mirror of
https://github.com/jart/cosmopolitan.git
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6f7d0cb1c3
This makes breaking changes to add underscores to many non-standard function names provided by the c library. MODE=tiny is now tinier and we now use smaller locks that are better for tiny apps in this mode. Some headers have been renamed to be in the same folder as the build package, so it'll be easier to know which build dependency is needed. Certain old misguided interfaces have been removed. Intel intrinsics headers are now listed in libc/isystem (but not in the amalgamation) to help further improve open source compatibility. Header complexity has also been reduced. Lastly, more shell scripts are now available.
91 lines
4.2 KiB
C
91 lines
4.2 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/sig.internal.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/calls/struct/fd.internal.h"
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#include "libc/calls/struct/iovec.h"
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#include "libc/calls/struct/iovec.internal.h"
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#include "libc/calls/syscall_support-nt.internal.h"
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#include "libc/calls/wincrash.internal.h"
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#include "libc/nt/enum/filetype.h"
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#include "libc/nt/errors.h"
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#include "libc/nt/files.h"
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#include "libc/nt/ipc.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/nt/synchronization.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, avail;
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struct NtOverlapped overlap;
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if (GetFileType(fd->handle) == kNtFileTypePipe) {
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for (;;) {
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if (!PeekNamedPipe(fd->handle, 0, 0, 0, &avail, 0)) break;
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if (avail) break;
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POLLTRACE("sys_read_nt polling");
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if (SleepEx(__SIG_POLLING_INTERVAL_MS, true) == kNtWaitIoCompletion) {
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POLLTRACE("IOCP EINTR");
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}
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if (_check_interrupts(true, g_fds.p)) {
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POLLTRACE("sys_read_nt interrupted");
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return eintr();
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}
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}
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POLLTRACE("sys_read_nt ready to read");
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}
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if (ReadFile(fd->handle, data, _clampio(size), &got,
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_offset2overlap(fd->handle, offset, &overlap))) {
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return got;
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}
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switch (GetLastError()) {
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case kNtErrorBrokenPipe: // broken pipe
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case kNtErrorNoData: // closing named pipe
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case kNtErrorHandleEof: // pread read past EOF
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return 0; //
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case kNtErrorAccessDenied: // read doesn't return EACCESS
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return ebadf(); //
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default:
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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 (_check_interrupts(true, fd)) return eintr();
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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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