posix_kill
posix_getpid
posix_getppid
posix_getuid
posix_setuid
posix_geteuid
posix_seteuid
posix_getgid
posix_setgid
posix_getegid
posix_setegid
posix_getgroups
posix_getlogin
posix_getpgrp
posix_setsid
posix_setpgid
posix_getpgid
posix_getsid

posix_uname
posix_times
posix_ctermid
posix_ttyname
posix_isatty
posix_getcwd
posix_mkfifo
posix_mknod
posix_access
posix_getgrnam
posix_getgrgid
posix_getpwnam
posix_getpwuid
posix_getrlimit
posix_get_last_error
posix_errno
posix_strerror