For my OS class I'm supposed to implement Linux's cat using only system calls (no printf)
Reading this reference I found it being used to print to a file. I guess I should manipulate ofstream.
In the example appears: ofstream outfile ("new.txt",ofstream::binary);
How can I make it write to the screen?
EDIT: I realized this write() is part of iostream library, is this the same as the int write (int fd, char *buf , int size) system call?
#define _GNU_SOURCE /* See feature_test_macros(7) */
#include <unistd.h> // For open, close, read, write, fsync
#include <sys/syscall.h> //For SYSCALL id __NR_xxx
//Method 1 : API
write(1,"Writing via API\n",\
strlen("Writing via API\n") );
fsync(1);
//Method 2 : Via syscall id
const char msg[] = "Hello World! via Syscall\n";
syscall(__NR_write, STDOUT_FILENO, msg, sizeof(msg)-1);
syscall(__NR_fsync, STDOUT_FILENO ); // fsync(STDOUT_FILENO);