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How to create a shared object using C progam on Linux machine?

+2 votes
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Please share a sample program with detail code.

posted Nov 1, 2013 by anonymous

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1 Answer

+2 votes

A dynamic library (shared library) can be linked with an executable at runtime.
The code of a shared library is loaded into physical memory once and can be reused by multiple processes

Extension used for dynamic libraries is .so

Creation of dynamic libraries is done using the –shared switch with gcc

Important options of the gcc command:
shared : produce a shared object which can then be linked with other objects to form an executable
fpic: generate position-independent code (PIC) suitable for use in a shared library

a.out: libsample.so program.o
gcc –L. program.o –lsample

program.o: program.c
gcc –c program.c

libsample.so: a.o b.o
gcc –shared –o libsample.so a.o b.o

a.o: a.c
gcc –fpic –c a.c
b.o: b.c
gcc –fpic –c b.c

answer Nov 1, 2013 by Vikas Upadhyay
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+5 votes

Even I have similar problem:

int (*pfun)(void);
int *pInt = 0;
void fun1()
{
    int i = 5; /* Local to fun1*/

    printf("Outer function");
    pInt = &i; /* As I know address of local variable is valid till function execution */

    int fun2()
    {
      printf("innerfunction");
      printf("%d", *pInt);
    }
    /* fun2 address assign to pfun so that It can be called even after completion of fun1 */
    pfun = fun2;
}

int main()
{
    fun1();
    pfun();
    return 0;
}

Can someone please explain ? I am getting *pInt value 5.

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