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mingw: add a helper function to attach GDB to the current process
When debugging Git, the criss-cross spawning of processes can make things quite a bit difficult, especially when a Unix shell script is thrown in the mix that calls a `git.exe` that then segfaults. To help debugging such things, we introduce the `open_in_gdb()` function which can be called at a code location where the segfault happens (or as close as one can get); This will open a new MinTTY window with a GDB that already attached to the current process. Inspired by Derrick Stolee. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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@ -13,6 +13,19 @@
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static const int delay[] = { 0, 1, 10, 20, 40 };
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void open_in_gdb(void)
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{
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static struct child_process cp = CHILD_PROCESS_INIT;
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extern char *_pgmptr;
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argv_array_pushl(&cp.args, "mintty", "gdb", NULL);
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argv_array_pushf(&cp.args, "--pid=%d", getpid());
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cp.clean_on_exit = 1;
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if (start_command(&cp) < 0)
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die_errno("Could not start gdb");
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sleep(1);
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}
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int err_win_to_posix(DWORD winerr)
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{
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int error = ENOSYS;
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@ -591,6 +591,16 @@ extern CRITICAL_SECTION pinfo_cs;
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int wmain(int argc, const wchar_t **w_argv);
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int main(int argc, const char **argv);
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/*
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* For debugging: if a problem occurs, say, in a Git process that is spawned
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* from another Git process which in turn is spawned from yet another Git
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* process, it can be quite daunting to figure out what is going on.
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*
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* Call this function to open a new MinTTY (this assumes you are in Git for
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* Windows' SDK) with a GDB that attaches to the current process right away.
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*/
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extern void open_in_gdb(void);
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/*
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* Used by Pthread API implementation for Windows
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*/
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