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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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17
libc/calls/openat.c
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@ -61,6 +61,19 @@
* // run `zip program.com hi.txt` beforehand
* openat(AT_FDCWD, "/zip/hi.txt", O_RDONLY);
*
* Cosmopolitan's general approach on Windows to path translation is to
*
* - replace `/' with `\`
* - translate utf-8 into utf-16
* - turn `"\X\foo"` into `"\\?\X:\foo"`
* - turn `"\X"` into `"\\?\X:\"`
* - turn `"X:\foo"` into `"\\?\X:\foo"`
*
* On Windows, opening files in `/tmp` will open them in GetTempPath(),
* which is a secure per-user directory. Opening `/dev/tty` will open a
* special console file descriptor holding both `CONIN$` and `CONOUT$`,
* which can't be fully closed. Opening `/dev/null` will open up `NUL`.
*
* @param dirfd is normally `AT_FDCWD` but if it's an open directory and
* `file` names a relative path then it's opened relative to `dirfd`
* @param file is a UTF-8 string naming filesystem entity, e.g. `foo/bar.txt`,
@ -81,12 +94,12 @@
* - `O_CLOEXEC` automatic close() upon execve()
* - `O_EXCL` exclusive access (see below)
* - `O_APPEND` open file for appending only
* - `O_NOFOLLOW` fail with ELOOP if it's a symlink
* - `O_NONBLOCK` asks read/write to fail with `EAGAIN` rather than block
* - `O_EXEC` open file for execution only; see fexecve()
* - `O_NOCTTY` prevents `file` possibly becoming controlling terminal
* - `O_NONBLOCK` asks read/write to fail with `EAGAIN` rather than block
* - `O_DIRECT` it's complicated (not supported on Apple and OpenBSD)
* - `O_DIRECTORY` useful for stat'ing (hint on UNIX but required on NT)
* - `O_NOFOLLOW` fail if it's a symlink (zero on Windows)
* - `O_DSYNC` it's complicated (zero on non-Linux/Apple)
* - `O_RSYNC` it's complicated (zero on non-Linux/Apple)
* - `O_VERIFY` it's complicated (zero on non-FreeBSD)