Sectcreate

build.sh

gcc -Os main.c -sectcreate __TEXT example example.txt

example.txt

Hello, world.

main.c

#include <stdio.h>
#include <mach-o/getsect.h>

int main(void) {
  size_t size;
  size_t slide = _dyld_get_image_vmaddr_slide(0);
  const char *data = getsectdata("__TEXT", "example", &size);
  printf("%.*s", (int) size, data + slide);
  return 0;
}