mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-03-03 15:38:22 +00:00
98909b1391
- Update a couple unicode data files - Disable strace during logger calls - SQLite now uses pread() / pwrite() - pread() past EOF on NT now returns 0 - Make the NT mmap() and fork() code elegant - Give NT a big performance boost with memory - Add many more mmap() tests to prove it works
73 lines
3.5 KiB
C
73 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 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/assert.h"
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#include "libc/bits/bits.h"
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#include "libc/bits/weaken.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/struct/iovec.h"
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#include "libc/errno.h"
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#include "libc/limits.h"
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#include "libc/nt/errors.h"
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#include "libc/nt/runtime.h"
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#include "libc/nt/struct/overlapped.h"
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#include "libc/sysv/errfuns.h"
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static textwindows ssize_t sys_read_nt_impl(struct Fd *fd, void *data,
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size_t size, ssize_t offset) {
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uint32_t got;
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struct NtOverlapped overlap;
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if (ReadFile(fd->handle, data, clampio(size), &got,
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offset2overlap(offset, &overlap))) {
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return got;
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} else if (
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// make sure read() returns 0 on broken pipe
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GetLastError() == kNtErrorBrokenPipe ||
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// make sure pread() returns 0 if we start reading after EOF
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GetLastError() == kNtErrorHandleEof) {
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return 0;
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} else {
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return __winerr();
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}
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}
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textwindows ssize_t sys_read_nt(struct Fd *fd, const struct iovec *iov,
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size_t iovlen, ssize_t opt_offset) {
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ssize_t rc;
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uint32_t size;
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size_t i, total;
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if (cmpxchg(&__interrupted, true, false) ||
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(weaken(_check_sigchld) && weaken(_check_sigchld)()) ||
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(weaken(_check_sigwinch) && weaken(_check_sigwinch)(fd))) {
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return eintr();
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}
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while (iovlen && !iov[0].iov_len) iov++, iovlen--;
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if (iovlen) {
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for (total = i = 0; i < iovlen; ++i) {
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if (!iov[i].iov_len) continue;
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rc = sys_read_nt_impl(fd, iov[i].iov_base, iov[i].iov_len, opt_offset);
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if (rc == -1) return -1;
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total += rc;
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if (opt_offset != -1) opt_offset += rc;
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if (rc < iov[i].iov_len) break;
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}
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return total;
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} else {
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return sys_read_nt_impl(fd, NULL, 0, opt_offset);
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}
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}
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