nlist function always returns -1

Question

I made exe file (d.out) by compiling another program. And nlist function always returns -1. fopen func returns !=null. If it matters i compile my prog like this gcc -I/usr/include main.c -L/usr/lib/i386-linux-gnu/pkgconfig -lbsd

#include <string.h>
#include <bsd/nlist.h>
#include  <stdio.h>
#include <stdlib.h>

int test(){
    struct nlist nl[2];
    memset(&nl, 0, sizeof(nl));
    return  nlist("d.out", nl);
//  return nl[0].n_value;
}

int main(){


printf("%d \n", test());

}

score 0 · Answer 1 · answered Feb 24 '17 at 22:39

0

My FreeBSD man page says:

RETURN VALUES
The number of invalid entries is returned if successful; otherwise, if the file filename does not exist or is not executable, the returned value is -1.

Does d.out exist?

answered Feb 24 '17 at 22:39

Jens

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ofcourse it exists. I tried to fopen it and it returns !=NULL . – Arseniy Ermilov Feb 25 '17 at 08:27
@ArseniyErmilov And of course the x bits aren't missing? And `file d.out` says it is an executable? – Jens Feb 25 '17 at 20:53
`d.out: ELF 32-bit LSB executable ...` `-rwxrwxrwx 1 username ... ` – Arseniy Ermilov Feb 25 '17 at 21:41
I run it gdb. And at some moment in func nlist gdb prints : `_dl_runtime_resolve () at ../sysdeps/i386/dl-trampoline.S:35 ../sysdeps/i386/dl-trampoline.S: No such file or catalog` . Maybe it doesnt work because of this ? – Arseniy Ermilov Feb 27 '17 at 20:23

nlist function always returns -1

1 Answers1