syscalls.c File Reference

Implementation of newlib syscall. More...

#include "stm32_def.h"
#include <errno.h>

Functions
caddr_t	_sbrk (int incr)
	Increase the program data space (heap) used by malloc.
int	_close (int file)
	Close a file.
int	_fstat (int file, struct stat *st)
	Get file status.
int	_isatty (int file)
	Check whether a file descriptor refers to a terminal.
int	_lseek (int file, int ptr, int dir)
	Set the file position.
int	_read (int file, char *ptr, int len)
	Read from a file.
void	_exit (int status)
	Terminate the program.
int	_kill (int pid, int sig)
	Send a signal to a process.
int	_getpid (void)
	Get the process ID.

Variables
int	errno

Detailed Description

Implementation of newlib syscall.

Function Documentation

_close()

int _close

(

int

file

)

Close a file.

Not supported, always fails.

Parameters

file	File descriptor to close.

Returns

-1.

_exit()

void _exit

(

int

status

)

Terminate the program.

Loops forever.

Parameters

status

Exit status (ignored).

_fstat()

int _fstat	(	int	file,
		struct stat *	st
	)

Get file status.

Reports every file as a character device.

Parameters

file	File descriptor.
st	Buffer that receives the file status.

Returns

0.

_getpid()

int _getpid

(

void

)

Get the process ID.

Always returns 1.

Returns

1.

_isatty()

int _isatty

(

int

file

)

Check whether a file descriptor refers to a terminal.

Always reports a terminal.

Parameters

file	File descriptor.

Returns

1.

_kill()

int _kill	(	int	pid,
		int	sig
	)

Send a signal to a process.

Not supported, always fails.

Parameters

pid	Process ID.
sig	Signal number.

Returns

-1 with errno set to EINVAL.

_lseek()

int _lseek	(	int	file,
		int	ptr,
		int	dir
	)

Set the file position.

Not supported, always returns 0.

Parameters

file	File descriptor.
ptr	Offset.
dir	Seek direction.

Returns

0.

_read()

int _read	(	int	file,
		char *	ptr,
		int	len
	)

Read from a file.

Not supported, always returns 0 bytes read.

Parameters

file	File descriptor.
ptr	Buffer to fill.
len	Maximum number of bytes to read.

Returns

0.

_sbrk()

caddr_t _sbrk

(

int

incr

)

Increase the program data space (heap) used by malloc.

Parameters

incr	Number of bytes to add to the heap.

Returns

Previous heap end on success, or (caddr_t)-1 with errno set to ENOMEM.