34 questions
0
votes
0
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19
views
Gluon and JNA/JNR [duplicate]
I used JNA with GLUON before and had no problems. Everything worked.
I tried replacing JNA with JNR.
When I run mvn gluonfx:runagent , JNR runs successfully.
However, after mvn clean gluonfx:build ...
0
votes
0
answers
176
views
java.lang.UnsatisfiedLinkError: could not load FFI provider jnr.ffi.provider.jffi.Provider
I am using docker and colima setup to run automation tests locally and encountering this error, that does not seem to start docker.
Error message:
java.lang.UnsatisfiedLinkError: could not load FFI ...
0
votes
0
answers
35
views
JNR-FFI - Callback Pointer crash
I'm using the Win 32 library. I'm trying to call a callback with a pointer.
But when called, the function does not complete, but causes an error.
Example of DLL initialization:
Csclink csc = ...
- 1
2
votes
1
answer
169
views
Why does Rust native library randomly crash when calling function?
In Rust, I have a function that compresses an array:
fn create_bitvec(data: Box<[u8]>) -> [u8; 49152] {
let mut bit_vector = [0u8; 49152];
for (index, &value) in data.iter()....
- 25
1
vote
2
answers
435
views
How can I call a function from JAVA/JNA if I only know the offset from another function?
I know that in libaaa.so there is an exported (the symbol is in the text/code section) function obj1() at address 0x12345 from the start of the library.
CLibrary libaaa = (CLibrary)Native.load("...
- 123
1
vote
0
answers
128
views
How to graceful shutdown in java with jnr-posix?
Java doesn't seem to have any default way of catching process signals. I found out the jnr-posix module that I am willing to use, and this is what I wrote so far
package org.projectsanatan.restsanatan;...
-1
votes
1
answer
236
views
How to handle a SIGSEGV with jffi / jnr?
The Java VM crash with a SIGSEGV in a docker container. On all other systems it is working as expected.
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=...
- 24.4k
2
votes
1
answer
7k
views
Could not load FFI provider when using module-info.java
My Linux Java application uses bluetooth devices. I use this library in order to communicate with bluez stack : https://github.com/hypfvieh/bluez-dbus.
It worked very well until I added module-info....
- 1,577
0
votes
2
answers
630
views
How to use defrecord in Clojure to extend a Java class?
From my research, the way to extend a Java class is basically with either gen-class in a namespace or with proxy. But looking at the Clojure type selection flowchart, it seems to suggest that I can ...
- 3,397
6
votes
1
answer
1k
views
How to copy native memory to DirectByteBuffer
I know one way - using memcpy on C++ side:
C++ method:
void CopyData(void* buffer, int size)
{
memcpy(buffer, source, size);
}
JNR mapping:
void CopyData(@Pinned @Out ByteBuffer byteBuffer, @...
- 704
3
votes
0
answers
381
views
How to return a struct by value using JNR?
I'm trying to work with the openh264 native library from Java code using JNR. The function I'm calling is defined in openh264's C header file to return a simple struct by value:
typedef struct ...
- 301
10
votes
1
answer
847
views
How to return by value from native function?
I have the following C++ method compiled using Visual Studio 2017:
extern "C" __declspec( dllexport )
Info* __stdcall GetInfo(InfoProvider* infoProvider)
{
static_assert(std::is_pod<Info>::...
- 704
6
votes
1
answer
315
views
how to specify a JNR Pointer like that of python ctypes
Using python's ctypes, it's possible to specify a pointer that takes a type:
class METADATA(Structure):
_fields_ = [("classes", c_int),
("names", POINTER(c_char_p))]
With JNR, it ...
- 14.2k
2
votes
0
answers
305
views
jnr-ffi Mapping to C Libray Crashes when calling c function
I have a key value database which is written in C with following functions to set and get values.
typedef uint64_t ARK;
#define ARC ARK
int ark_set(ARK *ark, uint64_t klen, void *key, uint64_t vlen, ...
- 116
1
vote
0
answers
674
views
Read from unix socket file
I'm trying to read some lines (or just something) from /var/run/docker.sock.
Basically I'm trying to convert the following into code.
curl --unix-socket /var/run/docker.sock http://localhost/events
...
- 4,565
0
votes
1
answer
344
views
Packet.dll get mac address (JNR-FFI)
How does one map the function below to java with jnr-ffi?
BOOLEAN PacketRequest(LPADAPTER AdapterObject,BOOLEAN Set,PPACKET_OID_DATA OidData);
Example (C): https://github.com/patmarion/winpcap/...
1
vote
1
answer
982
views
How can I force the usage of a class from a particular jar and exclude same class of another jar in build.sbt?
I have two asm dependencies that have exactly the same class names and project structures included by different dependencies. Although these libraries have the same project structure, they have ...
user5067524
3
votes
0
answers
1k
views
Cannsandra Driver & jnr-Unixsocket - java.lang.UnsatisfiedLinkError: could not load FFI provider jnr.ffi.provider.jffi.Provider
I am using cassandra and jnr-unix socket in my project and both uses jnr-ffi. Not getting any error in my local, but getting error in test env.
The versions are,
Cassandra version - 3.3.2
jnr-...
- 8,968
2
votes
1
answer
863
views
JNR-FFI how to read array of structs from pointer to pointer
I am trying to interface with a C library libzbc using jnr-ffi.
There is a function:
int zbc_list_zones ( struct zbc_device * dev, uint64_t sector, enum
zbc_reporting_options ro, ...
- 403
1
vote
1
answer
568
views
JNR-FFI crash after calling c function copying struct
I am trying to interface with a C library libzbc using jnr-ffi.
The first function call zbc_open works and returns a pointer to a open device. Then the next call to zbc_get_device_info causes a JVM ...
- 403
14
votes
2
answers
7k
views
What is the difference between JNA and JNR
According to the image from here
both libraries work according to the same principle. But I believe that there is a difference between them. What is this difference?
user5182503
0
votes
1
answer
659
views
JNR UnsatisfiedLinkError
This question might be related to this and a ton other UnsatisfiedLinkError questions.
I'm trying to run the following code.
import jnr.ffi.LibraryLoader;
import jnr.ffi.types.pid_t;
/**
* Gets ...
- 5,040
1
vote
1
answer
228
views
How to get UID and GID in jnrfuse
I am implementing filesytem using fuse and jnrfuse.Can someone tell me how to get the UID and GID info in jnrfuse?
- 57
1
vote
2
answers
488
views
jnr-ffi: Is there a generation tool from header files to java code
Is there a tool that generates java code from header files for the project jnr-ffi. I what to offer an API for a C-project with approx. 1200 functions.
- 1,547
1
vote
3
answers
3k
views
How to use a struct with a struct in jnr ffi
I have the following c code:
#include <stdio.h>
struct Second {
int a_number;
};
struct Top {
struct Second second;
};
void lets_go(struct Top *top) {
printf("The number is %d\n",...
- 10.8k
0
votes
1
answer
282
views
__stdcall with JNR
I'm using JNR and trying to call to __stdcall function. I've already tried to load library with stdcall() convention:
mTemplateApi = LibraryLoader.create(FPTemplateAPI.class).stdcall().load("...
- 107
2
votes
2
answers
2k
views
UnsatisifedLinkedError : Could not locate stub library in jar file
I am trying to use this jnr-jffi library. It appears to have a dependency on jffi so I have also built that and included in my libs folder.
My code to load the native code is as follows:
MATH_LIB = ...
- 9,098
1
vote
1
answer
480
views
Fuse filesystem in java - JVM error double free or corruption
I'm writing a Fuse-Filesystem in java using the jnr-fuse library (https://github.com/SerCeMan/jnr-fuse) which internally uses JNR for native access.
The filesystem works as a frontend to an Amazon S3 ...
2
votes
1
answer
4k
views
App running under SBT doesn't find a class from Classpath jar
I have a Scala project using sbt. It runs perfectly well under Eclipse, however, trying to run it under sbt (sbt 'run mount 1440' — including the parameters I need) leads to a ...
- 25
1
vote
1
answer
267
views
Extract process environment before exit from java-initiated command line command or shell script
I would like to read/dump the environment variables of a process (.sh file, command line invocation, etc) that I initiate from inside java.
For example, I have a shell script that runs and sets an ...
3
votes
0
answers
198
views
How to map a C-struct with bitfields in JNR?
I have the following struct that i want to map using JNR-FFI. Note that this struct contains bitfields. Unfortunatly there is no JavaDoc or any other kind of doc available.
typedef struct _DCB {
...
- 5,609
2
votes
0
answers
116
views
JNA equivalent of JNR's ObjectReferenceManager?
JNR has this thing called the ObjectReferenceManager that makes keeping track of references really convenient. An object is passed to it and a unique id (a Pointer, but it's really just an id afaik) ...
- 5,370
5
votes
2
answers
1k
views
Callback/closure with JNR taking a pointer argument
I'm using JNR and trying to pass a callback function with the following C-equivalent signature:
int fn(void const*, void const**, void**)
into some C function. I have declared the callback nested in ...
- 5,370
1
vote
1
answer
485
views
how to use java jnr to infer a clib struct
Is there a way for jnr to construct a struct for me in order to access a returned call using jnr.
for example, if I wanted to use
int statvfs(const char *path, struct statvfs *buf);
where struct ...
- 14.2k