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Core/Src/syscalls.c

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+/**
+ ******************************************************************************
+ * @file      syscalls.c
+ * @author    Auto-generated by STM32CubeMX
+ * @brief     Minimal System calls file
+ *
+ *            For more information about which c-functions
+ *            need which of these lowlevel functions
+ *            please consult the Newlib or Picolibc libc-manual
+ ******************************************************************************
+ * @attention
+ *
+ * Copyright (c) 2020-2025 STMicroelectronics.
+ * All rights reserved.
+ *
+ * This software is licensed under terms that can be found in the LICENSE file
+ * in the root directory of this software component.
+ * If no LICENSE file comes with this software, it is provided AS-IS.
+ *
+ ******************************************************************************
+ */
+
+/* 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 */
+extern int __io_putchar(int ch) __attribute__((weak));
+extern int __io_getchar(void) __attribute__((weak));
+
+
+char *__env[1] = { 0 };
+char **environ = __env;
+
+
+/* Functions */
+void initialise_monitor_handles()
+{
+}
+
+int _getpid(void)
+{
+  return 1;
+}
+
+int _kill(int pid, int sig)
+{
+  (void)pid;
+  (void)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)
+{
+  (void)file;
+  int DataIdx;
+
+  for (DataIdx = 0; DataIdx < len; DataIdx++)
+  {
+    *ptr++ = __io_getchar();
+  }
+
+  return len;
+}
+
+__attribute__((weak)) int _write(int file, char *ptr, int len)
+{
+  (void)file;
+  int DataIdx;
+
+  for (DataIdx = 0; DataIdx < len; DataIdx++)
+  {
+    __io_putchar(*ptr++);
+  }
+  return len;
+}
+
+int _close(int file)
+{
+  (void)file;
+  return -1;
+}
+
+
+int _fstat(int file, struct stat *st)
+{
+  (void)file;
+  st->st_mode = S_IFCHR;
+  return 0;
+}
+
+int _isatty(int file)
+{
+  (void)file;
+  return 1;
+}
+
+int _lseek(int file, int ptr, int dir)
+{
+  (void)file;
+  (void)ptr;
+  (void)dir;
+  return 0;
+}
+
+int _open(char *path, int flags, ...)
+{
+  (void)path;
+  (void)flags;
+  /* Pretend like we always fail */
+  return -1;
+}
+
+int _wait(int *status)
+{
+  (void)status;
+  errno = ECHILD;
+  return -1;
+}
+
+int _unlink(char *name)
+{
+  (void)name;
+  errno = ENOENT;
+  return -1;
+}
+
+clock_t _times(struct tms *buf)
+{
+  (void)buf;
+  return -1;
+}
+
+int _stat(const char *file, struct stat *st)
+{
+  (void)file;
+  st->st_mode = S_IFCHR;
+  return 0;
+}
+
+int _link(char *old, char *new)
+{
+  (void)old;
+  (void)new;
+  errno = EMLINK;
+  return -1;
+}
+
+int _fork(void)
+{
+  errno = EAGAIN;
+  return -1;
+}
+
+int _execve(char *name, char **argv, char **env)
+{
+  (void)name;
+  (void)argv;
+  (void)env;
+  errno = ENOMEM;
+  return -1;
+}
+
+// --- Picolibc Specific Section ---
+#if defined(__PICOLIBC__)
+
+/**
+ * @brief Picolibc helper function to output a character to a FILE stream.
+ *        This redirects the output to the low-level __io_putchar function.
+ * @param c Character to write.
+ * @param file FILE stream pointer (ignored).
+ * @retval int The character written.
+ */
+static int starm_putc(char c, FILE *file)
+{
+	(void) file;
+  __io_putchar(c);
+	return c;
+}
+
+/**
+ * @brief Picolibc helper function to input a character from a FILE stream.
+ *        This redirects the input from the low-level __io_getchar function.
+ * @param file FILE stream pointer (ignored).
+ * @retval int The character read, cast to an unsigned char then int.
+ */
+static int starm_getc(FILE *file)
+{
+	unsigned char c;
+	(void) file;
+  c = __io_getchar();
+	return c;
+}
+
+// Define and initialize the standard I/O streams for Picolibc.
+// FDEV_SETUP_STREAM connects the starm_putc and starm_getc helper functions to a FILE structure.
+// _FDEV_SETUP_RW indicates the stream is for reading and writing.
+static FILE __stdio = FDEV_SETUP_STREAM(starm_putc,
+					starm_getc,
+					NULL,
+					_FDEV_SETUP_RW);
+
+// Assign the standard stream pointers (stdin, stdout, stderr) to the initialized stream.
+// Picolibc uses these pointers for standard I/O operations (printf, scanf, etc.).
+FILE *const stdin = &__stdio;
+__strong_reference(stdin, stdout);
+__strong_reference(stdin, stderr);
+
+// Create strong aliases mapping standard C library function names (without underscore)
+// to the implemented system call stubs (with underscore). Picolibc uses these
+// standard names internally, so this linking is required.
+__strong_reference(_read, read);
+__strong_reference(_write, write);
+__strong_reference(_times, times);
+__strong_reference(_execve, execve);
+__strong_reference(_fork, fork);
+__strong_reference(_link, link);
+__strong_reference(_unlink, unlink);
+__strong_reference(_stat, stat);
+__strong_reference(_wait, wait);
+__strong_reference(_open, open);
+__strong_reference(_close, close);
+__strong_reference(_lseek, lseek);
+__strong_reference(_isatty, isatty);
+__strong_reference(_fstat, fstat);
+__strong_reference(_exit, exit);
+__strong_reference(_kill, kill);
+__strong_reference(_getpid, getpid);
+
+#endif //__PICOLIBC__