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View Code? Open in Web Editor NEWFFI for kdb+
Home Page: https://code.kx.com/q/interfaces
License: Apache License 2.0
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abalkin sv fintanq chenkangcrack smitton pyzh py361 stjordanis mshimizu-kx flyingoe seanpm2001 meerkatsmanffi's Issues
Accessing the K Object length
extern "C" void g(void* ptr)
{
printf("%s: (%p)\n", PRETTY_FUNCTION, ptr);
K k = static_cast(ptr);
printf("k = %p\n", k);
printf("%p->t = %d\n", k, k->t);
printf("%p->n = %lld\n", k, k->n);
printf("---\n");
q)g[enlist ([]til 10)]
void g(void*): (0x7f7929901bd0)
k = 0x7f7929901bd0
0x7f7929901bd0->t = 98
0x7f7929901bd0->n = 140158365392032
For some reason n is coming as some nonsensical number. The type t is correct. I would expect n to be 10 or 1 if it is the number of columns.
Is there a way of passing the raw k object using ffi?
Errors building without setting various cmake options
I had some troubles building this library, and with help from Simon managed to get it built by adding the below to CMakeLists.txt. This should probably be included by default when I clone the repo.
set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c99 -D_GNU_SOURCE")
Is it possible to call a function like execve?
I'm having a pickle of a time trying to call execve. I can't for the life of me figure out the right way to construct and pass the argv and envp arguments to the function so that they are arrays of pointers.
Is this possible? How are you supposed to build the array of character pointers?
Segfault error when calling bound function twice
Hi,
Whenever the q function bound to isConnected() function from this c++ project is called for the second time, q crashes with segmentation fault error:
$ q
KDB+ 3.6 2018.06.14 Copyright (C) 1993-2018 Kx Systems
l64/ 16(16)core 64537MB dk s110519 208.110.70.170 EXPIRE 2019.11.06 daniel.krizian@gmail.com KOD #4162453
q)\l ffi.q;
q)lib:{`qib.0.0.1.so,x};
q)bind:{[f;a;r] '[.ffi.bind[ lib f;a;r],[;::]::;enlist]};
q)isConnected:bind[ ;"";"b"] `$"_ZNK7EClient11isConnectedEv";
q)isConnected[]
0b
q)isConnected[]
Sorry, this application or an associated library has encountered a fatal error and will exit.
If known, please email the steps to reproduce this error to tech@kx.com
with a copy of the kdb+ startup banner and the info printed below.
Thank you.
SIGSEGV: Fault address 0x40
/opt/conda/envs/q/q/l64/q() [0x48483b]
/lib/x86_64-linux-gnu/libpthread.so.0(+0xf890) [0x7f1a752a9890]
/usr/lib/qib.0.0.1.so(_ZNK7EClient11isConnectedEv+0) [0x7f1a75fa1400]
/opt/conda/envs/q/q/l64/../../lib/libffi.so.6(ffi_call_unix64+0x4c) [0x7f1a6e949ec0]
/opt/conda/envs/q/q/l64/../../lib/libffi.so.6(ffi_call+0x22d) [0x7f1a6e94987d]
/opt/conda/envs/q/q/l64/ffi.so(call+0x296) [0x7f1a6eb4ef67]
/opt/conda/envs/q/q/l64/q() [0x483bf9]
/opt/conda/envs/q/q/l64/q() [0x4441a6]
/opt/conda/envs/q/q/l64/q() [0x444185]
/opt/conda/envs/q/q/l64/q() [0x4445d5]
/opt/conda/envs/q/q/l64/q() [0x41da94]
/opt/conda/envs/q/q/l64/q() [0x443eee]
/opt/conda/envs/q/q/l64/q() [0x4445d5]
/opt/conda/envs/q/q/l64/q() [0x41da94]
/opt/conda/envs/q/q/l64/q() [0x443eee]
/opt/conda/envs/q/bin/q: line 3: 22054 Segmentation fault numactl --physcpubind=0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15 $QHOME/l64/q "$@"qib.0.0.1.so library is compiled from this source (https://github.com/danielkrizian/qib/), which is latest version of the Interactive Brokers TWS API.
Note: _ZNK7EClient11isConnectedEv is mangled c++ symbol of the function EClient::isConnected():
$ nm /usr/lib/qib.0.0.1.so | c++filt | grep isConnected
0000000000017400 T EClient::isConnected() const
$ nm /usr/lib/qib.0.0.1.so | grep _ZNK7EClient11isConnectedEv
0000000000017400 T _ZNK7EClient11isConnectedEvCompilation details
Snippet from my CMakeCache.txt :
//CXX compiler
CMAKE_CXX_COMPILER:FILEPATH=/opt/conda/envs/q/bin/x86_64-conda_cos6-linux-gnu-c++
//Flags used by the CXX compiler during all build types.
CMAKE_CXX_FLAGS:STRING=-fvisibility-inlines-hidden -std=c++17 -fmessage-length=0 -march=nocona -mtune=haswell -ftree-vectorize -fPIC -fstack-protector-strong -fno-plt -O2 -ffunction-sections -pipe
//C compiler
CMAKE_C_COMPILER:FILEPATH=/opt/conda/envs/q/bin/x86_64-conda_cos6-linux-gnu-cc
//Flags used by the C compiler during all build types.
CMAKE_C_FLAGS:STRING=-march=nocona -mtune=haswell -ftree-vectorize -fPIC -fstack-protector-strong -fno-plt -O2 -ffunction-sections -pipe
//Flags used by the linker during all build types.
CMAKE_EXE_LINKER_FLAGS:STRING=-Wl,-O2 -Wl,--sort-common -Wl,--as-needed -Wl,-z,relro -Wl,-z,now -Wl,--disable-new-dtags -Wl,--gc-sections
//Flags used by the linker during the creation of shared libraries
// during all build types.
CMAKE_SHARED_LINKER_FLAGS:STRING=-Wl,-O2 -Wl,--sort-common -Wl,--as-needed -Wl,-z,relro -Wl,-z,now -Wl,--disable-new-dtags -Wl,--gc-sections
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