cosmopolitan/libc/runtime/msync-nt.c
Justine Tunney f684e348d4 Improve signals and memory protection
- Document sigaction()
- Simplify New Technology fork() code
- Testing and many bug fixes for mprotect()
- Distribute Intel Xed ILD in the amalgamation
- Turn Xed enums into defines to avoid DWARF bloat
- Improve polyfilling of SA_SIGINFO on BSDs and fix bugs
- setpgid(getpid(), getpid()) on Windows will ignore CTRL-C
- Work around issues relating to NT mappings being executable
- Permit automatic executable stack override via `ape_stack_pf`
2022-04-12 22:11:00 -07:00

77 lines
3.6 KiB
C

/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/internal.h"
#include "libc/intrin/kprintf.h"
#include "libc/macros.internal.h"
#include "libc/nt/files.h"
#include "libc/nt/memory.h"
#include "libc/runtime/memtrack.internal.h"
#include "libc/sysv/consts/map.h"
#include "libc/sysv/consts/msync.h"
#include "libc/sysv/consts/o.h"
#include "libc/sysv/consts/prot.h"
#define ADDR(x) ((char *)((int64_t)((uint64_t)(x) << 32) >> 16))
noasan textwindows int sys_msync_nt(char *addr, size_t size, int flags) {
int i, rc = 0;
char *a, *b, *x, *y;
for (i = FindMemoryInterval(&_mmi, (intptr_t)addr >> 16); i < _mmi.i; ++i) {
x = ADDR(_mmi.p[i].x);
y = x + _mmi.p[i].size;
if ((x <= addr && addr < y) || (x < addr + size && addr + size <= y) ||
(addr < x && y < addr + size)) {
a = MIN(MAX(addr, x), y);
b = MAX(MIN(addr + size, y), x);
if (!FlushViewOfFile(a, b - a)) {
rc = -1;
break;
}
// TODO(jart): FlushFileBuffers too on g_fds handle if MS_SYNC?
} else {
break;
}
}
return rc;
}
#if 0
noasan textwindows int sys_msync_nt(char *addr, size_t size, int flags) {
char *a, *b;
int rc, x, y, l, r, i;
rc = 0;
for (i = FindMemoryInterval(&_mmi, (intptr_t)addr >> 16); i < _mmi.i; ++i) {
if ((ADDR(_mmi.p[i].x) <= addr && addr < ADDR(_mmi.p[i].y + 1)) ||
(ADDR(_mmi.p[i].x) < addr + size &&
addr + size <= ADDR(_mmi.p[i].y + 1)) ||
(addr < ADDR(_mmi.p[i].x) && ADDR(_mmi.p[i].y + 1) < addr + size)) {
a = MIN(MAX(addr, ADDR(_mmi.p[i].x)), ADDR(_mmi.p[i].y + 1));
b = MAX(MIN(addr + size, ADDR(_mmi.p[i].y + 1)), ADDR(_mmi.p[i].x));
if (!FlushViewOfFile(a, b - a)) {
rc = -1;
break;
}
// TODO(jart): FlushFileBuffers too on g_fds handle if MS_SYNC?
} else {
break;
}
}
return rc;
}
#endif