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https://github.com/jart/cosmopolitan.git
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2db2f40a98
This change gets GNU grep working. What caused it to not work, is it wouldn't write to an output file descriptor when its dev/ino equaled /dev/null's. So now we invent special dev/ino values for these files
71 lines
3.7 KiB
C
71 lines
3.7 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 2023 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/struct/fd.internal.h"
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#include "libc/calls/syscall_support-nt.internal.h"
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#include "libc/nt/createfile.h"
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#include "libc/nt/enum/fileflagandattributes.h"
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#include "libc/nt/files.h"
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#include "libc/nt/runtime.h"
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#include "libc/sysv/consts/o.h"
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textwindows int sys_fcntl_nt_setfl(int fd, unsigned flags) {
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// you may change the following:
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//
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// - O_NONBLOCK make read() raise EAGAIN
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// - O_APPEND for toggling append mode
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// - O_RANDOM alt. for posix_fadvise()
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// - O_SEQUENTIAL alt. for posix_fadvise()
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// - O_DIRECT works but haven't tested
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//
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// the other bits are ignored.
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unsigned allowed = O_APPEND | O_SEQUENTIAL | O_RANDOM | O_DIRECT | O_NONBLOCK;
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unsigned needreo = O_APPEND | O_SEQUENTIAL | O_RANDOM | O_DIRECT;
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unsigned newflag = (g_fds.p[fd].flags & ~allowed) | (flags & allowed);
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if (g_fds.p[fd].kind == kFdFile &&
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((g_fds.p[fd].flags & needreo) ^ (flags & needreo))) {
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unsigned perm, share, attr;
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if (GetNtOpenFlags(newflag, g_fds.p[fd].mode, &perm, &share, 0, &attr) ==
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-1) {
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return -1;
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}
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// MSDN says only these are allowed, otherwise it returns EINVAL.
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attr &= kNtFileFlagBackupSemantics | kNtFileFlagDeleteOnClose |
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kNtFileFlagNoBuffering | kNtFileFlagOpenNoRecall |
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kNtFileFlagOpenReparsePoint | kNtFileFlagOverlapped |
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kNtFileFlagPosixSemantics | kNtFileFlagRandomAccess |
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kNtFileFlagSequentialScan | kNtFileFlagWriteThrough;
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intptr_t hand;
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if ((hand = ReOpenFile(g_fds.p[fd].handle, perm, share, attr)) != -1) {
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if (hand != g_fds.p[fd].handle) {
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CloseHandle(g_fds.p[fd].handle);
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g_fds.p[fd].handle = hand;
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}
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} else {
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return __winerr();
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}
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}
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// 1. ignore flags that aren't access mode flags
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// 2. return zero if nothing's changed
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g_fds.p[fd].flags = newflag;
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return 0;
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}
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