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Make improvements for Actually Portable Emacs

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- Get SIGWINCH working again on the New Technology
- Correctly handle O_NOFOLLOW in open() on Windows
- Implement synthetic umask() functionality on Windows
- Do a better job managing file execute access on Windows
- Fill in `st_uid` and `st_gid` with username hash on Windows
- Munge UNICODE control pictures into control codes on Windows
- Do a better job ensuring Windows console settings are restored
- Introduce KPRINTF_LOG environment variable to log kprintf to a file
This commit is contained in:
Justine Tunney 2023-08-19 06:41:06 -07:00
parent 9c7b81ee0f
commit 965516e313
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GPG key ID: BE714B4575D6E328
108 changed files with 1126 additions and 807 deletions
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28
libc/calls/fstatat.c
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@ -43,10 +43,26 @@ static inline const char *__strace_fstatat_flags(char buf[12], int flags) {
/**
* Returns information about thing.
*
* @param dirfd is normally AT_FDCWD but if it's an open directory and
* file is a relative path, then file becomes relative to dirfd
* On Windows, this implementation always sets `st_uid` and `st_gid` to
* `getuid()` and `getgid()`. Anyone who relies upon the information to
* secure a multi-tenant personal computer should consider improving it
* and further note that the `st_mode` group / other bits will be clear
*
* @param dirfd is normally `AT_FDCWD` but if it's an open directory and
* file is a relative path, then `path` becomes relative to `dirfd`
* @param st is where the result is stored
* @param flags can have `AT_SYMLINK_NOFOLLOW`
* @param st is where result is stored
* @param flags can have AT_SYMLINK_NOFOLLOW
* @raise EACCES if denied access to component in path prefix
* @raise EIO if i/o error occurred while reading from filesystem
* @raise ELOOP if a symbolic link loop exists in `path`
* @raise ENAMETOOLONG if a component in `path` exceeds `NAME_MAX`
* @raise ENOENT on empty string or if component in path doesn't exist
* @raise ENOTDIR if a parent component existed that wasn't a directory
* @raise ENOTDIR if `path` is relative and `dirfd` isn't an open directory
* @raise EOVERFLOW shouldn't be possible on 64-bit systems
* @raise ELOOP may ahappen if `SYMLOOP_MAX` symlinks were dereferenced
* @raise ENAMETOOLONG may happen if `path` exceeded `PATH_MAX`
* @return 0 on success, or -1 w/ errno
* @see S_ISDIR(st.st_mode), S_ISREG()
* @asyncsignalsafe
@ -70,10 +86,12 @@ int fstatat(int dirfd, const char *path, struct stat *st, int flags) {
} else {
rc = enotsup();
}
} else if (!IsWindows()) {
} else if (IsLinux() || IsXnu() || IsFreebsd() || IsOpenbsd() || IsNetbsd()) {
rc = sys_fstatat(dirfd, path, st, flags);
} else {
} else if (IsWindows()) {
rc = sys_fstatat_nt(dirfd, path, st, flags);
} else {
rc = enosys();
}
STRACE("fstatat(%s, %#s, [%s], %s) → %d% m", DescribeDirfd(dirfd), path,
DescribeStat(rc, st), __strace_fstatat_flags(alloca(12), flags), rc);