mongoose/examples/stm32/nucleo-f746zg-make-baremetal-builtin/syscalls.c

#include <sys/stat.h>

#include "hal.h"

int _fstat(int fd, struct stat *st) {
  if (fd < 0) return -1;
  st->st_mode = S_IFCHR;
  return 0;
}

void *_sbrk(int incr) {
  extern char _end;
  static unsigned char *heap = NULL;
  unsigned char *prev_heap;
  unsigned char x = 0, *heap_end = (unsigned char *)((size_t) &x - 512);
  (void) x;
  if (heap == NULL) heap = (unsigned char *) &_end;
  prev_heap = heap;
  if (heap + incr > heap_end) return (void *) -1;
  heap += incr;
  return prev_heap;
}

int _open(const char *path) {
  (void) path;
  return -1;
}

int _close(int fd) {
  (void) fd;
  return -1;
}

int _isatty(int fd) {
  (void) fd;
  return 1;
}

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

void _exit(int status) {
  (void) status;
  for (;;) asm volatile("BKPT #0");
}

void _kill(int pid, int sig) {
  (void) pid, (void) sig;
}

int _getpid(void) {
  return -1;
}

int _write(int fd, char *ptr, int len) {
  (void) fd, (void) ptr, (void) len;
  if (fd == 1) uart_write_buf(UART_DEBUG, ptr, (size_t) len);
  return -1;
}

int _read(int fd, char *ptr, int len) {
  (void) fd, (void) ptr, (void) len;
  return -1;
}

int _link(const char *a, const char *b) {
  (void) a, (void) b;
  return -1;
}

int _unlink(const char *a) {
  (void) a;
  return -1;
}

int _stat(const char *path, struct stat *st) {
  (void) path, (void) st;
  return -1;
}

int mkdir(const char *path, mode_t mode) {
  (void) path, (void) mode;
  return -1;
}

void _init(void) {}

extern uint64_t mg_now(void);

int _gettimeofday(struct timeval *tv, void *tz) {
  uint64_t now = mg_now();
  (void) tz;
  tv->tv_sec = (time_t) (now / 1000);
  tv->tv_usec = (unsigned long) ((now % 1000) * 1000);
  return 0;
}