Basic Functionality, allows these system calls:

• OpenBSD: sendto(2) is only permitted if its destination socket address is NULL. As a result, all the expected functionalities of libc stdio work. clock_getres(2), clock_gettime(2), close(2), closefrom(2), dup(2), dup2(2), dup3(2), fchdir(2), fcntl(2), fstat(2), fsync(2), ftruncate(2), getdtablecount(2), getegid(2), getentropy(2), geteuid(2), getgid(2), getgroups(2), getitimer(2), getlogin(2), getpgid(2), getpgrp(2), getpid(2), getppid(2), getresgid(2), getresuid(2), getrlimit(2), getrtable(2), getsid(2), getthrid(2), gettimeofday(2), getuid(2), issetugid(2), kevent(2), kqueue(2), kqueue1(2), lseek(2), madvise(2), minherit(2), mmap(2), mprotect(2), mquery(2), munmap(2), nanosleep(2), pipe(2), pipe2(2), poll(2), pread(2), preadv(2), profil(2), pwrite(2), pwritev(2), read(2), readv(2), recvfrom(2), recvmsg(2), select(2), sendmsg(2), sendsyslog(2), sendto(2), setitimer(2), shutdown(2), sigaction(2), sigprocmask(2), sigreturn(2), socketpair(2), umask(2), wait4(2), waitid(2), write(2), writev(2)

read from filesystem allows system calls:

• OpenBSD: which allow path traversal, reading struct stat, and opening files for read.

write to filesystem, allows system calls:

• OpenBSD: similar to ReadFromFilesystem, but files can be opened for write

create and remove on to filesystem, allows system calls:

• OpenBSD: similar to WriteToFilesystem, but files can be opened for write

special create and remove on to filesystem, allows system calls:

• OpenBSD: similar to CreateAndRemoveOnFilesystem, but special files can be created using: mkfifo(2), mknod(2)

networking allows the following system calls to operate in the AF_INET and AF_INET6 domain:

• OpenBSD: socket(2), listen(2), bind(2), connect(2), accept4(2), accept(2), getpeername(2), getsockname(2), setsockopt(2), getsockopt(2)

networking multicast in combination with Networking:

• OpenBSD: give back functionality to setsockopt(2) for operating on multicast sockets

file attribute modification allows the following system calls to make explicit changes to fields in struct stat relating to a file:

• OpenBSD: utimes(2), futimes(2), utimensat(2), futimens(2), chmod(2), fchmod(2), fchmodat(2), chflags(2), chflagsat(2), chown(2), fchownat(2), lchown(2), fchown(2), utimes(2)

change file ownership allows:

• OpenBSD: to change the user of group on a file, chown (2)

file locking allowed via:

• OpenBSD: fcntl(2), flock(2), lockf(3), and open(2). No distinction is made between shared and exclusive locks. This is required for unlock as well as lock.

unix allows the following system calls to operate in the AF_UNIX domain:

• OpenBSD: socket(2), listen(2), bind(2), connect(2), accept4(2), accept(2), getpeername(2), getsockname(2), setsockopt(2), getsockopt(2)

dns allows:

• OpenBSD: Some low-level behaviours required by the DNS resolver res_init(3) are permitted, such as opening resolv.conf(5) and a few networking system calls: socket(2), connect(2), sendto(2), recvfrom(2). To distinguish the dns promise from inet, the libc DNS code opens sockets with the SOCK_DNS flag which OpenBSD requires to communicate with AF_INET and AF_INET6 at port 53.

get password allows:

• OpenBSD: This allows read-only opening of files in /etc for the getpwnam(3), getgrnam(3), getgrouplist(3), and initgroups(3) family of functions, including lookups via the yp(8) protocol for YP and LDAP databases.

send file descriptors allows:

• OpenBSD: sending of file descriptors using sendmsg(2). File descriptors referring to directories may not be passed.

receiving file descriptors allows:

• OpenBSD: receiving of file descriptors using recvmsg(2). File descriptors referring to directories may not be passed.

tape drives allows:

• OpenBSD: MTIOCGET and MTIOCTOP operations against tape drives.

teletypewriter allows:

• OpenBSD: in addition to read-write operations on /dev/tty, this opens up a variety of ioctl(2) requests used by tty devices. If TTY is accompanied with ReadFromFilesystem, revoke(2) is permitted. Otherwise only the following ioctl(2) requests are permitted: TIOCSPGRP, TIOCGETA, TIOCGPGRP, TIOCGWINSZ, TIOCSWINSZ, TIOCSBRK, TIOCCDTR, TIOCSETA, TIOCSETAW, TIOCSETAF, TIOCUCNTL

process relation allows the following process relationship operations:

• OpenBSD: fork(2), vfork(2), kill(2), getpriority(2), setpriority(2), setrlimit(2), setpgid(2), setsid(2)

execute allows a process to call:

• OpenBSD: execve(2). Coupled with the ProcessRelation promise, this allows a process to fork and execute another program.

protection execute allows the use of:

• OpenBSD: PROT_EXEC with mmap(2) and mprotect(2).

settime allows the setting of the system time, via the:

• OpenBSD: settimeofday(2), adjtime(2), and adjfreq(2) system calls.

processes allows enough:

• OpenBSD: sysctl(2) interfaces to allow inspection of processes operating on the system using programs like ps(1).

virtual memory info allows enough:

• OpenBSD: sysctl(2) interfaces to allow inspection of the system's virtual memory by programs like top(1) and vmstat(8).

change rights of a process allows the following system calls which can change the rights of a process:

• OpenBSD: setuid(2), seteuid(2), setreuid(2), setresuid(2), setgid(2), setegid(2), setregid(2), setresgid(2), setgroups(2), setlogin(2), setrlimit(2), getpriority(2), setpriority(2), setrtable(2)

packet filtering allows:

• OpenBSD: a subset of ioctl(2) operations on the pf(4) device: DIOCADDRULE, DIOCGETSTATUS, DIOCNATLOOK, DIOCRADDTABLES, DIOCRCLRADDRS, DIOCRCLRTABLES, DIOCRCLRTSTATS, DIOCRGETTSTATS, DIOCRSETADDRS, DIOCXBEGIN, DIOCXCOMMIT

inspection of routing table allows inspection of the routing table:

• OpenBSD: .

change routing table allows changes to the routing table:

• OpenBSD: .

audio allows:

• OpenBSD: a subset of ioctl(2) operations on audio(4) devices (see sio_open(3) for more information): AUDIO_GETPOS, AUDIO_GETPAR, AUDIO_SETPAR, AUDIO_START, AUDIO_STOP, AUDIO_MIXER_DEVINFO, AUDIO_MIXER_READ, AUDIO_MIXER_WRITE

video allows:

• OpenBSD: a subset of ioctl(2) operations on video(4) devices: VIDIOC_DQBUF, VIDIOC_ENUM_FMT, VIDIOC_ENUM_FRAMEINTERVALS, VIDIOC_ENUM_FRAMESIZES, VIDIOC_G_CTRL, VIDIOC_G_PARM, VIDIOC_QBUF, VIDIOC_QUERYBUF, VIDIOC_QUERYCAP, VIDIOC_QUERYCTRL, VIDIOC_S_CTRL, VIDIOC_S_FMT, VIDIOC_S_PARM, VIDIOC_STREAMOFF, VIDIOC_STREAMON, VIDIOC_TRY_FMT, VIDIOC_REQBUFS

berkeley packet filtering allows BIOCGSTATS operation for statistics collection from a bpf(4) device.

• OpenBSD: .

error rather:

• OpenBSD: indicates error with ENOSYS than killing the process upon violation.