source: trunk/fw_g473rct/SES/src/syscalls.c@ 20

/**
*****************************************************************************
**
**  File        : syscalls.c
**
**  Abstract    : System Workbench Minimal System calls file
**
**                        For more information about which c-functions
**                need which of these lowlevel functions
**                please consult the Newlib libc-manual
**
**  Environment : System Workbench for MCU
**
**  Distribution: The file is distributed “as is,” without any warranty
**                of any kind.
**
*****************************************************************************
**
** <h2><center>&copy; COPYRIGHT(c) 2014 Ac6</center></h2>
**
** Redistribution and use in source and binary forms, with or without modification,
** are permitted provided that the following conditions are met:
**   1. Redistributions of source code must retain the above copyright notice,
**      this list of conditions and the following disclaimer.
**   2. Redistributions in binary form must reproduce the above copyright notice,
**      this list of conditions and the following disclaimer in the documentation
**      and/or other materials provided with the distribution.
**   3. Neither the name of Ac6 nor the names of its contributors
**      may be used to endorse or promote products derived from this software
**      without specific prior written permission.
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
** AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
** DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
** SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
** OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**
*****************************************************************************
*/

/* Includes */
#include <sys/stat.h>
#include <stdlib.h>
#include <errno.h>
#include <stdio.h>
#include <signal.h>
#include <time.h>
#include <sys/time.h>
//#include <sys/times.h>


/* Variables */
#undef errno
extern int errno;
extern int __io_putchar(int ch) __attribute__((weak));
extern int __io_getchar(void) __attribute__((weak));

register char * stack_ptr asm("sp");

char *__env[1] = { 0 };
char **environ = __env;


/* Functions */
void initialise_monitor_handles()
{
}

int _getpid(void)
{
        return 1;
}

int _kill(int pid, int sig)
{
        errno = EINVAL;
        return -1;
}

void _exit (int status)
{
        _kill(status, -1);
        while (1) {}            /* Make sure we hang here */
}

__attribute__((weak)) int _read(int file, char *ptr, int len)
{
        int DataIdx;

        for (DataIdx = 0; DataIdx < len; DataIdx++)
        {
                *ptr++ = __io_getchar();
        }

return len;
}

__attribute__((weak)) int _write(int file, char *ptr, int len)
{
        int DataIdx;

        for (DataIdx = 0; DataIdx < len; DataIdx++)
        {
                __io_putchar(*ptr++);
        }
        return len;
}

caddr_t _sbrk(int incr)
{
        extern char end asm("end");
        static char *heap_end;
        char *prev_heap_end;

        if (heap_end == 0)
                heap_end = &end;

        prev_heap_end = heap_end;
        if (heap_end + incr > stack_ptr)
        {
//              write(1, "Heap and stack collision\n", 25);
//              abort();
                errno = ENOMEM;
                return (caddr_t) -1;
        }

        heap_end += incr;

        return (caddr_t) prev_heap_end;
}

int _close(int file)
{
        return -1;
}


int _fstat(int file, struct stat *st)
{
        st->st_mode = S_IFCHR;
        return 0;
}

int _isatty(int file)
{
        return 1;
}

int _lseek(int file, int ptr, int dir)
{
        return 0;
}

int _open(char *path, int flags, ...)
{
        /* Pretend like we always fail */
        return -1;
}

int _wait(int *status)
{
        //errno = ECHILD;
        return -1;
}

int _unlink(char *name)
{
        //errno = ENOENT;
        return -1;
}

int _times(struct tms *buf)
{
        return -1;
}

int _stat(char *file, struct stat *st)
{
        st->st_mode = S_IFCHR;
        return 0;
}

int _link(char *old, char *new)
{
        //errno = EMLINK;
        return -1;
}

int _fork(void)
{
        //errno = EAGAIN;
        return -1;
}

int _execve(char *name, char **argv, char **env)
{
        errno = ENOMEM;
        return -1;
}