Imported from ../bash-2.04.tar.gz.

lib/sh/zwrite.c

@@ -0,0 +1,61 @@
+/* Copyright (C) 1999 Free Software Foundation, Inc.
+
+   This file is part of GNU Bash, the Bourne Again SHell.
+
+   Bash is free software; you can redistribute it and/or modify it under
+   the terms of the GNU General Public License as published by the Free
+   Software Foundation; either version 2, or (at your option) any later
+   version.
+
+   Bash is distributed in the hope that it will be useful, but WITHOUT ANY
+   WARRANTY; without even the implied warranty of MERCHANTABILITY or
+   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+   for more details.
+   
+   You should have received a copy of the GNU General Public License along
+   with Bash; see the file COPYING.  If not, write to the Free Software
+   Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
+
+#include <config.h>
+
+#include <sys/types.h>
+
+#if defined (HAVE_UNISTD_H)
+#  include <unistd.h>
+#endif
+
+#include <errno.h>
+
+#if !defined (errno)
+extern int errno;
+#endif
+
+/* Write NB bytes from BUF to file descriptor FD, retrying the write if
+   it is interrupted.  We retry three times if we get a zero-length
+   write.  Any other signal causes this function to return prematurely. */
+int
+zwrite (fd, buf, nb)
+     int fd;
+     unsigned char *buf;
+     size_t nb;
+{
+  int n, i, nt;
+
+  for (n = nb, nt = 0;;)
+    {
+      i = write (fd, buf, n);
+      if (i > 0)
+	{
+	  n -= i;
+	  if (n <= 0)
+	    return nb;
+	}
+      else if (i == 0)
+	{
+	  if (++nt > 3)
+	    return (nb - n);
+	}
+      else if (errno != EINTR)
+	return -1;
+    }
+}