Advanced Programming in the UNIX Environment 책 start!!! ◆ open#includeint open(const char *pathname, int oflag, .... /*mode_t mode*/);(ret) success : file descriptor failed : -1 ◆ creat#includeint creat(const char *pathname, mode_t mode);(ret) success : file descriptor (WRONLY) failed : -1 ◆ close#includeint close(int filedes);(ret) success : 0 faile : -1 ◆ lseek#includeint lseek(int filedes, of..