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https://github.com/jart/cosmopolitan.git
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5b60e5a37d
The termios::c_cc field turned out to be incorrectly defined on Linux due to some confusion between the glibc and kernel definitions. We'll be using the kernel definition, since it has the strongest consensus. Fields have been have been added to struct stat for BSD compatibility such as st_birthtim, plus the GLIBC compatibility of isystem/sys/stat has been improved.
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(g_fds.p[fd].handle) == kNtFileTypeChar);
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}
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}
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