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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
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GPG key ID: BE714B4575D6E328
53 changed files with 485 additions and 299 deletions
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55
libc/calls/fcntl-nt.c
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@ -321,63 +321,18 @@ static textwindows int sys_fcntl_nt_dupfd(int fd, int cmd, int start) {
return sys_dup_nt(fd, -1, (cmd == F_DUPFD_CLOEXEC ? O_CLOEXEC : 0), start);
}
static textwindows int sys_fcntl_nt_setfl(int fd, unsigned *flags,
unsigned mode, unsigned arg,
intptr_t *handle) {
// you may change the following:
//
// - O_NONBLOCK make read() raise EAGAIN
// - O_APPEND for toggling append mode
// - O_RANDOM alt. for posix_fadvise()
// - O_SEQUENTIAL alt. for posix_fadvise()
// - O_DIRECT works but haven't tested
//
// the other bits are ignored.
unsigned allowed = O_APPEND | O_SEQUENTIAL | O_RANDOM | O_DIRECT | O_NONBLOCK;
unsigned needreo = O_APPEND | O_SEQUENTIAL | O_RANDOM | O_DIRECT;
unsigned newflag = (*flags & ~allowed) | (arg & allowed);
if ((*flags & needreo) ^ (arg & needreo)) {
unsigned perm, share, attr;
if (GetNtOpenFlags(newflag, mode, &perm, &share, 0, &attr) == -1) {
return -1;
}
// MSDN says only these are allowed, otherwise it returns EINVAL.
attr &= kNtFileFlagBackupSemantics | kNtFileFlagDeleteOnClose |
kNtFileFlagNoBuffering | kNtFileFlagOpenNoRecall |
kNtFileFlagOpenReparsePoint | kNtFileFlagOverlapped |
kNtFileFlagPosixSemantics | kNtFileFlagRandomAccess |
kNtFileFlagSequentialScan | kNtFileFlagWriteThrough;
intptr_t hand;
if ((hand = ReOpenFile(*handle, perm, share, attr)) != -1) {
if (hand != *handle) {
CloseHandle(*handle);
*handle = hand;
}
} else {
return __winerr();
}
}
// 1. ignore flags that aren't access mode flags
// 2. return zero if nothing's changed
*flags = newflag;
return 0;
}
textwindows int sys_fcntl_nt(int fd, int cmd, uintptr_t arg) {
int rc;
BLOCK_SIGNALS;
if (__isfdkind(fd, kFdFile) || //
__isfdkind(fd, kFdSocket) || //
__isfdkind(fd, kFdConsole)) {
if (__isfdkind(fd, kFdFile) || //
__isfdkind(fd, kFdSocket) || //
__isfdkind(fd, kFdConsole) || //
__isfdkind(fd, kFdDevNull)) {
if (cmd == F_GETFL) {
rc = g_fds.p[fd].flags & (O_ACCMODE | O_APPEND | O_DIRECT | O_NONBLOCK |
O_RANDOM | O_SEQUENTIAL);
} else if (cmd == F_SETFL) {
rc = sys_fcntl_nt_setfl(fd, &g_fds.p[fd].flags, g_fds.p[fd].mode, arg,
&g_fds.p[fd].handle);
rc = sys_fcntl_nt_setfl(fd, arg);
} else if (cmd == F_GETFD) {
if (g_fds.p[fd].flags & O_CLOEXEC) {
rc = FD_CLOEXEC;