stm32h747/stm32h747i-disco/CM4/Src/syscalls.c

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/* 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;
}
 
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;
}