System interfaces compatible with BSD functions:

    __b64_ntop
    __b64_pton
    arc4random
    arc4random_addrandom
    arc4random_buf
    arc4random_stir
    arc4random_uniform
    bindresvport
    bindresvport_sa
    cfmakeraw
    cfsetspeed
    daemon
    dn_comp
    dn_expand
    dn_skipname
    drem
    eaccess
    endusershell
    err
    errx
    finite
    finitef
    fiprintf
    flock			(see chapter "Implementation Notes")
    forkpty
    fpurge
    freeifaddrs
    fstatfs
    fts_children
    fts_close
    fts_get_clientptr
    fts_get_stream
    fts_open
    fts_read
    fts_set
    fts_set_clientptr
    funopen
    futimes
    gamma
    gamma_r
    gammaf
    gammaf_r
    getdtablesize
    getgrouplist
    getifaddrs
    getpagesize
    getpeereid
    getprogname
    getusershell
    herror
    hstrerror
    inet_aton
    inet_makeaddr
    inet_netof
    inet_network
    initgroups
    iruserok
    iruserok_sa
    login
    login_tty
    logout
    logwtmp
    madvise
    mkstemps
    openpty
    rcmd
    rcmd_af
    reallocf
    res_close
    res_init
    res_mkquery
    res_nclose
    res_ninit
    res_nmkquery
    res_nquery
    res_nquerydomain
    res_nsearch
    res_nsend
    res_query
    res_querydomain
    res_search
    res_send
    revoke
    rexec
    rresvport
    rresvport_af
    ruserok
    sbrk
    setbuffer
    setgroups
    setlinebuf
    setpassent
    setprogname
    settimeofday
    setusershell
    statfs
    strcasestr
    strlcat
    strlcpy
    strsep
    updwtmp
    valloc
    verr
    verrx
    vhangup			(see chapter "Implementation Notes")
    vsyslog
    vwarn
    vwarnx
    wait3
    wait4
    warn
    warnx
    wcslcat
    wcslcpy