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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
91 lines
4.1 KiB
C
91 lines
4.1 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/calls/struct/fd.internal.h"
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#include "libc/calls/struct/sigset.internal.h"
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#include "libc/calls/struct/stat.internal.h"
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#include "libc/calls/syscall_support-nt.internal.h"
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#include "libc/errno.h"
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#include "libc/nt/createfile.h"
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#include "libc/nt/enum/accessmask.h"
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#include "libc/nt/enum/creationdisposition.h"
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#include "libc/nt/enum/fileflagandattributes.h"
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#include "libc/nt/enum/filesharemode.h"
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#include "libc/nt/errors.h"
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#include "libc/nt/runtime.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/at.h"
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#include "libc/sysv/consts/fileno.h"
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#include "libc/sysv/errfuns.h"
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textwindows int sys_fstatat_nt(int dirfd, const char *path, struct stat *st,
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int flags) {
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// handle special files
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if (startswith(path, "/dev/")) {
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if (!strcmp(path + 5, "tty")) {
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return sys_fstat_nt_special(kFdConsole, st);
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} else if (!strcmp(path + 5, "null")) {
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return sys_fstat_nt_special(kFdDevNull, st);
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} else if (!strcmp(path + 5, "stdin")) {
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return sys_fstat_nt(STDIN_FILENO, st);
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} else if (!strcmp(path + 5, "stdout")) {
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return sys_fstat_nt(STDOUT_FILENO, st);
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} else if (!strcmp(path + 5, "stderr")) {
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return sys_fstat_nt(STDERR_FILENO, st);
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} else {
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return enoent();
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}
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}
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// convert path from utf-8 to utf-16
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uint16_t path16[PATH_MAX];
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if (__mkntpathat(dirfd, path, 0, path16) == -1) {
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return -1;
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}
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// open an actual file
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int rc;
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int64_t fh;
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int e = errno;
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uint32_t dwDesiredAccess = kNtFileGenericRead;
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BLOCK_SIGNALS;
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TryAgain:
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if ((fh = CreateFile(
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path16, dwDesiredAccess,
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kNtFileShareRead | kNtFileShareWrite | kNtFileShareDelete, 0,
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kNtOpenExisting,
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kNtFileAttributeNormal | kNtFileFlagBackupSemantics |
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((flags & AT_SYMLINK_NOFOLLOW) ? kNtFileFlagOpenReparsePoint
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: 0),
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0)) != -1) {
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rc = st ? sys_fstat_nt_handle(fh, st) : 0;
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CloseHandle(fh);
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} else if (dwDesiredAccess == kNtFileGenericRead &&
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GetLastError() == kNtErrorSharingViolation) {
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dwDesiredAccess = kNtFileReadAttributes;
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errno = e;
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goto TryAgain;
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} else {
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rc = __winerr();
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}
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ALLOW_SIGNALS;
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// mop up errors
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return __fix_enotdir(rc, path16);
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}
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