* libc/include/sys/stdio.h: New file.

	* libc/sys/linux/sys/stdio.h: New file.
	* libc/include/stdio.h: Add declarations for flockfile,
	ftrylockfile, and funlockfile.  Include <sys/stdio.h>.
	* libc/stdio/clearerr.c: Add file locking.
	* libc/stdio/fclose.c: Likewise.
	* libc/stdio/feof.c: Likewise.
	* libc/stdio/ferror.c: Likewise.
	* libc/stdio/fflush.c: Likewise.
	* libc/stdio/fgetc.c: Likewise.
	* libc/stdio/fgetpos.c: Likewise.
	* libc/stdio/fgets.c: Likewise.
	* libc/stdio/fileno.c: Likewise.
	* libc/stdio/fputc.c: Likewise.
	* libc/stdio/fputs.c: Likewise.
	* libc/stdio/fread.c: Likewise.
	* libc/stdio/freopen.c: Likewise.
	* libc/stdio/fseek.c: Likewise.
	* libc/stdio/ftell.c: Likewise.
	* libc/stdio/fwrite.c: Likewise.
	* libc/stdio/getc.c: Likewise.
	* libc/stdio/putc.c: Likewise.
	* libc/stdio/setvbuf.c: Likewise.
	* libc/stdio/ungetc.c: Likewise.
	* libc/stdio/vfprintf.c: Likewise.

1 files changed, 5 insertions, 2 deletions

diff --git a/newlib/libc/stdio/putc.c b/newlib/libc/stdio/putc.c
index 27a7a42..7e53868 100644
--- a/newlib/libc/stdio/putc.c
+++ b/newlib/libc/stdio/putc.c
@@ -78,7 +78,10 @@ putc (c, fp)
      int c;
      register FILE *fp;
 {
+  int result;
+  _flockfile(fp);
   /* CHECK_INIT is (eventually) called by __swbuf.  */
-
-  return __sputc (c, fp);
+  result = __sputc (c, fp);
+  _funlockfile(fp);
+  return result;
 }