spawn: Fix spawn_cb of gpgrt_spawn_process_fd.
* src/gpg-error.def.in (gpgrt_close_all_fds): New. * src/gpg-error.vers (gpgrt_close_all_fds): New. * src/gpg-error.h.in (GPGRT_SPAWN_INHERIT_FILE): New. (gpgrt_spawn_process_fd): SPAWN_CB having return value. * src/gpgrt-int.h (_gpgrt_spawn_process_fd): SPAWN_CB change. * src/spawn-posix.c (_gpgrt_close_all_fds): Rename from close_all_fds, and export it. (do_exec): Support the case not closing fds. (_gpgrt_spawn_process_fd): Handle return value of SPAWN_CB to determine closing all fds or not. * src/spawn-w32.c (_gpgrt_spawn_process_fd): Run SPAWN_CB. (_gpgrt_close_all_fds): New. * src/visibility.c (gpgrt_close_all_fds): New. * src/visibility.h (gpgrt_close_all_fds): New.
Now, we have the API of gpgrt_spawn_process_fd for POSIX and Windows.
Giving portable semantics for spawning a process is difficult, and it
is still difficult for users to writing a function for SPAWN_CB with
portability, but gpgrt_spawn_process_fd gives the feature of spawning
- GnuPG-bug-id: T6249
- Signed-off-by: NIIBE Yutaka <email@example.com>