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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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3
libc/calls/sigtimedwait-nt.c
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@ -32,6 +32,7 @@
#include "libc/sysv/consts/sig.h"
#include "libc/sysv/errfuns.h"
#include "libc/thread/posixthread.internal.h"
#ifdef __x86_64__
textwindows static int sys_sigtimedwait_nt_check(sigset_t syncsigs,
siginfo_t *opt_info,
@ -111,3 +112,5 @@ textwindows int sys_sigtimedwait_nt(const sigset_t *set, siginfo_t *opt_info,
ALLOW_SIGNALS;
return rc;
}
#endif /* __x86_64__ */