SEGFAULT when converting C string to string
DFTW
jckj33 at gmail.com
Mon Mar 18 22:20:35 UTC 2019
I'm writing a shared library in C to be used from a C program, so
I went to my small tests. That one failed give a SEGFAULT on the
std.conv.to call.
This is the pice of D code/the library:
extern(C) int foo(const char *name, int age)
{
import core.stdc.stdio : printf;
import core.stdc.stdlib;
import std.conv : to;
printf("printf() got called! age = %d\n", age);
printf("name = [%s]\n", name);
//auto nm = to!string(name); // <-- everything works until I
uncomment this line.
return age * 2;
}
if matters, compiled with dub: "targetType" : "dynamicLibrary"
on 64-bit machine.
This is the piece of C code, foo.c:
#include <stdio.h>
#include <stdlib.h>
#include <dlfcn.h>
int main(void)
{
printf("+main();\n");
const char* libpath = "mylib.so";
void *lh = dlopen(libpath, RTLD_LAZY);
if(!lh) {
fprintf(stderr, "dlopen error: %s\n", dlerror());
return EXIT_FAILURE;
}
int (*fn)(const char*, int) = dlsym(lh, "foo");
char *err = dlerror();
if(err) {
fprintf(stderr, "dlsym error: %s\n", err);
return EXIT_FAILURE;
}
const char *name = "jhon";
int age = 18;
int result = (*fn)(name, age);
printf("unloading lib");
dlclose(lh);
printf("result = %d\n", result);
printf("-main()\n");
return 0;
}
compile as:
gcc foo.c -ldl
My OS is Ubuntu version 18
I'm assuming const char* both in C and D are raw pointers.
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