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https://github.com/jart/cosmopolitan.git
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dc0ea6640e
This change makes further effort towards improving our poll() implementation on the New Technology. The stdin worker didn't work out so well for Python so it's not being used for now. System call tracing with the --strace flag should now be less noisy now on Windows unless you modify the strace.internal.h defines to turn on some optional ones that are most useful for debugging the system call wrappers.
52 lines
3.1 KiB
C
52 lines
3.1 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/internal.h"
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#include "libc/calls/strace.internal.h"
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#include "libc/errno.h"
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#include "libc/intrin/describeflags.internal.h"
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#include "libc/nt/runtime.h"
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#include "libc/runtime/directmap.internal.h"
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#include "libc/runtime/memtrack.internal.h"
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#include "libc/str/str.h"
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/**
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* Obtains memory mapping directly from system.
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*
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* The mmap() function needs to track memory mappings in order to
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* support Windows NT and Address Sanitizer. That memory tracking can be
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* bypassed by calling this function. However the caller is responsible
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* for passing the magic memory handle on Windows NT to CloseHandle().
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*/
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struct DirectMap sys_mmap(void *addr, size_t size, int prot, int flags, int fd,
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int64_t off) {
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/* asan runtime depends on this function */
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struct DirectMap d;
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if (!IsWindows() && !IsMetal()) {
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d.addr = __sys_mmap(addr, size, prot, flags, fd, off, off);
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d.maphandle = kNtInvalidHandleValue;
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} else if (IsMetal()) {
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d = sys_mmap_metal(addr, size, prot, flags, fd, off);
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} else {
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d = sys_mmap_nt(addr, size, prot, flags, fd, off);
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}
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KERNTRACE("sys_mmap(%.12p%s, %'zu, %s, %s, %d, %'ld) → {%.12p, %p}% m", addr,
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DescribeFrame((intptr_t)addr >> 16), size, DescribeProtFlags(prot),
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DescribeMapFlags(flags), fd, off, d.addr, d.maphandle);
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return d;
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}
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