getting syscall table address

static char mapfile[ ] = "/boot/System.map-";
static char query[ ] = "sys_call_table";

char *GetFile() {
 static char *filename;
 int fns;
 struct utsname info_s;

    if (uname(&info_s)>=0){
        fns=strlen(mapfile)+strlen(info_s.release);
        filename=(char *)malloc(fns);
        sprintf(filename,"%s%s",mapfile,info_s.release);
    } else return NULL;
 return filename;
}

unsigned long position(char *file) {
 FILE *fp;
 char buf[100];
 unsigned long *sctable;

    fp = fopen(file,"r");
    if (!fp) return 0;
    for(;;) {
        if(NULL == fgets(buf,99,fp)) break;
        if(strstr(buf,query)) {
            sctable=(unsigned long*)strtoul(strtok(buf," "),NULL,16);
            break;
        }
    }
    fclose(fp);
 return sctable;
}

int main() {
 char *filename=NULL;
 unsigned long sctaddr;

    filename=GetFile();
    sctaddr=position(filename);
    printf("[*] Syscall Table hosted at: %x\n",sctaddr);
 return 0;
}