* 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, 6 insertions, 1 deletions

diff --git a/newlib/libc/stdio/fwrite.c b/newlib/libc/stdio/fwrite.c
index 642fb274f..1c91632b8 100644
--- a/newlib/libc/stdio/fwrite.c
+++ b/newlib/libc/stdio/fwrite.c
@@ -98,7 +98,12 @@ _DEFUN (fwrite, (buf, size, count, fp),
    * generally slow and since this occurs whenever size==0.
    */
 
+  _flockfile(fp);
   if (__sfvwrite (fp, &uio) == 0)
-    return count;
+    {
+      _funlockfile(fp);
+      return count;
+    }
+  _funlockfile(fp);
   return (n - uio.uio_resid) / size;
 }