ref: 56f48a1788a3d7e1e6ee53d58f4849c6b9b3a01c dir: /include/bits/linux/sys/stdio.h/
#define BUFSIZ 512 #define FILENAME_MAX 256 #define FOPEN_MAX 16 #define TMP_MAX 25 #define L_tmpnam 256 #define _TMPNAME "/tmp/tmp.0000000"