Provides APIs for Standard Symbolic Constants and Types. More...

Collaboration diagram for UNISTD:

Files
file	unistd.h
	POSIX operating system APIs.

Macros
#define	ATEXIT_MAX 1

#define	SEEK_SET 0 /* From the start of the file */

#define	SEEK_CUR 1 /* From the current file offset */

#define	SEEK_END 2 /* From the end of the file */

#define	F_OK 0 /* Test existence */

#define	R_OK 1 /* Test read permission */

#define	W_OK 2 /* Test write permission */

#define	X_OK 4 /* Test execute permission */

#define	POSIX_VERSION

#define	_POSIX_REALTIME_SIGNALS 1

#define	_POSIX_MESSAGE_PASSING 1

#define	_POSIX_PRIORITY_SCHEDULING 1

#define	_POSIX_TIMERS 1

#define	_POSIX_SYNCHRONIZED_IO 1

#define	_POSIX_SYNC_IO 1

#define	fdatasync(f) fsync(f)

#define	EXTERN extern

Functions
pid_t	vfork (void)
	The vfork() function has the same effect as fork(), except that the behavior is undefined if the process created by vfork() either modifies any data other than a variable of type pid_t used to store the return value from vfork(), or returns from the function in which vfork() was called, or calls any other function before successfully calling _exit() or one of the exec family of functions. More...

pid_t	getpid (void)
	POSIX APIs (refer to : http://pubs.opengroup.org/onlinepubs/9699919799/) More...

unsigned int	sleep (unsigned int seconds)
	POSIX APIs (refer to : http://pubs.opengroup.org/onlinepubs/9699919799/) More...

int	usleep (useconds_t usec)
	POSIX APIs (refer to : http://pubs.opengroup.org/onlinepubs/9699919799/) More...

int	pause (void)
	POSIX APIs (refer to : http://pubs.opengroup.org/onlinepubs/9699919799/) More...

int	close (int fd)
	POSIX APIs (refer to : http://pubs.opengroup.org/onlinepubs/9699919799/) More...

int	dup (int fd)
	POSIX APIs (refer to : http://pubs.opengroup.org/onlinepubs/9699919799/) More...

int	dup2 (int fd1, int fd2)
	POSIX APIs (refer to : http://pubs.opengroup.org/onlinepubs/9699919799/) More...

int	fsync (int fd)
	POSIX APIs (refer to : http://pubs.opengroup.org/onlinepubs/9699919799/) More...

off_t	lseek (int fd, off_t offset, int whence)
	POSIX APIs (refer to : http://pubs.opengroup.org/onlinepubs/9699919799/) More...

ssize_t	read (int fd, FAR void *buf, size_t nbytes)
	POSIX APIs (refer to : http://pubs.opengroup.org/onlinepubs/9699919799/) More...

ssize_t	write (int fd, FAR const void *buf, size_t nbytes)
	POSIX APIs (refer to : http://pubs.opengroup.org/onlinepubs/9699919799/) More...

ssize_t	pread (int fd, FAR void *buf, size_t nbytes, off_t offset)
	POSIX APIs (refer to : http://pubs.opengroup.org/onlinepubs/9699919799/) More...

ssize_t	pwrite (int fd, FAR const void *buf, size_t nbytes, off_t offset)
	POSIX APIs (refer to : http://pubs.opengroup.org/onlinepubs/9699919799/) More...

int	pipe (int fd[2])
	POSIX APIs (refer to : http://pubs.opengroup.org/onlinepubs/9699919799/) More...

int	chdir (FAR const char *path)
	POSIX APIs (refer to : http://pubs.opengroup.org/onlinepubs/9699919799/) More...

FAR char *	getcwd (FAR char *buf, size_t size)
	POSIX APIs (refer to : http://pubs.opengroup.org/onlinepubs/9699919799/) More...

int	rmdir (FAR const char *pathname)
	POSIX APIs (refer to : http://pubs.opengroup.org/onlinepubs/9699919799/) More...

int	unlink (FAR const char *pathname)
	POSIX APIs (refer to : http://pubs.opengroup.org/onlinepubs/9699919799/) More...

int	getopt (int argc, FAR char const argv[], FAR const char optstring)
	POSIX APIs (refer to : http://pubs.opengroup.org/onlinepubs/9699919799/) More...

Variables
EXTERN FAR char *	optarg

EXTERN int	optind

EXTERN int	optopt

Detailed Description

Provides APIs for Standard Symbolic Constants and Types.

Macro Definition Documentation

#define _POSIX_MESSAGE_PASSING 1

Definition at line 102 of file unistd.h.

#define _POSIX_PRIORITY_SCHEDULING 1

Definition at line 105 of file unistd.h.

#define _POSIX_REALTIME_SIGNALS 1

Definition at line 101 of file unistd.h.

#define _POSIX_SYNC_IO 1

Definition at line 120 of file unistd.h.

#define _POSIX_SYNCHRONIZED_IO 1

Definition at line 110 of file unistd.h.

#define _POSIX_TIMERS 1

Definition at line 106 of file unistd.h.

#define ATEXIT_MAX 1

Definition at line 81 of file unistd.h.

#define EXTERN extern

Definition at line 135 of file unistd.h.

#define F_OK 0 /* Test existence */

Definition at line 91 of file unistd.h.

#define fdatasync ( f ) fsync(f)

Definition at line 124 of file unistd.h.

#define POSIX_VERSION

Definition at line 98 of file unistd.h.

#define R_OK 1 /* Test read permission */

Definition at line 92 of file unistd.h.

#define SEEK_CUR 1 /* From the current file offset */

Definition at line 86 of file unistd.h.

#define SEEK_END 2 /* From the end of the file */

Definition at line 87 of file unistd.h.

#define SEEK_SET 0 /* From the start of the file */

Definition at line 85 of file unistd.h.

#define W_OK 2 /* Test write permission */

Definition at line 93 of file unistd.h.

#define X_OK 4 /* Test execute permission */

Definition at line 94 of file unistd.h.

Function Documentation

int chdir ( FAR const char * path )

POSIX APIs (refer to : http://pubs.opengroup.org/onlinepubs/9699919799/)

Since: Tizen RT v1.0

int close ( int fd )

POSIX APIs (refer to : http://pubs.opengroup.org/onlinepubs/9699919799/)

[SYSTEM CALL API]

Since: Tizen RT v1.0

int dup ( int fd )

POSIX APIs (refer to : http://pubs.opengroup.org/onlinepubs/9699919799/)

[SYSTEM CALL API]

Since: Tizen RT v1.0

int dup2	(	int	fd1,
		int	fd2
	)

POSIX APIs (refer to : http://pubs.opengroup.org/onlinepubs/9699919799/)

[SYSTEM CALL API]

Since: Tizen RT v1.0

int fsync ( int fd )

POSIX APIs (refer to : http://pubs.opengroup.org/onlinepubs/9699919799/)

[SYSTEM CALL API]

Since: Tizen RT v1.0

FAR char* getcwd	(	FAR char *	buf,
		size_t	size
	)

POSIX APIs (refer to : http://pubs.opengroup.org/onlinepubs/9699919799/)

Since: Tizen RT v1.0

int getopt	(	int	argc,
		FAR char *const	argv[],
		FAR const char *	optstring
	)

POSIX APIs (refer to : http://pubs.opengroup.org/onlinepubs/9699919799/)

Since: Tizen RT v1.0

pid_t getpid ( void )

POSIX APIs (refer to : http://pubs.opengroup.org/onlinepubs/9699919799/)

Since: Tizen RT v1.0

off_t lseek	(	int	fd,
		off_t	offset,
		int	whence
	)

POSIX APIs (refer to : http://pubs.opengroup.org/onlinepubs/9699919799/)

[SYSTEM CALL API]

Since: Tizen RT v1.0

int pause ( void )

POSIX APIs (refer to : http://pubs.opengroup.org/onlinepubs/9699919799/)

Since: Tizen RT v1.0

int pipe ( int fd[2] )

POSIX APIs (refer to : http://pubs.opengroup.org/onlinepubs/9699919799/)

[SYSTEM CALL API]

Since: Tizen RT v1.0

ssize_t pread	(	int	fd,
		FAR void *	buf,
		size_t	nbytes,
		off_t	offset
	)

POSIX APIs (refer to : http://pubs.opengroup.org/onlinepubs/9699919799/)

[SYSTEM CALL API]

Since: Tizen RT v1.0

ssize_t pwrite	(	int	fd,
		FAR const void *	buf,
		size_t	nbytes,
		off_t	offset
	)

POSIX APIs (refer to : http://pubs.opengroup.org/onlinepubs/9699919799/)

[SYSTEM CALL API]

Since: Tizen RT v1.0

ssize_t read	(	int	fd,
		FAR void *	buf,
		size_t	nbytes
	)

POSIX APIs (refer to : http://pubs.opengroup.org/onlinepubs/9699919799/)

[SYSTEM CALL API]

Since: Tizen RT v1.0

int rmdir ( FAR const char * pathname )

POSIX APIs (refer to : http://pubs.opengroup.org/onlinepubs/9699919799/)

[SYSTEM CALL API]

Since: Tizen RT v1.0

unsigned int sleep ( unsigned int seconds )

POSIX APIs (refer to : http://pubs.opengroup.org/onlinepubs/9699919799/)

Since: Tizen RT v1.0

int unlink ( FAR const char * pathname )

POSIX APIs (refer to : http://pubs.opengroup.org/onlinepubs/9699919799/)

[SYSTEM CALL API]

Since: Tizen RT v1.0

int usleep ( useconds_t usec )

POSIX APIs (refer to : http://pubs.opengroup.org/onlinepubs/9699919799/)

Since: Tizen RT v1.0

pid_t vfork ( void )

The vfork() function has the same effect as fork(), except that the behavior is undefined if the process created by vfork() either modifies any data other than a variable of type pid_t used to store the return value from vfork(), or returns from the function in which vfork() was called, or calls any other function before successfully calling _exit() or one of the exec family of functions.

This thin layer implements vfork by simply calling up_vfork() with the vfork() context as an argument. The overall sequence is:

1) User code calls vfork(). vfork() collects context information and transfers control up up_vfork(). 2) up_vfork()and calls task_vforksetup(). 3) task_vforksetup() allocates and configures the child task's TCB. This consists of:

Allocation of the child task's TCB.
Initialization of file descriptors and streams
Configuration of environment variables
Setup the intput parameters for the task.
Initialization of the TCB (including call to up_initial_state() 4) up_vfork() provides any additional operating context. up_vfork must:
Allocate and initialize the stack
Initialize special values in any CPU registers that were not already configured by up_initial_state() 5) up_vfork() then calls task_vforkstart() 6) task_vforkstart() then executes the child thread.

Returns: Upon successful completion, vfork() returns 0 to the child process and returns the process ID of the child process to the parent process. Otherwise, -1 is returned to the parent, no child process is created, and errno is set to indicate the error.

Since: Tizen RT v1.0

ssize_t write	(	int	fd,
		FAR const void *	buf,
		size_t	nbytes
	)

POSIX APIs (refer to : http://pubs.opengroup.org/onlinepubs/9699919799/)

[SYSTEM CALL API]

Since: Tizen RT v1.0

Variable Documentation

EXTERN FAR char* optarg

Definition at line 144 of file unistd.h.

EXTERN int optind

Definition at line 145 of file unistd.h.

EXTERN int optopt

Definition at line 146 of file unistd.h.

Files

Macros

Functions

Variables

Detailed Description

Macro Definition Documentation

Function Documentation

Variable Documentation