Template for running C code in Google Colab

colabCTemplate.py

prog = """ 
#include <stdio.h>
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h> 
#include <unistd.h>

  int main() {
  size_t buf_size = 1 << 18; // 256KiB
  char* buf = (char*) malloc(buf_size);
  memset((void*)buf, 'X', buf_size); // output Xs
  while (1) {
    size_t remaining = buf_size;
    while (remaining > 0) {
      // Keep invoking `write` until we've written the entirety
      // of the buffer. Remember that write returns how much
      // it could write into the destination -- in this case,
      // our pipe.
      ssize_t written = write(
        STDOUT_FILENO, buf + (buf_size - remaining), remaining
      );
      remaining -= written;
    }
  }
} """

text_file = open("fiz.c", "w")
n = text_file.write(prog)
text_file.close()
!ls
!clang fiz.c -O3 -o fiz.out