mirror of
https://github.com/jart/cosmopolitan.git
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66 lines
3.5 KiB
C
66 lines
3.5 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et 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/calls.h"
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#include "libc/calls/syscall-sysv.internal.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/intrin/describeflags.h"
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#include "libc/intrin/directmap.h"
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#include "libc/intrin/strace.h"
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#include "libc/nt/runtime.h"
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#include "libc/runtime/memtrack.internal.h"
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#include "libc/runtime/runtime.h"
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#include "libc/runtime/syslib.internal.h"
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#include "libc/sysv/errfuns.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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* @asyncsignalsafe
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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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struct DirectMap d;
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if ((__virtualsize += size) >= __virtualmax) {
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d.maphandle = kNtInvalidHandleValue;
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d.addr = (void *)enomem();
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} else if (IsXnuSilicon()) {
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long p = _sysret(__syslib->__mmap(addr, size, prot, flags, fd, off));
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d.maphandle = kNtInvalidHandleValue;
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d.addr = (void *)p;
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} else 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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if (d.addr == MAP_FAILED)
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__virtualsize -= size;
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KERNTRACE("sys_mmap(%.12p, %'zu, %s, %s, %d, %'ld) → {%.12p, %p}% m", addr,
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size, DescribeProtFlags(prot), DescribeMapFlags(flags), fd, off,
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d.addr, d.maphandle);
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return d;
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}
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