C 동적 라이브러리

control_light.c

#include "control_light.h"
#include <stdio.h>

int turn_on(int id) {
        printf("turn on %d\n", id);

        return 0;
}

int turn_off(int id) {
        printf("turn off %d\n", id);

        return 0;
}
//
// gcc -fPIC -c control_light.c
// gcc -shared -Wl,-soname,libcontrollight.so.0 -o libcontrollight.so.0.0.0 control_light.o

// sudo cp libcontrollight.so.0.0.0 /usr/local/lib/
// sudo ln -s /usr/local/lib/libcontrollight.so.0.0.0 /usr/local/lib/libcontrollight.so.0
// sudo ln -s /usr/local/lib/libcontrollight.so.0.0.0 /usr/local/lib/libcontrollight.so

control_light.h

int turn_on(int id);
int turn_off(int id);

main.c

#include "control_light.h"

int main() {
        turn_on(13);
        turn_on(7);
        turn_off(13);
        turn_on(7);

        return 0;
}

// export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib/
// gcc main.c -L/usr/local/lib -lcontrollight