mirror of
https://github.com/jart/cosmopolitan.git
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63 lines
2.9 KiB
C
63 lines
2.9 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/internal.h"
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#include "libc/calls/struct/metastat.internal.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/nt/enum/filetype.h"
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#include "libc/nt/files.h"
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#include "libc/sysv/consts/s.h"
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/**
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* Returns true if file descriptor is backed by character i/o.
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*
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* This function is equivalent to:
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*
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* struct stat st;
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* return stat(path, &st) != -1 && S_ISCHR(st.st_mode);
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*
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* Except faster and with fewer dependencies.
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*
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* @see isregularfile(), isdirectory(), issymlink(), fileexists()
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*/
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bool32 ischardev(int fd) {
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int e;
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union metastat st;
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if (__isfdkind(fd, kFdZip)) {
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return false;
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} else if (IsMetal()) {
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return true;
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} else if (!IsWindows()) {
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e = errno;
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if (__sys_fstat(fd, &st) != -1) {
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return S_ISCHR(METASTAT(st, st_mode));
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} else {
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errno = e;
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return false;
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}
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} else {
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return __isfdkind(fd, kFdConsole) || __isfdkind(fd, kFdDevNull) ||
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__isfdkind(fd, kFdDevRandom) ||
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(__isfdkind(fd, kFdFile) &&
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GetFileType(g_fds.p[fd].handle) == kNtFileTypeChar);
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}
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}
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