find caller

/* Jack 2020/08/12

*/

 #include <stdio.h>

#include <stdlib.h>

#define printf( format,arg...) \

        printf("call from %s\n", __func__);\

        printf( format, arg );

int main(){

    printf( "%s\n", "test" );

}

jack@i7-build-server:~$ ./a.out

call from main

test