[issue41818] Lib/pty.py major revision
Change by Soumendra Ganguly : -- pull_requests: +27900 pull_request: https://github.com/python/cpython/pull/29658 ___ Python tracker <https://bugs.python.org/issue41818> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41818] Lib/pty.py major revision
Soumendra Ganguly added the comment: Thank you for the fix. That test was created by modifying an existing test which already had that issue; it is documented in a comment by user nnorwitz in the file. If your solution resolves the problem for all the tests in "class PtyTest", then can you please also remove that comment? -- ___ Python tracker <https://bugs.python.org/issue41818> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41818] Lib/pty.py major revision
Change by Soumendra Ganguly : -- pull_requests: +22598 pull_request: https://github.com/python/cpython/pull/23740 ___ Python tracker <https://bugs.python.org/issue41818> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41818] Lib/pty.py major revision
Change by Soumendra Ganguly : -- pull_requests: +22550 pull_request: https://github.com/python/cpython/pull/23686 ___ Python tracker <https://bugs.python.org/issue41818> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41818] Lib/pty.py major revision
Change by Soumendra Ganguly : -- pull_requests: +22425 pull_request: https://github.com/python/cpython/pull/23546 ___ Python tracker <https://bugs.python.org/issue41818> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41818] Lib/pty.py major revision
Soumendra Ganguly added the comment: Update: I closed PR 23533. PR 23536 is much better. It will help us detect exact behavior on each platform, which is necessary for making pty.spawn() successfully exit its copy loop. -- ___ Python tracker <https://bugs.python.org/issue41818> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41818] Lib/pty.py major revision
Change by Soumendra Ganguly : -- pull_requests: +22418 pull_request: https://github.com/python/cpython/pull/23536 ___ Python tracker <https://bugs.python.org/issue41818> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41818] Lib/pty.py major revision
Soumendra Ganguly added the comment: PR-23533 should fix the test_master_read() issue on Solaris. Actually, instead of adding 'or PLATFORM == "SunOS"', I ended up removing the whole line and replaced it with 'if platform.system() != "Linux"' because I expect that test to fail on every platform that is not Linux. -- ___ Python tracker <https://bugs.python.org/issue41818> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41818] Lib/pty.py major revision
Change by Soumendra Ganguly : -- pull_requests: +22415 pull_request: https://github.com/python/cpython/pull/23533 ___ Python tracker <https://bugs.python.org/issue41818> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41818] Lib/pty.py major revision
Soumendra Ganguly added the comment: This is actually good news. I had not tested the code on Solaris; this confirms my suspicion that Linux is the only platform that "behaves differently". Sadly, the current Lib/pty.py code depends on such "different behavior" to exit from pty.spawn()'s copy loop, which is why it hangs on the BSDs, macOS, and now we know that it (probably) also hangs on Solaris. Adding 'or PLATFORM == "SunOS"' is the correct thing to do. I am working on this now. -- ___ Python tracker <https://bugs.python.org/issue41818> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41818] Lib/pty.py major revision
Change by Soumendra Ganguly : -- pull_requests: +22408 pull_request: https://github.com/python/cpython/pull/23526 ___ Python tracker <https://bugs.python.org/issue41818> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41818] Lib/pty.py major revision
Soumendra Ganguly added the comment: The reproducer was helpful. https://github.com/python/cpython/pull/23526 should fix this issue. -- ___ Python tracker <https://bugs.python.org/issue41818> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41818] Lib/pty.py major revision
Change by Soumendra Ganguly : -- keywords: +patch pull_requests: +21878 stage: -> patch review pull_request: https://github.com/python/cpython/pull/22962 ___ Python tracker <https://bugs.python.org/issue41818> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue26228] pty.spawn hangs on FreeBSD 9.3, 10.x, 12.1
Change by Soumendra Ganguly : -- pull_requests: +21879 pull_request: https://github.com/python/cpython/pull/22962 ___ Python tracker <https://bugs.python.org/issue26228> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41818] Lib/pty.py major revision
Soumendra Ganguly added the comment: Makes sense. I will happily make a change of terminology in the pypty2 repository after the most desirable alternative is determined based on the choice of the majority. I think 'mother/son' sounds cute while still retaining the same initials as before; people used to the older terminology will find this easy to remember. Terminology such as parent/child and server/client might make it a little confusing. -- ___ Python tracker <https://bugs.python.org/issue41818> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41494] Adds window resizing support to Lib/pty.py [ SIGWINCH ]
Soumendra Ganguly added the comment: Reopening to indicate that this issue has not been resolved. However, this thread should not be used anymore. Use this instead: https://bugs.python.org/issue41818 -- status: closed -> open ___ Python tracker <https://bugs.python.org/issue41494> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41818] Lib/pty.py major revision
New submission from Soumendra Ganguly :
The current pty library has the following issues:
1. Does not set slave termios. Documented in the source.
2. Does not set initial slave window size. Documented in the source. Does not
handle SIGWINCH. See bpo-41494, bpo-41541. This is essential in the following
practical scenarios: i. creating split windows/panes while using a terminal
multiplexer; ii. when resizing GUI terminal emulator window, especially
relevant when using tiling window managers; iii. resizing an ansi-term window
created inside a GNU Emacs frame.
3. Does not perform signal handling. Signals must be blocked during sensitive
portions of code.
4. Hangs on FreeBSD. See bpo-26228.
5. Includes deprecated functions pty.master_open(), pty.slave_open().
6. In pty.fork(), the fallback code should try using TIOCSCTTY first. It is
still using the old method of opening a tty to make it the controlling tty.
Currently even SysV based systems provide TIOCSCTTY. See
https://stackoverflow.com/questions/51593530/code-explanation-for-glibc-login-tty-function-openttyname-immediately-f
The current version of pty.spawn() uses pty.fork() internally. However,
pty.fork() closes slave and only returns (pid, master_fd). To update winsize,
access to slave is necessary. Further, slave termios must be properly set. The
proposed modifications do this by implementing a login_tty(3) based function (
tty.login() ), and using that in pty.spawn() instead of pty.fork(). tty.login()
tries TIOCSCTTY before falling back to the old SysV method because Python
currently does not provide an interface to the native login_tty(3).
7. tty.setraw() is called right after tty.tcgetattr(). This increases
redundancy of code because tty.setraw() itself makes an identical
tty.tcgetattr() call.
8. Requires testing/porting to more platforms. Solaris, Illumos, macOS,
Cygwin, etc. Windows ConPTY?
9. There should be an option in pty.spawn() to turn off slave's ECHO flag.
For example, when it is being used in a pipe. See
https://github.com/karelzak/util-linux/commit/1eee1acb245a8b724e441778dfa9b858465bf7e5
and
https://github.com/karelzak/util-linux/commit/75ccd75a2fa1194c6415c47b0024a438e26f1ad7#diff-3834a3d25eeaf20d9d0dcb05a46995f6
10. Tests are incomplete. Tests consider OSes such as Tru64 but not
{Free/Net/Open/...}BSD.
Find ongoing work here: https://github.com/8vasu/pypty2
--
components: FreeBSD, Library (Lib), Tests, Windows, macOS
messages: 377195
nosy: koobs, ned.deily, paul.moore, ronaldoussoren, soumendra, steve.dower,
tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: Lib/pty.py major revision
versions: Python 3.10, Python 3.8, Python 3.9
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[issue41541] [PATCH] Make pty.spawn set window size
Change by Soumendra Ganguly : Added file: https://bugs.python.org/file49458/script.py ___ Python tracker <https://bugs.python.org/issue41541> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41541] [PATCH] Make pty.spawn set window size
Change by Soumendra Ganguly : Added file: https://bugs.python.org/file49457/script.py ___ Python tracker <https://bugs.python.org/issue41541> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41541] [PATCH] Make pty.spawn set window size
Change by Soumendra Ganguly : Removed file: https://bugs.python.org/file49457/script.py ___ Python tracker <https://bugs.python.org/issue41541> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41541] [PATCH] Make pty.spawn set window size
Change by Soumendra Ganguly : Added file: https://bugs.python.org/file49455/before.png ___ Python tracker <https://bugs.python.org/issue41541> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41541] [PATCH] Make pty.spawn set window size
Change by Soumendra Ganguly : Added file: https://bugs.python.org/file49456/after.png ___ Python tracker <https://bugs.python.org/issue41541> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41541] [PATCH] Make pty.spawn set window size
Soumendra Ganguly added the comment: All images, test programs, and old patches have been removed. window resize test is now being performed using stty. On linux: stty -F rows x cols y On BSDs: stty -f rows x cols y to change window size. -- ___ Python tracker <https://bugs.python.org/issue41541> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue26228] pty.spawn hangs on FreeBSD 9.3, 10.x, 12.1
Change by Soumendra Ganguly : -- title: pty.spawn hangs on FreeBSD 9.3, 10.x -> pty.spawn hangs on FreeBSD 9.3, 10.x, 12.1 ___ Python tracker <https://bugs.python.org/issue26228> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41541] [PATCH] Make pty.spawn set window size
Change by Soumendra Ganguly : Removed file: https://bugs.python.org/file49393/test.py ___ Python tracker <https://bugs.python.org/issue41541> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41541] [PATCH] Make pty.spawn set window size
Change by Soumendra Ganguly : Removed file: https://bugs.python.org/file49395/pty.diff ___ Python tracker <https://bugs.python.org/issue41541> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41541] [PATCH] Make pty.spawn set window size
Change by Soumendra Ganguly : Removed file: https://bugs.python.org/file49391/before.png ___ Python tracker <https://bugs.python.org/issue41541> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41541] [PATCH] Make pty.spawn set window size
Change by Soumendra Ganguly : Removed file: https://bugs.python.org/file49390/pty.diff ___ Python tracker <https://bugs.python.org/issue41541> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41541] [PATCH] Make pty.spawn set window size
Change by Soumendra Ganguly : Removed file: https://bugs.python.org/file49392/after.png ___ Python tracker <https://bugs.python.org/issue41541> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41541] [PATCH] Make pty.spawn set window size
Change by Soumendra Ganguly : Removed file: https://bugs.python.org/file49396/pty.diff ___ Python tracker <https://bugs.python.org/issue41541> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41541] [PATCH] Make pty.spawn set window size
Change by Soumendra Ganguly : Removed file: https://bugs.python.org/file49402/pty.diff ___ Python tracker <https://bugs.python.org/issue41541> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41541] [PATCH] Make pty.spawn set window size
Change by Soumendra Ganguly : Removed file: https://bugs.python.org/file49386/pty.diff ___ Python tracker <https://bugs.python.org/issue41541> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41541] [PATCH] Make pty.spawn set window size
Soumendra Ganguly added the comment: v0.5 had introduced minor mistakes + one hack [ was using master instead of slave to set window size ]. v0.6 removes all such mistakes. -- Added file: https://bugs.python.org/file49404/pty.diff ___ Python tracker <https://bugs.python.org/issue41541> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41541] [PATCH] Make pty.spawn set window size
Soumendra Ganguly added the comment: Further note: login_tty will also enable us to set slave termios from the parent process in pty.spawn. Due to the fact that reviewing patches can be overwhelming, v0.5 removes a lot of stuff and instead simply performs window resize by calling ioctl TIOCSWINSZ on the master end of the pty. Still works as expected. -- Added file: https://bugs.python.org/file49402/pty.diff ___ Python tracker <https://bugs.python.org/issue41541> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41541] [PATCH] Make pty.spawn set window size
Soumendra Ganguly added the comment: Further proposal: Rename my _login_tty to login_tty and make it available as a part of the pty library. Note that usually login_tty accompanies openpty and forkpty on a system; for example, see https://www.man7.org/linux/man-pages/man3/login_tty.3.html https://man.openbsd.org/login_tty https://netbsd.gw.com/cgi-bin/man-cgi?login_tty++NetBSD-current However, python's pty only offers openpty and forkpty in the form of pty.openpty and pty.fork respectively. While it is true that forkpty [ pty.fork ] combines openpty, fork, and login_tty, it also closes the slave end of the pty, making it unsuitable for situations where the slave end needs to be kept open; for example, in my patch, the slave end is used to set the window size; or, in case someone wants to do even better and register a SIGWINCH handler for situations in which the window size can change. -- ___ Python tracker <https://bugs.python.org/issue41541> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41541] [PATCH] Make pty.spawn set window size
Soumendra Ganguly added the comment: v0.4 puts try-except guards around imports so that existing code does not break. -- Added file: https://bugs.python.org/file49396/pty.diff ___ Python tracker <https://bugs.python.org/issue41541> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41541] [PATCH] Make pty.spawn set window size
Soumendra Ganguly added the comment: v0.3 removes _login_pty() and defines _login_tty() instead; the latter is based on login_tty(3) from glibc. -- Added file: https://bugs.python.org/file49395/pty.diff ___ Python tracker <https://bugs.python.org/issue41541> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41541] [PATCH] Make pty.spawn set window size
Change by Soumendra Ganguly : -- title: Make pty.spawn set window size [ patch + before, after screenshots ] -> [PATCH] Make pty.spawn set window size ___ Python tracker <https://bugs.python.org/issue41541> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41541] Make pty.spawn set window size [ patch + before, after screenshots ]
Soumendra Ganguly added the comment: Additional note: I am using the i3wm window manager. No desktop environment. -- nosy: -mark.dickinson, meador.inge ___ Python tracker <https://bugs.python.org/issue41541> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41541] Make pty.spawn set window size [ patch + before, after screenshots ]
Change by Soumendra Ganguly : -- nosy: +mark.dickinson, meador.inge ___ Python tracker <https://bugs.python.org/issue41541> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41541] Make pty.spawn set window size [ patch + before, after screenshots ]
Soumendra Ganguly added the comment: I am new to BPO. Just learned how to make someone nosy. @twouters, I have attached all resources. This is ready for a review. Thank you. -- nosy: +twouters ___ Python tracker <https://bugs.python.org/issue41541> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41541] Make pty.spawn set window size [ patch + before, after screenshots ]
Soumendra Ganguly added the comment: Adding the test program [ test.py ] as an attachment. It was taken from https://docs.python.org/3/library/pty.html. How to reproduce issue: 1. Notice that the xterm window in before.png is not too wide; this makes the output of "ls" wrap around the xterm window. 2. Run test.py. 3. Run "ls". Solution: 1. Apply latest version of the patch [ pty.diff ]. 2. Run test.pty and run "ls". 3. Run "ls". -- Added file: https://bugs.python.org/file49393/test.py ___ Python tracker <https://bugs.python.org/issue41541> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41541] Make pty.spawn set window size [ patch + before, after screenshots ]
Change by Soumendra Ganguly : -- title: Make pty.spawn set window size [ + before, after screenshots ] -> Make pty.spawn set window size [ patch + before, after screenshots ] ___ Python tracker <https://bugs.python.org/issue41541> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41541] Make pty.spawn set window size [ + before, after screenshots ]
Soumendra Ganguly added the comment: Screenshot: output of "ls" after the patch is applied. -- Added file: https://bugs.python.org/file49392/after.png ___ Python tracker <https://bugs.python.org/issue41541> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41541] Make pty.spawn set window size [ + before, after screenshots ]
Soumendra Ganguly added the comment: Screenshot: output of "ls" before the patch is applied. -- title: Make pty.spawn set window size -> Make pty.spawn set window size [ + before, after screenshots ] Added file: https://bugs.python.org/file49391/before.png ___ Python tracker <https://bugs.python.org/issue41541> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41541] Make pty.spawn set window size
Soumendra Ganguly added the comment: v0.2 moves _setwinsz block to parent after fork. -- Added file: https://bugs.python.org/file49390/pty.diff ___ Python tracker <https://bugs.python.org/issue41541> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41541] Make pty.spawn set window size
Soumendra Ganguly added the comment: Note that defining _login_pty() was not a cosmetic change; it is reused in spawn(). -- ___ Python tracker <https://bugs.python.org/issue41541> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41541] Make pty.spawn set window size
Soumendra Ganguly added the comment: OS: Linux 4.19.0-9-amd64 Debian 10 GNU/Linux -- ___ Python tracker <https://bugs.python.org/issue41541> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41541] Make pty.spawn set window size
Change by Soumendra Ganguly : -- pull_requests: +20988 stage: -> patch review pull_request: https://github.com/python/cpython/pull/21861 ___ Python tracker <https://bugs.python.org/issue41541> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41541] Make pty.spawn set window size
Change by Soumendra Ganguly : -- title: Make pty.spawn set window size, make code more readable -> Make pty.spawn set window size ___ Python tracker <https://bugs.python.org/issue41541> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41541] Make pty.spawn set window size, make code more readable
New submission from Soumendra Ganguly : The example in https://docs.python.org/3/library/pty.html that mimics script(1) can be used to reproduce the problem: since window size is not set by pty.spawn, output of "ls" becomes scattered and hard to visually parse if xterm window is not in fullscreen mode. To fix the above issue, this patch makes pty.spawn set window size ( TIOCSWINSZ ). Also, this patch makes the code of pty.fork() more readable by defining _login_pty(); the latter is reused in spawn(). -- components: Library (Lib) files: pty.diff keywords: patch messages: 375326 nosy: soumendra priority: normal severity: normal status: open title: Make pty.spawn set window size, make code more readable type: behavior versions: Python 3.10, Python 3.8, Python 3.9 Added file: https://bugs.python.org/file49386/pty.diff ___ Python tracker <https://bugs.python.org/issue41541> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41494] Adds window resizing support to Lib/pty.py [ SIGWINCH ]
Change by Soumendra Ganguly : -- stage: patch review -> resolved status: open -> closed ___ Python tracker <https://bugs.python.org/issue41494> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41494] Adds window resizing support to Lib/pty.py [ SIGWINCH ]
Soumendra Ganguly added the comment: Closing because registering SIGWINCH handler from within library function is impractical. -- ___ Python tracker <https://bugs.python.org/issue41494> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41494] Adds window resizing support to Lib/pty.py [ SIGWINCH ]
Soumendra Ganguly added the comment: Possibly related issues: https://bugs.python.org/issue29070 https://bugs.python.org/issue26228 Since wspawn does not depend on OSError, it might be a possible [ not necessarily the only way ] of solving the above issues. -- ___ Python tracker <https://bugs.python.org/issue41494> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue29070] Integration tests for pty.spawn on Linux and all other platforms
Soumendra Ganguly added the comment: Hi! Can anyone please take a look at https://bugs.python.org/issue41494 [ https://github.com/python/cpython/pull/21752 ]? I think these are related. I wrote a new function called wspawn, which is like spawn+the following differences. 1. It sets window size at the beginning. 2. It registers a SIGWINCH handler. 3. It does not depend on OSError to return. It does a clean return instead. -- nosy: +soumendra ___ Python tracker <https://bugs.python.org/issue29070> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue26228] pty.spawn hangs on FreeBSD 9.3, 10.x
Soumendra Ganguly added the comment: Hi! Can anyone please take a look at https://bugs.python.org/issue41494 [ https://github.com/python/cpython/pull/21752 ]? I think these are related. I wrote a new function called wspawn, which is like spawn+the following differences. 1. It sets window size at the beginning. 2. It registers a SIGWINCH handler. 3. It does not depend on OSError to return. It does a clean return instead. -- nosy: +soumendra ___ Python tracker <https://bugs.python.org/issue26228> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41494] Adds window resizing support to Lib/pty.py [ SIGWINCH ]
Change by Soumendra Ganguly : -- title: Adds window resizing support to Lib/pty.py -> Adds window resizing support to Lib/pty.py [ SIGWINCH ] ___ Python tracker <https://bugs.python.org/issue41494> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41494] Adds window resizing support to Lib/pty.py
Change by Soumendra Ganguly : -- title: Adds window resizing support to Lib/pty.py for proper output rendering -> Adds window resizing support to Lib/pty.py ___ Python tracker <https://bugs.python.org/issue41494> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41494] Adds window resizing support to Lib/pty.py for proper output rendering
Soumendra Ganguly added the comment: The following are two [ very old ] stackoverflow threads that are relevant. https://stackoverflow.com/questions/6418678/resize-the-terminal-with-python https://stackoverflow.com/questions/16941885/want-to-resize-terminal-windows-in-python-working-but-not-quite-right -- ___ Python tracker <https://bugs.python.org/issue41494> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41494] Adds window resizing support to Lib/pty.py for proper output rendering
Change by Soumendra Ganguly : -- title: Add window resizing support [ SIGWINCH ] to Lib/pty -> Adds window resizing support to Lib/pty.py for proper output rendering ___ Python tracker <https://bugs.python.org/issue41494> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41494] Add window resizing support [ SIGWINCH ] to Lib/pty
Soumendra Ganguly added the comment: Updated diff. Changes _ekill() -- Added file: https://bugs.python.org/file49376/pty.diff ___ Python tracker <https://bugs.python.org/issue41494> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41494] Add window resizing support [ SIGWINCH ] to Lib/pty
Change by Soumendra Ganguly : -- pull_requests: +20896 stage: -> patch review pull_request: https://github.com/python/cpython/pull/21752 ___ Python tracker <https://bugs.python.org/issue41494> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41494] Add window resizing support [ SIGWINCH ] to Lib/pty
New submission from Soumendra Ganguly : This was tested using Python 3.7 after commenting out the sys.audit lines. https://docs.python.org/3/library/pty.html presents us with an example usage of pty.spawn. This example mimics script(1). However, the script(1) from util-linux has fantastic signal handing that pty.spawn does not directly provide. In fact, Lib/pty.py says "Bugs: No signal handling. Doesn't set slave termios and window size." xterm(1) on Debian 10 GNU/Linux was used to test the pty.spawn example mentioned above; upon resizing the xterm(1) window, the output of programs such as ls(1) became scattered and hard to visually parse. This patch does not modify any of the functions that are already present in Lib/pty. Instead, it exposes a new function called "wspawn" [ pty.wspawn ]. This is like pty.spawn + the following differences. 1. Window size is set at the beginning. 2. A SIGWINCH handler is registered. The old handler is saved and restored later. 3. If the above two steps fail, then cleanup is done, and an exception is raised, so that the programmer can catch the exception and use pty.spawn instead. 4. Unlike pty.spawn, this does not depend on OSError to break out of the parent mainloop. Instead, the main loop calls select with an adjustable timeout, so that waitpid with WNOHANG can be called periodically to check if the spawned child process has undergone an alteration of state. 5. While the return value is same as that of pty.spawn, this accepts an extra optional "timeout" argument for the select call. The aforementioned pty.spawn example now works well with window resizing if pty.wspawn is used in place of pty.spawn. Signed-off-by: Soumendra Ganguly -- components: Library (Lib) files: pty.diff keywords: patch messages: 374926 nosy: soumendra priority: normal severity: normal status: open title: Add window resizing support [ SIGWINCH ] to Lib/pty type: enhancement versions: Python 3.10, Python 3.7, Python 3.8, Python 3.9 Added file: https://bugs.python.org/file49372/pty.diff ___ Python tracker <https://bugs.python.org/issue41494> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
