The functions and macros in the C library are described here in alphabetical order.
A ¦ B ¦ C ¦ D ¦ E ¦ F ¦ G ¦ H ¦ I ¦ J ¦ K ¦ L ¦ M ¦ N ¦ O ¦ P ¦ Q ¦ R ¦ S ¦ T ¦ U ¦ V ¦ W ¦ X ¦ Y ¦ Z
ualarm()
UDP
ultoa()
ulltoa()
umask()
umount()
UNALIGNED_PUT16()
UNALIGNED_PUT32()
UNALIGNED_PUT64()
UNALIGNED_RET16()
UNALIGNED_RET32()
UNALIGNED_RET64()
uname()
ungetc()
ungetwc()
UNIX
unlink()
unsetenv()
usleep()
utime()
utimes()
utmp
utmpname()
utoa()
A ¦ B ¦ C ¦ D ¦ E ¦ F ¦ G ¦ H ¦ I ¦ J ¦ K ¦ L ¦ M ¦ N ¦ O ¦ P ¦ Q ¦ R ¦ S ¦ T ¦ U ¦ V ¦ W ¦ X ¦ Y ¦ Z