How to set the file length?

呃勒婆斯

I have a file that is 100 bytes long and I want to change it to 50 bytes in length.

killerss

ftruncate

orangedj

#include <unistd.h>
#include <sys / types.h>

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