mkstemp (a secure one!)
pread
pwrite
+chown
getpass
readline (the library)
inet_ntoa
freeifaddrs
utime
utimes
+link
+readlink
Types:
bool
uint{8,16,32,64}_t
int{8,16,32,64}_t
intptr_t
+sig_atomic_t
Constants:
PATH_NAME_MAX
stdint.h
stdbool.h
+Optional C keywords:
+volatile
+
Prerequisites:
memset (for bzero)
syslog (for vsyslog)