POSIX Multi-Process option group. More...

Files
file	times.h
	POSIX process CPU time accounting (<sys/times.h>)

Functions
int	pthread_atfork (void(prepare)(void), void(parent)(void), void(*child)(void))
	Register fork handlers to be called around fork().

clock_t	times (struct tms *buf)
	Get the process and child process times.

FUNC_NORETURN void	_exit (int status)
	Terminate the calling process without calling atexit() handlers.

int	execl (const char path, const char arg0,...)
	Replace the process image with a new program (argument list form).

int	execle (const char path, const char arg0,...)
	Replace process image with a new program plus environment (argument list form).

int	execlp (const char file, const char arg0,...)
	Replace process image using PATH search (argument list form).

int	execv (const char path, char const argv[])
	Replace process image with a new program (vector form).

int	execve (const char path, char const argv[], char *const envp[])
	Replace process image with a new program plus environment (vector form).

int	execvp (const char file, char const argv[])
	Replace process image using PATH search (vector form).

int	fexecve (int fd, char const argv[], char const envp[])
	Replace process image using an open file descriptor (vector form).

pid_t	fork (void)
	Create a child process.

gid_t	getegid (void)
	Get the effective group ID of the calling process.

uid_t	geteuid (void)
	Get the effective user ID of the calling process.

gid_t	getgid (void)
	Get the real group ID of the calling process.

int	getgroups (int gidsetsize, gid_t grouplist[])
	Get the supplementary group IDs of the calling process.

char *	getlogin (void)
	Get the login name of the user.

pid_t	getpgid (pid_t pid)
	Get the process group ID of a process.

pid_t	getpgrp (void)
	Get the process group ID of the calling process.

pid_t	getpid (void)
	Get the process ID of the calling process.

pid_t	getppid (void)
	Get the process ID of the parent of the calling process.

pid_t	getsid (pid_t pid)
	Get the session ID of a process.

uid_t	getuid (void)
	Get the real user ID of the calling process.

int	nice (int incr)
	Change the scheduling priority of the calling process (XSI extension).

int	setegid (gid_t gid)
	Set the effective group ID of the calling process.

int	seteuid (uid_t uid)
	Set the effective user ID of the calling process.

int	setgid (gid_t gid)
	Set the real group ID of the calling process.

int	setpgid (pid_t pid, pid_t pgid)
	Set the process group ID for a process.

pid_t	setpgrp (void)
	Set the process group ID to the process ID of the calling process (obsolescent).

pid_t	setsid (void)
	Create a new session and set the process group ID.

int	setuid (uid_t uid)
	Set the real user ID of the calling process.

unsigned int	sleep (unsigned int seconds)
	Suspend execution for at least the specified number of seconds.

pid_t	tcgetpgrp (int fildes)
	Get the process group ID of the foreground process group of the terminal.

int	tcsetpgrp (int fildes, pid_t pgid_id)
	Set the foreground process group ID of a terminal.

int	usleep (useconds_t useconds)
	Suspend execution for at least the specified number of microseconds (obsolescent).

Detailed Description

POSIX Multi-Process option group.

Covers fork(), exec*(), _exit(), getpid(), getppid(), getpgid(), setpgid(), setsid(), getsid(), getuid(), setuid(), getgid(), setgid(), sleep(), tcgetpgrp(), tcsetpgrp(), and related process-control functions.

Function Documentation

◆ _exit()

FUNC_NORETURN void _exit ( int status )

Terminate the calling process without calling atexit() handlers.

◆ execl()

int execl	(	const char *	path,
		const char *	arg0,
			...
	)

Replace the process image with a new program (argument list form).

See also: https://pubs.opengroup.org/onlinepubs/9699919799/functions/execl.html

◆ execle()

int execle	(	const char *	path,
		const char *	arg0,
			...
	)

Replace process image with a new program plus environment (argument list form).

See also: https://pubs.opengroup.org/onlinepubs/9699919799/functions/execle.html

◆ execlp()

int execlp	(	const char *	file,
		const char *	arg0,
			...
	)

Replace process image using PATH search (argument list form).

See also: https://pubs.opengroup.org/onlinepubs/9699919799/functions/execlp.html

◆ execv()

int execv	(	const char *	path,
		char *const	argv[]
	)

Replace process image with a new program (vector form).

See also: https://pubs.opengroup.org/onlinepubs/9699919799/functions/execv.html

◆ execve()

int execve	(	const char *	path,
		char *const	argv[],
		char *const	envp[]
	)

Replace process image with a new program plus environment (vector form).

See also: https://pubs.opengroup.org/onlinepubs/9699919799/functions/execve.html

◆ execvp()

int execvp	(	const char *	file,
		char *const	argv[]
	)

Replace process image using PATH search (vector form).

See also: https://pubs.opengroup.org/onlinepubs/9699919799/functions/execvp.html

◆ fexecve()

int fexecve	(	int	fd,
		char *const	argv[],
		char *const	envp[]
	)

Replace process image using an open file descriptor (vector form).

See also: https://pubs.opengroup.org/onlinepubs/9699919799/functions/fexecve.html

◆ fork()

pid_t fork ( void )

Create a child process.

See also: https://pubs.opengroup.org/onlinepubs/9699919799/functions/fork.html

◆ getegid()

gid_t getegid ( void )

Get the effective group ID of the calling process.

See also: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getegid.html

◆ geteuid()

uid_t geteuid ( void )

Get the effective user ID of the calling process.

See also: https://pubs.opengroup.org/onlinepubs/9699919799/functions/geteuid.html

◆ getgid()

gid_t getgid ( void )

Get the real group ID of the calling process.

See also: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getgid.html

◆ getgroups()

int getgroups	(	int	gidsetsize,
		gid_t	grouplist[]
	)

Get the supplementary group IDs of the calling process.

See also: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getgroups.html

◆ getlogin()

char * getlogin ( void )

Get the login name of the user.

See also: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getlogin.html

◆ getpgid()

pid_t getpgid ( pid_t pid )

Get the process group ID of a process.

See also: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getpgid.html

◆ getpgrp()

pid_t getpgrp ( void )

Get the process group ID of the calling process.

See also: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getpgrp.html

◆ getpid()

pid_t getpid ( void )

Get the process ID of the calling process.

See also: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getpid.html

◆ getppid()

pid_t getppid ( void )

Get the process ID of the parent of the calling process.

See also: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getppid.html

◆ getsid()

pid_t getsid ( pid_t pid )

Get the session ID of a process.

See also: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getsid.html

◆ getuid()

uid_t getuid ( void )

Get the real user ID of the calling process.

See also: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getuid.html

◆ nice()

int nice ( int incr )

Change the scheduling priority of the calling process (XSI extension).

See also: https://pubs.opengroup.org/onlinepubs/9699919799/functions/nice.html

◆ pthread_atfork()

int pthread_atfork	(	void(*)(void)	prepare,
		void(*)(void)	parent,
		void(*)(void)	child
	)

Register fork handlers to be called around fork().

Parameters

prepare	Handler called in the parent before fork().
parent	Handler called in the parent after fork().
child	Handler called in the child after fork().

Returns: 0 on success, or a positive error number on failure.

See also: https://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_atfork.html

◆ setegid()

int setegid ( gid_t gid )

Set the effective group ID of the calling process.

See also: https://pubs.opengroup.org/onlinepubs/9699919799/functions/setegid.html

◆ seteuid()

int seteuid ( uid_t uid )

Set the effective user ID of the calling process.

See also: https://pubs.opengroup.org/onlinepubs/9699919799/functions/seteuid.html

◆ setgid()

int setgid ( gid_t gid )

Set the real group ID of the calling process.

See also: https://pubs.opengroup.org/onlinepubs/9699919799/functions/setgid.html

◆ setpgid()

int setpgid	(	pid_t	pid,
		pid_t	pgid
	)

Set the process group ID for a process.

See also: https://pubs.opengroup.org/onlinepubs/9699919799/functions/setpgid.html

◆ setpgrp()

pid_t setpgrp ( void )

Set the process group ID to the process ID of the calling process (obsolescent).

See also: https://pubs.opengroup.org/onlinepubs/9699919799/functions/setpgrp.html

◆ setsid()

pid_t setsid ( void )

Create a new session and set the process group ID.

See also: https://pubs.opengroup.org/onlinepubs/9699919799/functions/setsid.html

◆ setuid()

int setuid ( uid_t uid )

Set the real user ID of the calling process.

See also: https://pubs.opengroup.org/onlinepubs/9699919799/functions/setuid.html

◆ sleep()

unsigned int sleep ( unsigned int seconds )

Suspend execution for at least the specified number of seconds.

◆ tcgetpgrp()

pid_t tcgetpgrp ( int fildes )

Get the process group ID of the foreground process group of the terminal.

See also: https://pubs.opengroup.org/onlinepubs/9699919799/functions/tcgetpgrp.html

◆ tcsetpgrp()

int tcsetpgrp	(	int	fildes,
		pid_t	pgid_id
	)

Set the foreground process group ID of a terminal.

See also: https://pubs.opengroup.org/onlinepubs/9699919799/functions/tcsetpgrp.html

◆ times()

clock_t times ( struct tms * buf )

Get the process and child process times.