nftw() nl_langinfo() ptsname() putc_unlocked() putchar_unlocked() putenv() pututxline() rand() readdir() setenv() setgrent() setkey ... rwlock_wrlock() putc() putc_unlocked() putch…getc_unlocked () getchar_unlocked () putc_unlocked () putchar_unlocked () rand_r () strerror_r () strtok_r () asctime