shichao-an/apue_truncate.h

## apue_truncate.h
#include <unistd.h>

int truncate(const char *pathname, off_t length);
int ftruncate(int fd, off_t length);

/* Both return: 0 if OK, −1 on error */
	#include <unistd.h>

	int truncate(const char *pathname, off_t length);
	int ftruncate(int fd, off_t length);

	/* Both return: 0 if OK, −1 on error */