a simple example of using syscall()

syscall_example

#include <stdio.h>
#include <fcntl.h>

/*arguments of syscall can be found on http://blog.rchapman.org/post/36801038863/linux-system-call-table-for-x86-64*/
int main(int argc, char* argv[]){
  const char* fileName[7] = "me.txt";
  //create a file that the owner can read/write. flags can be found easily by google
  syscall(SYS_open,fileName,O_CREAT,S_IRUSR|S_IWUSR);
  //open it as write only
  int fd = syscall(SYS_open,fileName,O_WRONLY);
  //write somehing
  syscall(SYS_write,fd,"hello",5);
  //close the file
  syscall(SYS_close,fd);
  //change permission to executable
  syscall(SYS_fchmod,fd,S_IXUSR);
}