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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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libc/calls/internal.h
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@ -43,6 +43,7 @@ forceinline bool __isfdkind(int fd, int kind) {
int _check_signal(bool);
int _check_cancel(void);
bool _is_canceled(void);
int sys_close_nt(int, int);
int _park_norestart(uint32_t, uint64_t);
int _park_restartable(uint32_t, uint64_t);