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Get fork() working on Windows

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This is done without using Microsoft's internal APIs. MAP_PRIVATE
mappings are copied to the subprocess via a pipe, since Microsoft
doesn't want us to have proper COW pages. MAP_SHARED mappings are
remapped without needing to do any copying. Global variables need
copying along with the stack and the whole heap of anonymous mem.
This actually improves the reliability of the redbean http server
although one shouldn't expect 10k+ connections on a home computer
that isn't running software built to serve like Linux or FreeBSD.
This commit is contained in:
Justine Tunney 2020-11-13 01:27:49 -08:00
parent aea89fe832
commit db33973e0a
105 changed files with 1476 additions and 912 deletions
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12
libc/calls/internal.h
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@ -56,11 +56,11 @@ struct Fds {
extern const struct Fd kEmptyFd;
extern int g_sighandrvas[NSIG] hidden;
extern struct Fds g_fds hidden;
extern struct NtSystemInfo g_ntsysteminfo hidden;
extern struct NtStartupInfo g_ntstartupinfo hidden;
extern const struct NtSecurityAttributes kNtIsInheritable hidden;
hidden extern int g_sighandrvas[NSIG];
hidden extern struct Fds g_fds;
hidden extern struct NtSystemInfo g_ntsysteminfo;
hidden extern struct NtStartupInfo g_ntstartupinfo;
hidden extern const struct NtSecurityAttributes kNtIsInheritable;
ssize_t createfd(void) hidden;
int growfds(void) hidden;
@ -218,6 +218,7 @@ void xnutrampoline(void *, i32, i32, const struct __darwin_siginfo *,
int gettimeofday$nt(struct timeval *, struct timezone *) hidden;
bool32 isatty$nt(int) hidden;
char *getcwd$nt(char *, size_t) hidden;
int fork$nt(void) hidden;
int chdir$nt(const char *) hidden;
int close$nt(int) hidden;
int dup$nt(int, int, int) hidden;
@ -258,6 +259,7 @@ int nanosleep$nt(const struct timespec *, struct timespec *) hidden;
│ cosmopolitan § syscalls » windows nt » support ─╬─│┼
╚────────────────────────────────────────────────────────────────────────────│*/
void WinMainForked(void) hidden;
int getsetpriority$nt(int, unsigned, int, int (*)(int));
void ntcontext2linux(struct ucontext *, const struct NtContext *) hidden;
struct NtOverlapped *offset2overlap(int64_t, struct NtOverlapped *) hidden;