ptrace_read_write.c

#include <stdio.h>
#include <sys/ptrace.h>
#include <unistd.h>

int main(void)
{
    printf("Ptrace\n");
    int pid;
    printf("please input pid:");
    scanf("%d",&pid);

    long address;
    printf("please input address:");
    scanf("%lX",&address);

    long ret= ptrace(PTRACE_ATTACH,pid,NULL,NULL);
    printf("PTRACE_ATTACH:%d\n",ret);

    if(ret!=0){
        printf("PTRACE_ATTACH ERROR\n");
        return 1;
    }

    sleep(1);

    //write memory
    int data;
    printf("please input data you want:");
    scanf("%d",&data);
    ptrace(PTRACE_POKEDATA,pid,address,data);
    printf("PTRACE_POKEDATA:%d\n",ret);

    sleep(1);

    //read memory
    printf("%lX:",address);
    int num=40;
    for (int i = 0; i < num; i++) {
        ret= ptrace(PTRACE_PEEKDATA,pid,address,NULL);
        printf("%d\t",ret);
        address+=0x4;
        if((i+1)%4==0){
            printf("\n");
            if(i!=(num-1)){
                printf("%lX:",address);
            }
        }
    }


    ret= ptrace(PTRACE_DETACH,pid,NULL,NULL);
    printf("PTRACE_DETACH:%d\n",ret);
    return 0;
}