Kernel Extensions and Device Support Programming Concepts

System Calls Available to Kernel Extensions

The following system calls are grouped according to which subroutines call them:

Note

System calls are not available to interrupt handlers.

System Calls Available to All Kernel Extensions

gethostid	Gets the unique identifier of the current host.
getpgrp	Gets the process ID, process group ID, and parent process ID.
getppid	Gets the process ID, process group ID, and parent process ID.
getpri	Returns the scheduling priority of a process.
getpriority	Gets or sets the nice value.
semget	Gets a set of semaphores.
seteuid	Sets the process user IDs.
setgid	Sets the process group IDs.
sethostid	Sets the unique identifier of the current host.
setpgid	Sets the process group IDs.
setpgrp	Sets the process group IDs.
setpri	Sets a process scheduling priority to a constant value.
setpriority	Gets or sets the nice value.
setreuid	Sets the process user IDs.
setsid	Creates a session and sets the process group ID.
setuid	Sets the process user IDs.
ulimit	Sets and gets user limits.
umask	Sets and gets the value of the file-creation mask.

System Calls Available to Kernel Processes Only

disclaim	Disclaims the content of a memory address range.
getdomainname	Gets the name of the current domain.
getgroups	Gets the concurrent group set of the current process.
gethostname	Gets the name of the local host.
getpeername	Gets the name of the peer socket.
getrlimit	Controls maximum system resource consumption.
getrusage	Displays information about resource use.
getsockname	Gets the socket name.
getsockopt	Gets options on sockets.
gettimer	Gets and sets the current value for the specified system-wide timer.
resabs	Manipulates the expiration time of interval timers.
resinc	Manipulates the expiration time of interval timers.
restimer	Gets and sets the current value for the specified system-wide timer.
semctl	Controls semaphore operations.
semop	Performs semaphore operations.
setdomainname	Sets the name of the current domain.
setgroups	Sets the concurrent group set of the current process.
sethostname	Sets the name of the current host.
setrlimit	Controls maximum system resource consumption.
settimer	Gets and sets the current value for the specified systemwide timer.
shmat	Attaches a shared memory segment or a mapped file to the current process.
shmctl	Controls shared memory operations.
shmdt	Detaches a shared memory segment.
shmget	Gets shared memory segments.
sigaction	Specifies the action to take upon delivery of a signal.
sigprocmask	Sets the current signal mask.
sigstack	Sets and gets signal stack context.
sigsuspend	Atomically changes the set of blocked signals and waits for a signal.
sysconfig	Provides a service for controlling system/kernel configuration.
sys_parm	Provides a service for examining or setting kernel run-time tunable parameters.
times	Displays information about resource use.
uname	Gets the name of the current system.
unamex	Gets the name of the current system.
usrinfo	Gets and sets user information about the owner of the current process.
utimes	Sets file access and modification times.