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#include <iostream>
using namespace std;
 
int fd;
int len;
void *ptr;
main() {
    int argc = *%rsp;
    char* arg1 = *(%rsp + 16);
    if(argc != 1) goto exit;
 
    fd = open(arg1, O_RDONLY, 0);
    len = lseek(fd, SEEK_END, 0);
    ptr = mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0);
    write(stdout, ptr, len);
    munmap(ptr, len);
    close(fd);
exit:
    exit(0);
}
 

prog.cpp: In function ‘int main()’:
prog.cpp:8:17: error: expected primary-expression before ‘%’ token
     int argc = *%rsp;
                 ^
prog.cpp:8:18: error: ‘rsp’ was not declared in this scope
     int argc = *%rsp;
                  ^~~
prog.cpp:9:20: error: expected primary-expression before ‘%’ token
     char* arg1 = *(%rsp + 16);
                    ^
prog.cpp:12:21: error: ‘O_RDONLY’ was not declared in this scope
     fd = open(arg1, O_RDONLY, 0);
                     ^~~~~~~~
prog.cpp:12:32: error: ‘open’ was not declared in this scope
     fd = open(arg1, O_RDONLY, 0);
                                ^
prog.cpp:13:32: error: ‘lseek’ was not declared in this scope
     len = lseek(fd, SEEK_END, 0);
                                ^
prog.cpp:14:27: error: ‘PROT_READ’ was not declared in this scope
     ptr = mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0);
                           ^~~~~~~~~
prog.cpp:14:38: error: ‘MAP_SHARED’ was not declared in this scope
     ptr = mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0);
                                      ^~~~~~~~~~
prog.cpp:14:55: error: ‘mmap’ was not declared in this scope
     ptr = mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0);
                                                       ^
prog.cpp:15:27: error: ‘write’ was not declared in this scope
     write(stdout, ptr, len);
                           ^
prog.cpp:16:20: error: ‘munmap’ was not declared in this scope
     munmap(ptr, len);
                    ^
prog.cpp:17:13: error: ‘close’ was not declared in this scope
     close(fd);
             ^

Standard output is empty