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Make read() and write() signal handling atomic

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You would think this is an important bug fix, but unfortunately all UNIX
implementations I've evaluated have a bug in read that causes signals to
not be handled atomically. The only exception is the latest iteration of
Cosmopolitan's read/write polyfill on Windows, which is somewhat ironic.
This commit is contained in:
Justine Tunney 2024-09-15 00:03:48 -07:00
parent c260144843
commit baf70af780
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GPG key ID: BE714B4575D6E328
12 changed files with 520 additions and 153 deletions
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2
libc/sysv/consts.sh
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@ -465,7 +465,7 @@ syscon rlimit RLIMIT_RSS 5 5 5 5 5 5 5 127 # max physical mem
syscon rlimit RLIMIT_NPROC 6 6 7 7 7 7 7 127 # max number of processes; see fork()→EAGAIN; bsd consensus
syscon rlimit RLIMIT_NOFILE 7 7 8 8 8 8 8 127 # max number of open files; see accept()→EMFILE/ENFILE; bsd consensus
syscon rlimit RLIMIT_MEMLOCK 8 8 6 6 6 6 6 127 # max locked-in-memory address space; bsd consensus
syscon rlimit RLIMIT_AS 9\ 9 5 5 10 2 10 0 # max virtual memory size in bytes; this one actually works; fudged as RLIMIT_DATA on OpenBSD
syscon rlimit RLIMIT_AS 9 9 5 5 10 2 10 0 # max virtual memory size in bytes; this one actually works; fudged as RLIMIT_DATA on OpenBSD
syscon rlimit RLIMIT_LOCKS 10 10 127 127 127 127 127 127 # max flock() / fcntl() locks; bsd consensus
syscon rlimit RLIMIT_SIGPENDING 11 11 127 127 127 127 127 127 # max sigqueue() can enqueue; bsd consensus
syscon rlimit RLIMIT_MSGQUEUE 12 12 127 127 127 127 127 127 # meh posix message queues; bsd consensus

2
libc/sysv/consts/RLIMIT_AS.S
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@ -1,2 +1,2 @@
#include "libc/sysv/consts/syscon.internal.h"
.syscon rlimit,RLIMIT_AS,9 ,9,5,5,10,2,10,0
.syscon rlimit,RLIMIT_AS,9,9,5,5,10,2,10,0