Other UNIX® system interfaces, not in POSIX.1-2024, or deprecated:
_longjmp (SUSv4)
_setjmp (SUSv4)
_tolower (SUSv4)
_toupper (SUSv4)
acl_add_perm (POSIX.1e draft)
acl_calc_mask (POSIX.1e draft)
acl_check (libacl)
acl_clear_perms (POSIX.1e draft)
acl_cmp (libacl)
acl_copy_entry (POSIX.1e draft)
acl_copy_ext (POSIX.1e draft)
acl_copy_int (POSIX.1e draft)
acl_create_entry (POSIX.1e draft)
acl_delete_def_file (POSIX.1e draft)
acl_delete_entry (POSIX.1e draft)
acl_delete_perm (POSIX.1e draft)
acl_dup (POSIX.1e draft)
acl_entries (libacl)
acl_equiv_mode (libacl)
acl_error (POSIX.1e draft)
acl_extended_fd (libacl)
acl_extended_file (libacl)
acl_extended_file_nofollow (libacl)
acl_free (POSIX.1e draft)
acl_from_mode (libacl)
acl_from_text (POSIX.1e draft)
acl_get_entry (POSIX.1e draft)
acl_get_fd (POSIX.1e draft)
acl_get_fd_np (FreeBSD, NetBSD)
acl_get_file (POSIX.1e draft)
acl_get_link_np (FreeBSD, NetBSD)
acl_get_perm (libacl)
acl_get_perm_np (FreeBSD, NetBSD)
acl_get_permset (POSIX.1e draft)
acl_get_qualifier (POSIX.1e draft)
acl_get_tag_type (POSIX.1e draft)
acl_init (POSIX.1e draft)
acl_is_trivial_np (FreeBSD, NetBSD)
acl_set_fd (POSIX.1e draft)
acl_set_fd_np (FreeBSD, NetBSD)
acl_set_file (POSIX.1e draft)
acl_set_link_np (FreeBSD, NetBSD)
acl_set_permset (POSIX.1e draft)
acl_set_qualifier (POSIX.1e draft)
acl_set_tag_type (POSIX.1e draft)
acl_size (POSIX.1e draft)
acl_strip_np (FreeBSD, NetBSD)
acl_to_any_text (libacl)
acl_to_text (POSIX.1e draft)
acl_valid (POSIX.1e draft)
atoff (AIX)
bcmp (POSIX.1-2001, SUSv3)
bcopy (SUSv3)
bzero (SUSv3)
chroot (SUSv2 - see the section called “Implementation Notes”)
clock_setres (QNX, VxWorks - see the section called “Implementation Notes”)
cuserid (POSIX.1-1988, SUSv2)
ecvt (SUSv3)
endutent (XPG2)
fcvt (SUSv3)
ftime (SUSv3)
ftw (SUSv4)
gcvt (SUSv3)
getcontext (SUSv3)
gethostbyaddr (SUSv3)
gethostbyname (SUSv3)
gethostbyname2 (first defined in BIND 4.9.4)
getitimer (SUSv4 - see the section called “Implementation Notes”)
getpass (SUSv2)
gets (SUSv4)
gettimeofday (SUSv4)
getutent (XPG2)
getutid (XPG2)
getutline (XPG2)
getw (SVID)
getwd (SUSv3)
h_errno (SUSv3)
index (SUSv3)
ioctl (SUSv4)
isascii (SUSv4)
makecontext (SUSv3)
mallinfo (SVID)
mallopt (SVID)
mktemp (SUSv3)
on_exit (SunOS)
pthread_attr_getstackaddr (SUSv3)
pthread_attr_setstackaddr (SUSv3)
pthread_continue (XPG2)
pthread_getconcurrency (SUSv4)
pthread_getsequence_np (Tru64)
pthread_setconcurrency (SUSv4)
pthread_suspend (XPG2)
pthread_yield (POSIX.1c drafts)
pututline (XPG2)
putw (SVID)
rand_r (SUSv4)
rindex (SUSv3)
scalb (SUSv3)
setcontext (SUSv3)
setitimer (SUSv4 - see the section called “Implementation Notes”)
setpgrp (SUSv4)
setutent (XPG2)
sighold (SUSv4)
sigignore (SUSv4)
siginterrupt (SUSv4)
sigpause (SUSv4 - see the section called “Implementation Notes”)
sigrelse (SUSv4)
sigset (SUSv4)
stime (SVID)
swapcontext (SUSv3)
sys_errlist (BSD)
sys_nerr (BSD)
sys_siglist (BSD)
tempnam (SUSv4)
toascii (SUSv4)
ttyslot (SUSv2)
ualarm (SUSv3)
usleep (SUSv3)
utime (SUSv4)
utmpname (XPG2)
vfork (SUSv3 - see the section called “Implementation Notes”)