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Get fork() working on Windows

Browse source 
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
Download patch file Download diff file Expand all files Collapse all files

68
libc/calls/wait4-nt.c
View file

@ -21,11 +21,14 @@
#include "libc/calls/internal.h"
#include "libc/calls/struct/rusage.h"
#include "libc/conv/conv.h"
#include "libc/macros.h"
#include "libc/nt/accounting.h"
#include "libc/nt/enum/status.h"
#include "libc/nt/enum/wait.h"
#include "libc/nt/runtime.h"
#include "libc/nt/struct/filetime.h"
#include "libc/nt/synchronization.h"
#include "libc/runtime/missioncritical.h"
#include "libc/runtime/runtime.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/w.h"
@ -33,34 +36,51 @@
textwindows int wait4$nt(int pid, int *opt_out_wstatus, int options,
struct rusage *opt_out_rusage) {
int pids[64];
int64_t handles[64];
uint32_t dwExitCode;
uint32_t i, count, timeout;
struct NtFileTime createfiletime, exitfiletime, kernelfiletime, userfiletime;
if (!isfdkind(pid, kFdProcess)) return esrch();
for (;;) {
dwExitCode = kNtStillActive;
if (!(options & WNOHANG)) {
WaitForSingleObject(g_fds.p[pid].handle, 0xffffffff);
if (pid != -1) {
if (!isfdkind(pid, kFdProcess)) {
return echild();
}
if (GetExitCodeProcess(g_fds.p[pid].handle, &dwExitCode)) {
if (dwExitCode != kNtStillActive) {
if (opt_out_wstatus) { /* @see WEXITSTATUS() */
*opt_out_wstatus = (dwExitCode & 0xff) << 8;
}
if (opt_out_rusage) {
memset(opt_out_rusage, 0, sizeof(*opt_out_rusage));
GetProcessTimes(GetCurrentProcess(), &createfiletime, &exitfiletime,
&kernelfiletime, &userfiletime);
FileTimeToTimeVal(&opt_out_rusage->ru_utime, userfiletime);
FileTimeToTimeVal(&opt_out_rusage->ru_stime, kernelfiletime);
}
return pid;
} else if (options & WNOHANG) {
return pid;
} else {
continue;
handles[0] = g_fds.p[pid].handle;
pids[0] = pid;
count = 1;
} else {
for (count = 0, i = g_fds.n; i--;) {
if (g_fds.p[i].kind == kFdProcess) {
pids[count] = i;
handles[count] = g_fds.p[i].handle;
if (++count == ARRAYLEN(handles)) break;
}
} else {
return winerr();
}
if (!count) {
return echild();
}
}
for (;;) {
dwExitCode = kNtStillActive;
if (options & WNOHANG) {
i = WaitForMultipleObjects(count, handles, false, 0);
if (i == kNtWaitTimeout) return 0;
} else {
i = WaitForMultipleObjects(count, handles, false, -1);
}
if (i == kNtWaitFailed) return winerr();
if (!GetExitCodeProcess(handles[i], &dwExitCode)) return winerr();
if (dwExitCode == kNtStillActive) continue;
if (opt_out_wstatus) { /* @see WEXITSTATUS() */
*opt_out_wstatus = (dwExitCode & 0xff) << 8;
}
if (opt_out_rusage) {
memset(opt_out_rusage, 0, sizeof(*opt_out_rusage));
GetProcessTimes(GetCurrentProcess(), &createfiletime, &exitfiletime,
&kernelfiletime, &userfiletime);
FileTimeToTimeVal(&opt_out_rusage->ru_utime, userfiletime);
FileTimeToTimeVal(&opt_out_rusage->ru_stime, kernelfiletime);
}
return pids[i];
}
}