Yes, I suspect MSYS2 or bash does something special because other console applications work well. I wrote a program using the GLib spawn function and GIOChannel, and observed the same behavior. The read function got a G_IO_HUP signal without any data read, when bash exited.
2015-09-28 13:27 GMT+08:00 LRN <lrn1...@gmail.com>: > On 28.09.2015 5:01, Gang Chen wrote: > > Hi, > > I'm writing a GTK+ application with MINGW-W64, which spawns a subprocess > > running bash to execute some commands with GSubprocess and reads stdout > of > > bash (installed from MSYS2). I found that if compiled without "-mwindows" > > compilation option the main process can read the stdout, while with > > "-mwindows", the read function always returns 0 bytes read. If the main > > process runs a normal console program, or like "mingw32/bin/gcc.exe", > then > > it can read stdout even if compiled with "-mwindows". > > Might have something to do with what Cygwin/MSYS2 does to its stdout/stderr > handles on initialization (as opposed to normal W32 applications). > > You could also try to write a pure-W32 API application that does this > (spawns different child processes with stdout/stderr redirected to pipes, > reads from the pipes; read g_win32_input_stream_* functions to see which > W32 API or C Runtime functions are used by glib to create pipes and read > from them) to diagnose the problem with Cygwin/MSYS2 without involving > glib. If you manage to do so and if the problem does affect non-glib-based > main process spawning bash (but not gcc), you can direct your question to > Cygwin and/or MSYS2 developers. If the problem only affects glib-based main > process, try to put a breakpoint on g_win32_input_stream_read() (assuming > you have debug info for glib) and see what it does, and how it works > differently depending on what kind of child process you are running. > > -- > O< ascii ribbon - stop html email! - www.asciiribbon.org > > _______________________________________________ > gtk-list mailing list > gtk-list@gnome.org > https://mail.gnome.org/mailman/listinfo/gtk-list > >
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