Mail Archives: cygwin/2007/10/18/19:28:12
On Thu, 2007-10-18 at 09:42 -0700, Christian Kreibich wrote:
> I'll now try to get this snippet also mentioned in the FAQ to work:
>
> HMODULE h = LoadLibrary("cygwin1.dll");
> void (*init)() = GetProcAddress(h, "cygwin_dll_init");
> init();
Okay, I tweaked this slightly to get it to build:
typedef int (__cdecl *MYPROC)();
int _tmain(int argc, _TCHAR* argv[])
{
HMODULE h = LoadLibrary(TEXT("cygwin1.dll"));
MYPROC init = (MYPROC) GetProcAddress(h, "cygwin_dll_init");
init();
This delays the problem -- I now see C0000005 exceptions triggered
inside my library when writing to stderr later, after it has worked for
a while. The only difference between the working and crashing fprintf()s
is that before the second call, a different function inside my library
has been entered and a few variables declared (I'm happy to provide
details on request). The tail part of the strace looks as follows:
461 34209 [main] foo 2020 build_argv: argv[0] = 'foo.exe'
89 34298 [main] foo 2020 build_argv: argc 1
412 34710 [main] foo 2020 build_fh_pc: fh 0x61167878
187 34897 [main] foo 2020 open_shared: name (null), n 0, shared 0x60020000 (wanted 0x60020000), h 0x7F4
140 35037 [main] foo 2020 _pinfo::set_ctty: old no ctty
103 35140 [main] foo 2020 _pinfo::set_ctty: attaching ctty /dev/console sid 2020, pid 2020, pgid 2020, tty->pgid 0, tty->sid 2020
2487 37627 [main] foo 2020 fhandler_base::set_flags: flags 0x10002, supplied_bin 0x0
135 37762 [main] foo 2020 fhandler_base::set_flags: O_TEXT/O_BINARY set in flags 0x10000
91 37853 [main] foo 2020 fhandler_base::set_flags: filemode set to binary
457 38310 [main] foo 2020 init_cygheap::manage_console_count: fhandler_console::open: console_count 1, amount 1, ctty /dev/console, avoid_freeing_console 0
132 38442 [main] foo 2020 fhandler_console::open: opened conin$ 0xF, conout$ 0x13
224 38666 [main] foo 2020 fhandler_console::output_tcsetattr: 0 = tcsetattr (,6002001C) (ENABLE FLAGS 3) (lflag 107 oflag 9)
407 39073 [main] foo 2020 build_fh_pc: fh 0x61167A80
125 39198 [main] foo 2020 fhandler_base::set_flags: flags 0x10002, supplied_bin 0x0
91 39289 [main] foo 2020 fhandler_base::set_flags: O_TEXT/O_BINARY set in flags 0x10000
90 39379 [main] foo 2020 fhandler_base::set_flags: filemode set to binary
370 39749 [main] foo 2020 init_cygheap::manage_console_count: fhandler_console::open: console_count 2, amount 1, ctty /dev/console, avoid_freeing_console 0
337 40086 [main] foo 2020 fhandler_console::open: opened conin$ 0x3, conout$ 0x17
224 40310 [main] foo 2020 fhandler_console::output_tcsetattr: 0 = tcsetattr (,6002001C) (ENABLE FLAGS 3) (lflag 107 oflag 9)
416 40726 [main] foo 2020 build_fh_pc: fh 0x61167C88
126 40852 [main] foo 2020 fhandler_base::set_flags: flags 0x10002, supplied_bin 0x0
92 40944 [main] foo 2020 fhandler_base::set_flags: O_TEXT/O_BINARY set in flags 0x10000
88 41032 [main] foo 2020 fhandler_base::set_flags: filemode set to binary
368 41400 [main] foo 2020 init_cygheap::manage_console_count: fhandler_console::open: console_count 3, amount 1, ctty /dev/console, avoid_freeing_console 0
128 41528 [main] foo 2020 fhandler_console::open: opened conin$ 0x7, conout$ 0x1B
205 41733 [main] foo 2020 fhandler_console::output_tcsetattr: 0 = tcsetattr (,6002001C) (ENABLE FLAGS 3) (lflag 107 oflag 9)
355 42088 [main] foo 2020 fhandler_console::need_invisible: invisible_console 0
168 42256 [main] foo 2020 dll_crt0_1: user_data->main 0x0
92 42348 [main] foo 2020 __set_errno: void dll_crt0_1(void*):948 val 0
89 42437 [main] foo 2020 _cygtls::remove: wait 0xFFFFFFFF
85 42522 [main] foo 2020 _cygtls::remove: removed 0x12CE64 element 0
569 43091 [main] foo 2020 sig_send: sendsig 0x704, pid 2020, signal -34, its_me 1
109 43200 [main] foo 2020 sig_send: Not waiting for sigcomplete. its_me 1 signal -34
96 43296 [main] foo 2020 sig_send: returning 0x0 from sending signal -34
192 43488 [main] foo 2020 fhandler_console::write: 12E2E0, 5
90 43578 [main] foo 2020 fhandler_console::write: at 50(2) state is 0
332 43910 [main] foo 2020 fhandler_console::write: 5 = write_console (,..5)
580 44490 [main] foo 2020 sig_send: sendsig 0x704, pid 2020, signal -34, its_me 1
99 44589 [main] foo 2020 sig_send: Not waiting for sigcomplete. its_me 1 signal -34
99 44688 [main] foo 2020 sig_send: returning 0x0 from sending signal -34
168 44856 [main] foo 2020 fhandler_console::write: 61101197, 1
83 44939 [main] foo 2020 fhandler_console::write: at 45(-) state is 0
263 45202 [main] foo 2020 fhandler_console::write: 1 = write_console (,..1)
--- Process 2020, exception C0000005 at 610EEABC
--- Process 2020, exception C0000005 at 00010007
--- Process 2020, exception C0000005 at 00010007
--- Process 2020, exception C0000005 at 00010007
--- Process 2020, exception C0000005 at 00010007
--- Process 2020, exception C0000005 at 00010007
--- Process 2020, exception C0000005 at 00010007
Any ideas?
Cheers,
Christian
--
________________________________________________________________________
http://www.icir.org/christian
http://www.whoop.org
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