mirror of
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
202 lines
7.6 KiB
C
202 lines
7.6 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/assert.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/fd.internal.h"
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#include "libc/calls/struct/stat.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/fmt/wintime.internal.h"
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#include "libc/intrin/atomic.h"
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#include "libc/intrin/bsr.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/macros.internal.h"
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#include "libc/mem/alloca.h"
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#include "libc/nt/enum/fileflagandattributes.h"
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#include "libc/nt/enum/fileinfobyhandleclass.h"
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#include "libc/nt/enum/filetype.h"
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#include "libc/nt/enum/fsctl.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/nt/struct/byhandlefileinformation.h"
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#include "libc/nt/struct/filecompressioninfo.h"
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#include "libc/nt/struct/reparsedatabuffer.h"
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#include "libc/str/str.h"
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#include "libc/str/utf16.h"
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#include "libc/sysv/consts/s.h"
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#include "libc/sysv/errfuns.h"
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static textwindows long GetSizeOfReparsePoint(int64_t fh) {
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uint32_t mem =
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sizeof(struct NtReparseDataBuffer) + PATH_MAX * sizeof(char16_t);
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void *buf = alloca(mem);
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uint32_t dwBytesReturned;
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struct NtReparseDataBuffer *rdb = (struct NtReparseDataBuffer *)buf;
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if (!DeviceIoControl(fh, kNtFsctlGetReparsePoint, 0, 0, rdb, mem,
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&dwBytesReturned, 0)) {
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return -1;
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}
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const char16_t *p =
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(const char16_t *)((char *)rdb->SymbolicLinkReparseBuffer.PathBuffer +
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rdb->SymbolicLinkReparseBuffer.PrintNameOffset);
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uint32_t n =
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rdb->SymbolicLinkReparseBuffer.PrintNameLength / sizeof(char16_t);
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uint32_t i = 0;
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uint32_t z = 0;
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while (i < n) {
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wint_t x = p[i++] & 0xffff;
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if (!IsUcs2(x)) {
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if (i < n) {
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wint_t y = p[i++] & 0xffff;
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x = MergeUtf16(x, y);
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} else {
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x = 0xfffd;
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}
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}
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if (x >= 0200) {
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z += _bsrl(tpenc(x)) >> 3;
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}
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++z;
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}
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return z;
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}
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static textwindows int sys_fstat_nt_socket(int kind, struct stat *st) {
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bzero(st, sizeof(*st));
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st->st_blksize = 512;
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st->st_mode = S_IFSOCK | 0666;
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st->st_dev = 0x44444444;
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st->st_ino = kind;
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return 0;
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}
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textwindows int sys_fstat_nt_special(int kind, struct stat *st) {
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bzero(st, sizeof(*st));
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st->st_blksize = 512;
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st->st_mode = S_IFCHR | 0666;
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st->st_dev = 0x77777777;
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st->st_ino = kind;
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return 0;
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}
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textwindows int sys_fstat_nt(int fd, struct stat *st) {
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if (fd + 0u >= g_fds.n) return ebadf();
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switch (g_fds.p[fd].kind) {
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case kFdEmpty:
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return ebadf();
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case kFdConsole:
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case kFdDevNull:
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return sys_fstat_nt_special(g_fds.p[fd].kind, st);
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case kFdSocket:
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return sys_fstat_nt_socket(g_fds.p[fd].kind, st);
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default:
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return sys_fstat_nt_handle(g_fds.p[fd].handle, st);
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}
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}
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textwindows int sys_fstat_nt_handle(int64_t handle, struct stat *out_st) {
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struct stat st = {0};
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// Always set st_blksize to avoid divide by zero issues.
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// The Linux kernel sets this for /dev/tty and similar too.
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// TODO(jart): GetVolumeInformationByHandle?
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st.st_blksize = 4096;
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st.st_gid = st.st_uid = sys_getuid_nt();
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// We'll use the "umask" to fake out the mode bits.
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uint32_t umask = atomic_load_explicit(&__umask, memory_order_acquire);
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switch (GetFileType(handle)) {
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case kNtFileTypeUnknown:
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break;
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case kNtFileTypeChar:
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st.st_mode = S_IFCHR | (0666 & ~umask);
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st.st_dev = 0x66666666;
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st.st_ino = handle;
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break;
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case kNtFileTypePipe:
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st.st_mode = S_IFIFO | (0666 & ~umask);
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st.st_dev = 0x55555555;
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st.st_ino = handle;
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break;
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case kNtFileTypeDisk: {
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struct NtByHandleFileInformation wst;
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if (!GetFileInformationByHandle(handle, &wst)) {
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return __winerr();
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}
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st.st_mode = 0444 & ~umask;
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if ((wst.dwFileAttributes & kNtFileAttributeDirectory) ||
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IsWindowsExecutable(handle)) {
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st.st_mode |= 0111 & ~umask;
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}
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st.st_flags = wst.dwFileAttributes;
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if (!(wst.dwFileAttributes & kNtFileAttributeReadonly)) {
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st.st_mode |= 0222 & ~umask;
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}
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if (wst.dwFileAttributes & kNtFileAttributeReparsePoint) {
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st.st_mode |= S_IFLNK;
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} else if (wst.dwFileAttributes & kNtFileAttributeDirectory) {
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st.st_mode |= S_IFDIR;
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} else {
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st.st_mode |= S_IFREG;
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}
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st.st_atim = FileTimeToTimeSpec(wst.ftLastAccessFileTime);
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st.st_mtim = FileTimeToTimeSpec(wst.ftLastWriteFileTime);
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st.st_birthtim = FileTimeToTimeSpec(wst.ftCreationFileTime);
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// compute time of last status change
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if (timespec_cmp(st.st_atim, st.st_mtim) > 0) {
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st.st_ctim = st.st_atim;
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} else {
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st.st_ctim = st.st_mtim;
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}
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st.st_size = (wst.nFileSizeHigh + 0ull) << 32 | wst.nFileSizeLow;
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st.st_dev = wst.dwVolumeSerialNumber;
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st.st_ino = (wst.nFileIndexHigh + 0ull) << 32 | wst.nFileIndexLow;
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st.st_nlink = wst.nNumberOfLinks;
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if (S_ISLNK(st.st_mode)) {
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if (!st.st_size) {
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long size = GetSizeOfReparsePoint(handle);
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if (size == -1) return -1;
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st.st_size = size;
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}
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} else {
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// st_size = uncompressed size
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// st_blocks*512 = physical size
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uint64_t physicalsize;
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struct NtFileCompressionInfo fci;
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if (!(wst.dwFileAttributes &
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(kNtFileAttributeDirectory | kNtFileAttributeReparsePoint)) &&
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GetFileInformationByHandleEx(handle, kNtFileCompressionInfo, &fci,
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sizeof(fci))) {
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physicalsize = fci.CompressedFileSize;
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} else {
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physicalsize = st.st_size;
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}
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st.st_blocks = ROUNDUP(physicalsize, st.st_blksize) / 512;
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}
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break;
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}
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default:
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__builtin_unreachable();
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}
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memcpy(out_st, &st, sizeof(st));
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return 0;
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}
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