Real-Time Windows Target

Nonsupported C Functions

If you create your own custom I/O driver blocks, you should first check for C functions that are supported by the Real-Time Windows Target.

Functions that use the Windows operating system are not supported with the Real-Time Windows Target. This is because the kernel intercepts the system clock and first runs the real-time application. If there is time left before the next sample time, the kernel may allow a Windows application or function to run.

The following list includes many, but not all of the nonsupported functions:

• File I/O -- fopen freopen, fclose, fread, fwrite, fputs, fputc, fgets, fgetc, gets, getc, getchar, puts, putc, putchar, fflush, setbuf, setvbuf
• Console I/O -- printf, fprintf, sprintf, vfprintf, vprintf, vsprintf, fscanf, scanf, sscanf
• Process management -- spawn, exit, abort, atexit
• Signals and exceptions -- signal, longimp, raise
• Time functions -- clock, time, difftime, asctime, ctime, difftime, gmtime, localtime, mktime, strftime
• Win32 API functions. No Windows API functions are supported.

Incompatibility with Win32 API Calls

Supported C Functions