On 02/11/2023 18:21, Roland Mainz via Cygwin wrote:
We're trying to debug mysterious sporadic I/O issues in Windows native
git ('/cygdrive/c/Program Files/Git/cmd/git') started from Cygwin
3.5.0 mintty.exe ...
... which raises the question:
How can I watch the Windows syscalls for file open/read/write/close
with Cygwin strace for a new process and all its process and thread
children ?
I tried many combinations of --mask=xyz, -etc, but still do not see
any I/O happening...
strace is not the tool for the job here.
As 'man strace' says: "The strace program executes a program [...]
reporting any Cygwin DLL output from the program(s) to stdout"
(So strace just shows some general "debugging output" from inside the
Cygwin DLL. It perhaps should try to act a bit more like a real strace
on UNIX, reporting all the emulated syscalls and their results, but that
would require explicit annotation of all of those points inside the
cygwin DLL.)
In any case, it isn't a tool for tracing native Windows programs. I
suggest you use procmon, or some other similar native tool.
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