2022-05-23 22:06:11 +00:00
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#ifndef COSMOPOLITAN_LIBC_CALLS_SYSCALL_SUPPORT_NT_INTERNAL_H_
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#define COSMOPOLITAN_LIBC_CALLS_SYSCALL_SUPPORT_NT_INTERNAL_H_
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2023-09-06 10:54:42 +00:00
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#include "libc/limits.h"
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Make improvements
- We now serialize the file descriptor table when spawning / executing
processes on Windows. This means you can now inherit more stuff than
just standard i/o. It's needed by bash, which duplicates the console
to file descriptor #255. We also now do a better job serializing the
environment variables, so you're less likely to encounter E2BIG when
using your bash shell. We also no longer coerce environ to uppercase
- execve() on Windows now remotely controls its parent process to make
them spawn a replacement for itself. Then it'll be able to terminate
immediately once the spawn succeeds, without having to linger around
for the lifetime as a shell process for proxying the exit code. When
process worker thread running in the parent sees the child die, it's
given a handle to the new child, to replace it in the process table.
- execve() and posix_spawn() on Windows will now provide CreateProcess
an explicit handle list. This allows us to remove handle locks which
enables better fork/spawn concurrency, with seriously correct thread
safety. Other codebases like Go use the same technique. On the other
hand fork() still favors the conventional WIN32 inheritence approach
which can be a little bit messy, but is *controlled* by guaranteeing
perfectly clean slates at both the spawning and execution boundaries
- sigset_t is now 64 bits. Having it be 128 bits was a mistake because
there's no reason to use that and it's only supported by FreeBSD. By
using the system word size, signal mask manipulation on Windows goes
very fast. Furthermore @asyncsignalsafe funcs have been rewritten on
Windows to take advantage of signal masking, now that it's much more
pleasant to use.
- All the overlapped i/o code on Windows has been rewritten for pretty
good signal and cancelation safety. We're now able to ensure overlap
data structures are cleaned up so long as you don't longjmp() out of
out of a signal handler that interrupted an i/o operation. Latencies
are also improved thanks to the removal of lots of "busy wait" code.
Waits should be optimal for everything except poll(), which shall be
the last and final demon we slay in the win32 i/o horror show.
- getrusage() on Windows is now able to report RUSAGE_CHILDREN as well
as RUSAGE_SELF, thanks to aggregation in the process manager thread.
2023-10-08 12:36:18 +00:00
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#include "libc/nt/struct/overlapped.h"
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2022-05-23 22:06:11 +00:00
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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COSMOPOLITAN_C_START_
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2023-07-24 15:31:54 +00:00
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bool isdirectory_nt(const char *);
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bool isregularfile_nt(const char *);
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bool issymlink_nt(const char *);
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bool32 ntsetprivilege(int64_t, const char16_t *, uint32_t);
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2023-08-14 05:42:25 +00:00
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char16_t *__create_pipe_name(char16_t *);
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2023-07-24 15:31:54 +00:00
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int __mkntpath(const char *, char16_t[hasatleast PATH_MAX]);
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int __mkntpath2(const char *, char16_t[hasatleast PATH_MAX], int);
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int __mkntpathat(int, const char *, int, char16_t[hasatleast PATH_MAX]);
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int ntaccesscheck(const char16_t *, uint32_t) paramsnonnull();
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int sys_pause_nt(void);
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int64_t __fix_enotdir(int64_t, char16_t *);
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int64_t __fix_enotdir3(int64_t, char16_t *, char16_t *);
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2022-05-23 22:06:11 +00:00
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int64_t __winerr(void) nocallback privileged;
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int64_t ntreturn(uint32_t);
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2023-07-24 15:31:54 +00:00
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void *GetProcAddressModule(const char *, const char *);
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void WinMainForked(void);
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2022-05-23 22:06:11 +00:00
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Make improvements
- We now serialize the file descriptor table when spawning / executing
processes on Windows. This means you can now inherit more stuff than
just standard i/o. It's needed by bash, which duplicates the console
to file descriptor #255. We also now do a better job serializing the
environment variables, so you're less likely to encounter E2BIG when
using your bash shell. We also no longer coerce environ to uppercase
- execve() on Windows now remotely controls its parent process to make
them spawn a replacement for itself. Then it'll be able to terminate
immediately once the spawn succeeds, without having to linger around
for the lifetime as a shell process for proxying the exit code. When
process worker thread running in the parent sees the child die, it's
given a handle to the new child, to replace it in the process table.
- execve() and posix_spawn() on Windows will now provide CreateProcess
an explicit handle list. This allows us to remove handle locks which
enables better fork/spawn concurrency, with seriously correct thread
safety. Other codebases like Go use the same technique. On the other
hand fork() still favors the conventional WIN32 inheritence approach
which can be a little bit messy, but is *controlled* by guaranteeing
perfectly clean slates at both the spawning and execution boundaries
- sigset_t is now 64 bits. Having it be 128 bits was a mistake because
there's no reason to use that and it's only supported by FreeBSD. By
using the system word size, signal mask manipulation on Windows goes
very fast. Furthermore @asyncsignalsafe funcs have been rewritten on
Windows to take advantage of signal masking, now that it's much more
pleasant to use.
- All the overlapped i/o code on Windows has been rewritten for pretty
good signal and cancelation safety. We're now able to ensure overlap
data structures are cleaned up so long as you don't longjmp() out of
out of a signal handler that interrupted an i/o operation. Latencies
are also improved thanks to the removal of lots of "busy wait" code.
Waits should be optimal for everything except poll(), which shall be
the last and final demon we slay in the win32 i/o horror show.
- getrusage() on Windows is now able to report RUSAGE_CHILDREN as well
as RUSAGE_SELF, thanks to aggregation in the process manager thread.
2023-10-08 12:36:18 +00:00
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ssize_t sys_readwrite_nt(int, void *, size_t, ssize_t, int64_t, uint64_t,
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bool32 (*)(int64_t, void *, uint32_t, uint32_t *,
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struct NtOverlapped *));
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2022-05-23 22:06:11 +00:00
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COSMOPOLITAN_C_END_
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_LIBC_CALLS_SYSCALL_SUPPORT_NT_INTERNAL_H_ */
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