc. Last updated 22 Nov 1994. +Roland McGrath <roland@gnu.ai.mit.edu> + +Everything not noted below is implemented, most of it tested. There are +various very small things unfinished or thought to be perhaps wrong +throughout the code, marked by comments containing `XXX'. + + +* Signals and job control work, but are a very hairy area. + There are various ways the signal thread can block and fail + to respond when the program is losing badly. + +* We are not sure about possible races between setpgrp (A, pgrp) from + process B vs process A receiving proc_newids. + +* The rest of libc (stdio et al) is not safe for multithreaded programs. + mutex locks should be added to various things. + +* Recovery from faults in the signal thread is not implemented yet. + +* longjmp needs to clean up reply port, intr_port; needs thought about. + +* Cooperation with cthreads is not finished. If you link with cthreads, + libc internal code still does not use real condition variables. + sigsuspend currently does a busy wait where it should use a condition. + Signal state is per kernel thread; for unwired cthreads it should be per + cthread instead. + +* sigaltstack/sigstack do not really work: the signal stack needs thread + variables and cthread data set up, which is not done. + +* malloc is a kludge. + +* Nothing uses mapped io. Eventually stdio and read/write/seek should. I + have written a little code for this, but it is far from finished. + +* Resource limits do not really work; current implementation is patchy and + inconsistent. + +* libc implicitly uses some environment variables. This is a security + problem for setuid exec. Probably crt0 should remove the variables from + the environment if setuid. + +* The miscellaneous msg.defs calls are only partially implemented. + +* The default SIGINFO handler needs to be written. + +* File locking is not implemented; the RPC interface is not there yet. + +* The current getitimer/setitimer implementation is a kludge. + +* mmap cannot do MAP_NOEXTEND. + +* Unimplemented calls (from the 4.4 system call list): +acct +fstatfs +getfh +getfsstat +getrusage +madvise +mincore +mount +msync +profil +recvmsg +revoke +sendmsg +setpriority +sstk +statfs +swapon +unmount |