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| author |  Johannes Schindelin <johannes.schindelin@gmx.de> | 2020-02-13 21:49:53 +0000 |
|---|---|---|
| committer |  Junio C Hamano <gitster@pobox.com> | 2020-02-14 10:02:07 -0800 |
| commit | 08809c09aa1351b603e9c55734105cd2e3c24c41 (patch) | |
| tree | 8484465b2e13ac0d8a71dce4a128b7d824d84971 /compat | |
| parent | msvc: accommodate for vcpkg's upgrade to OpenSSL v1.1.x (diff) | |
| download | tgif-08809c09aa1351b603e9c55734105cd2e3c24c41.tar.xz | |
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>
Diffstat (limited to 'compat')
| -rw-r--r-- | compat/mingw.c | 13 | ||||
| -rw-r--r-- | compat/mingw.h | 10 |
2 files changed, 23 insertions, 0 deletions
diff --git a/compat/mingw.c b/compat/mingw.c index bd24d913f9..6b36d0387a 100644 --- a/compat/mingw.c +++ b/compat/mingw.c @@ -13,6 +13,19 @@ static const int delay[] = { 0, 1, 10, 20, 40 }; +void open_in_gdb(void) +{ + static struct child_process cp = CHILD_PROCESS_INIT; + extern char *_pgmptr; + + argv_array_pushl(&cp.args, "mintty", "gdb", NULL); + argv_array_pushf(&cp.args, "--pid=%d", getpid()); + cp.clean_on_exit = 1; + if (start_command(&cp) < 0) + die_errno("Could not start gdb"); + sleep(1); +} + int err_win_to_posix(DWORD winerr) { int error = ENOSYS; diff --git a/compat/mingw.h b/compat/mingw.h index 04ca731a6b..88c07c4520 100644 --- a/compat/mingw.h +++ b/compat/mingw.h @@ -592,6 +592,16 @@ int wmain(int argc, const wchar_t **w_argv); int main(int argc, const char **argv); /* + * For debugging: if a problem occurs, say, in a Git process that is spawned + * from another Git process which in turn is spawned from yet another Git + * process, it can be quite daunting to figure out what is going on. + * + * Call this function to open a new MinTTY (this assumes you are in Git for + * Windows' SDK) with a GDB that attaches to the current process right away. + */ +extern void open_in_gdb(void); + +/* * Used by Pthread API implementation for Windows */ int err_win_to_posix(DWORD winerr); |