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@(#)a.t 8.1 (Berkeley) 6/8/93

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Kernel primitives

.h 1.1. "Process naming and protection

sethostid set UNIX host id

gethostid get UNIX host id

sethostname set UNIX host name

gethostname get UNIX host name

getpid get process id

fork create new process

exit terminate a process

execve execute a different process

getuid get user id

geteuid get effective user id

setreuid set real and effective user id's

getgid get accounting group id

getegid get effective accounting group id

getgroups get access group set

setregid set real and effective group id's

setgroups set access group set

getpgrp get process group

setpgrp set process group

.h 1.2 "Memory management

<sys/mman.h> memory management definitions

sbrk change data section size

sstk\(dg change stack section size

getpagesize get memory page size

mmap\(dg map pages of memory

msync\(dg flush modified mapped pages to filesystem

munmap\(dg unmap memory

mprotect\(dg change protection of pages

madvise\(dg give memory management advice

mincore\(dg determine core residency of pages

msleep\(dg sleep on a lock

mwakeup\(dg wakeup process sleeping on a lock

.FS \(dg Not supported in 4.3BSD. .FE .h 1.3 "Signals

<signal.h> signal definitions

sigvec set handler for signal

kill send signal to process

killpgrp send signal to process group

sigblock block set of signals

sigsetmask restore set of blocked signals

sigpause wait for signals

sigstack set software stack for signals

.h 1.4 "Timing and statistics

<sys/time.h> time-related definitions

gettimeofday get current time and timezone

settimeofday set current time and timezone

getitimer read an interval timer

setitimer get and set an interval timer

profil profile process

.h 1.5 "Descriptors

getdtablesize descriptor reference table size

dup duplicate descriptor

dup2 duplicate to specified index

close close descriptor

select multiplex input/output

fcntl control descriptor options

wrap\(dg wrap descriptor with protocol

.FS \(dg Not supported in 4.3BSD. .FE .h 1.6 "Resource controls

<sys/resource.h> resource-related definitions

getpriority get process priority

setpriority set process priority

getrusage get resource usage

getrlimit get resource limitations

setrlimit set resource limitations

.h 1.7 "System operation support

mount mount a device file system

swapon add a swap device

umount umount a file system

sync flush system caches

reboot reboot a machine

acct specify accounting file

System facilities

.h 2.1 "Generic operations

read read data

write write data

<sys/uio.h> scatter-gather related definitions

readv scattered data input

writev gathered data output

<sys/ioctl.h> standard control operations

ioctl device control operation

.h 2.2 "File system

Operations marked with a * exist in two forms: as shown, operating on a file name, and operating on a file descriptor, when the name is preceded with a ``f''.

<sys/file.h> file system definitions

chdir change directory

chroot change root directory

mkdir make a directory

rmdir remove a directory

open open a new or existing file

mknod make a special file

portal\(dg make a portal entry

unlink remove a link

stat* return status for a file

lstat returned status of link

chown* change owner

chmod* change mode

utimes change access/modify times

link make a hard link

symlink make a symbolic link

readlink read contents of symbolic link

rename change name of file

lseek reposition within file

truncate* truncate file

access determine accessibility

flock lock a file

.h 2.3 "Communications

<sys/socket.h> standard definitions

socket create socket

bind bind socket to name

getsockname get socket name

listen allow queuing of connections

accept accept a connection

connect connect to peer socket

socketpair create pair of connected sockets

sendto send data to named socket

send send data to connected socket

recvfrom receive data on unconnected socket

recv receive data on connected socket

sendmsg send gathered data and/or rights

recvmsg receive scattered data and/or rights

shutdown partially close full-duplex connection

getsockopt get socket option

setsockopt set socket option

.h 2.4 "Terminals, block and character devices .h 2.5 "Processes and kernel hooks