hmm [c sistem-programlama]

ex.c

#include "apue.h"

#define BUFFSIZE 4096

int main(void) {
	int n;
	char buf[BUFFSIZE];

	while ((n = read(STDIN_FILENO, buf, BUFFSIZE)) > 0)
		if (write(STDOUT_FILENO, buf, n) != n)
			err_sys("write error");
		if (n < 0)
			err_sys("read error");

		return 0;
}