Sat, Nov 26
Fri, Nov 18
On Windows, closing/inheriting handles is different to POSIX.
Wed, Nov 16
We should consider to break the Assuan API maybe we can do that without too many problems for the current use cases.
I'm going to use gnupg_process_* prefix for the functions.
Tue, Nov 15
Last two points are for future changes of assuan internal; For the case of controlling fds in detail, it is possible to use spawn callback controlling fds by the routine and let no-touching (inherit) by the spawn function.
Mon, Nov 14
I don't understand the last two points: This is only about the three standard descriptors but how shall we supply more descriptors? At least in GPGME we definitely need more.
Evaluating again, I'd like to change spawn functions like this one in libgpg-error:
Thu, Nov 10
Examining again, I realized that the current spawn API (not published yet, only available in libgpg-error master) is not that useful in general (or difficult to use), while it works somehow.
Tue, Nov 8
Here is the change of GnuPG to use new spawn functions from libgpg-error:
Mon, Nov 7
Fri, Nov 4
Merged PIPE connection part into master.
For the spawn_cb, I reconsider. Having three calls complicates use, and it is actually not needed. In the case of pthread_atfork, it is needed, because fork may be used deeply in some functions. In our use cases of spawn function, prepare part of the callback can be called before calling spawn, and parent part of the callback can be called after calling spawn.
I decide use of pid_t, as there are different semantics between POSIX and Windows, *and* there is a problem of MinGW-w64. I introduce gpgrt_process_t, instead.
Oct 31 2022
Another thing when we define a type which represents process.
For pid_t, MinGW-w64 has a bug: https://bugzilla.redhat.com/show_bug.cgi?id=1397787 (or https://sourceforge.net/p/mingw-w64/mailman/mingw-w64-public/thread/1456671365-21759-1-git-send-email-sw%40weilnetz.de/).
(1) GetCurrentProcessId always returns 32-bit (DWORD), so, it can be represented in 32-bit (although DWORD is unsigned).
(2) POSIX requires pid_t should be signed integer https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_types.h.html
(3) Original MinGW defines pid_t as int (in include/sys/type.h by _pid_t). (checked in mingwrt-5.4.2)
Oct 27 2022
@werner - having another argument might be useful. Indeed, pthread_atfork has three callback functions as its arguments (prepare, parent, and child).
I general I agree.
To have clear semantics, I propose a change to gpgrt_spawn_process_fd (calling SPAWN_CB, instead of AFTER_FORK_CB, and give it return value), and exporting gpgrt_close_all_fds to users.
By the commit rE43c1e85fe29a: spawn: Expose spawn functions., spawn functions are exposed now. The API is compatible to the one of internal functions in GnuPG master (2.3).
Semantics is not well-defined portably for:
- gpgrt_spawn_process: EXCEPT only makes sense in POSIX. User could expect that the API does closing all fds except fds specified by EXCEPT in POSIX.
- gpgrt_spawn_process_fd: AFTER_FORK_CB only makes sense in POSIX. User could specify the callback so that it can control sigmask, envvar, open/close/dup-ing file descriptors, making sure releasing some resources beforehand, etc.
Oct 21 2022
I see. I understand the use cases for POSIX to keep some file descriptors.
Oct 20 2022
without this list we don't have an option to keep file descriptors open; its not just stderr but for example log files and descriptors which pare passed by other meands than libassuan functions.
- assuan_pipe_connect and internal _assuan_spawn
Oct 19 2022
Oct 14 2022
By 1/N...5/N, it works. And it shows the API needs clarification and possible modification/fixes; As written in the comment of system-w32.c, fd == POSIX fd semantics is good, which asks API/ABI break.
Oct 12 2022
Sep 22 2022
Aug 31 2022
Push the change.
Jul 27 2022
New release of libassuan is expected to make sure it's cleared off.
Jul 26 2022
Jul 22 2022
In the repo, for all related software, it's done.
Note that versions since 2020-11-07 to 2021-07-03 have major problem with non-POSIX shell, which doesn't support $(..) construct.
Jul 18 2022
Jun 9 2022
Backported to GnuPG 2.2.
Jun 8 2022
Applied the changes.
Jun 7 2022
Jun 1 2022
May 27 2022
May 25 2022
Pushed the solution which doesn't require new flag for libassuan.