Close stdio files before POSIX file descriptors

Author: mysterymath

mos-platform/commodore/open.s

@@ -18,7 +18,9 @@
 ;--------------------------------------------------------------------------
 ; closeallfiles: Close all open files.
 
-.section .fini,"axR",@progbits
+; This must happen after fclosing all stdio files.
+
+.section .fini.200,"axR",@progbits
 closeallfiles:
 
         ldx     #MAX_FDS-1

mos-platform/commodore/write.s

@@ -23,7 +23,7 @@
 ;--------------------------------------------------------------------------
 ; initstdout: Open the stdout and stderr file descriptors for the screen.
 
-.section .init,"aR",@progbits
+.section .init,"axR",@progbits
   jsr initstdout
 
 .text

mos-platform/common/c/stdio-full.c

@@ -61,7 +61,8 @@ FILE *stderr = &serr;
 
 static FILE *filelist = &sin;
 
-asm(".section .fini,\"axR\",@progbits\n"
+// This must happen before all POSIX open files are closed.
+asm(".section .fini.100,\"axR\",@progbits\n"
     "  jsr _stdio_closeall\n");
 
 void _stdio_closeall(void) {