mirror of
https://github.com/jart/cosmopolitan.git
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dc0ea6640e
This change makes further effort towards improving our poll() implementation on the New Technology. The stdin worker didn't work out so well for Python so it's not being used for now. System call tracing with the --strace flag should now be less noisy now on Windows unless you modify the strace.internal.h defines to turn on some optional ones that are most useful for debugging the system call wrappers.
71 lines
3.1 KiB
C
71 lines
3.1 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/bits/weaken.h"
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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/struct/stat.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/errfuns.h"
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#include "libc/zipos/zipos.internal.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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e = errno;
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if (weaken(__zipos_fstat)(
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(struct ZiposHandle *)(intptr_t)g_fds.p[fd].handle, &st.cosmo) !=
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-1) {
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return S_ISCHR(st.cosmo.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 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) ||
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(__isfdkind(fd, kFdFile) &&
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GetFileType(__getfdhandleactual(fd)) == kNtFileTypeChar);
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}
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}
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