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Rewrite special file handling on Windows

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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
This commit is contained in:
Justine Tunney 2023-10-14 01:06:00 -07:00
parent aca2261cda
commit 2db2f40a98
No known key found for this signature in database
GPG key ID: BE714B4575D6E328
53 changed files with 485 additions and 299 deletions
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43
libc/calls/fstat-nt.c
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@ -19,7 +19,9 @@
#include "libc/assert.h"
#include "libc/calls/calls.h"
#include "libc/calls/internal.h"
#include "libc/calls/struct/fd.internal.h"
#include "libc/calls/struct/stat.h"
#include "libc/calls/struct/stat.internal.h"
#include "libc/calls/syscall_support-nt.internal.h"
#include "libc/fmt/wintime.internal.h"
#include "libc/intrin/atomic.h"
@ -76,13 +78,47 @@ static textwindows long GetSizeOfReparsePoint(int64_t fh) {
return z;
}
textwindows int sys_fstat_nt(int64_t handle, struct stat *out_st) {
static textwindows int sys_fstat_nt_socket(int kind, struct stat *st) {
bzero(st, sizeof(*st));
st->st_blksize = 512;
st->st_mode = S_IFSOCK | 0666;
st->st_dev = 0x44444444;
st->st_ino = kind;
return 0;
}
textwindows int sys_fstat_nt_special(int kind, struct stat *st) {
bzero(st, sizeof(*st));
st->st_blksize = 512;
st->st_mode = S_IFCHR | 0666;
st->st_dev = 0x77777777;
st->st_ino = kind;
return 0;
}
textwindows int sys_fstat_nt(int fd, struct stat *st) {
if (fd + 0u >= g_fds.n) return ebadf();
switch (g_fds.p[fd].kind) {
case kFdEmpty:
return ebadf();
case kFdConsole:
case kFdDevNull:
return sys_fstat_nt_special(g_fds.p[fd].kind, st);
case kFdSocket:
return sys_fstat_nt_socket(g_fds.p[fd].kind, st);
default:
return sys_fstat_nt_handle(g_fds.p[fd].handle, st);
}
}
textwindows int sys_fstat_nt_handle(int64_t handle, struct stat *out_st) {
struct stat st = {0};
// Always set st_blksize to avoid divide by zero issues.
// The Linux kernel sets this for /dev/tty and similar too.
// TODO(jart): GetVolumeInformationByHandle?
st.st_blksize = 4096;
st.st_gid = st.st_uid = sys_getuid_nt();
// We'll use the "umask" to fake out the mode bits.
uint32_t umask = atomic_load_explicit(&__umask, memory_order_acquire);
@ -92,9 +128,13 @@ textwindows int sys_fstat_nt(int64_t handle, struct stat *out_st) {
break;
case kNtFileTypeChar:
st.st_mode = S_IFCHR | (0666 & ~umask);
st.st_dev = 0x66666666;
st.st_ino = handle;
break;
case kNtFileTypePipe:
st.st_mode = S_IFIFO | (0666 & ~umask);
st.st_dev = 0x55555555;
st.st_ino = handle;
break;
case kNtFileTypeDisk: {
struct NtByHandleFileInformation wst;
@ -126,7 +166,6 @@ textwindows int sys_fstat_nt(int64_t handle, struct stat *out_st) {
} else {
st.st_ctim = st.st_mtim;
}
st.st_gid = st.st_uid = sys_getuid_nt();
st.st_size = (wst.nFileSizeHigh + 0ull) << 32 | wst.nFileSizeLow;
st.st_dev = wst.dwVolumeSerialNumber;
st.st_ino = (wst.nFileIndexHigh + 0ull) << 32 | wst.nFileIndexLow;