.

lib/full-write.c

@@ -0,0 +1,67 @@
+/* safe-write.c -- an interface to write that retries after interrupts
+   Copyright (C) 1993 Free Software Foundation, Inc.
+
+   This program 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.
+
+   This program 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 this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+   Copied largely from GNU C's cccp.c.
+   */
+
+#ifdef HAVE_CONFIG_H
+#if defined (CONFIG_BROKETS)
+/* We use <config.h> instead of "config.h" so that a compilation
+   using -I. -I$srcdir will use ./config.h rather than $srcdir/config.h
+   (which it would do because it found this file in $srcdir).  */
+#include <config.h>
+#else
+#include "config.h"
+#endif
+#endif
+
+#include <sys/types.h>
+
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#include <errno.h>
+#ifndef STDC_HEADERS
+extern int errno;
+#endif
+
+/* Write LEN bytes at PTR to descriptor DESC, retrying if interrupted.
+   Return zero upon success, write's (negative) error code otherwise.  */
+
+int
+safe_write (desc, ptr, len)
+     int desc;
+     char *ptr;
+     int len;
+{
+  while (len > 0)
+    {
+      int written = write (desc, ptr, len);
+      if (written < 0)
+	{
+#ifdef EINTR
+	  if (errno == EINTR)
+	    continue;
+#endif
+	  return written;
+	}
+      ptr += written;
+      len -= written;
+    }
+  return 0;
+}

lib/safe-read.c

@@ -0,0 +1,31 @@
+/* Read LEN bytes at PTR from descriptor DESC, retrying if necessary.
+   Return the actual number of bytes read, zero for EOF, or negative
+   for an error.  */
+
+int
+safe_read (desc, ptr, len)
+     int desc;
+     char *ptr;
+     int len;
+{
+  int n_remaining;
+
+  n_remaining = len;
+  while (n_remaining > 0)
+    {
+      int n_chars = read (desc, ptr, n_remaining);
+      if (n_chars < 0)
+	{
+#ifdef EINTR
+	  if (errno == EINTR)
+	    continue;
+#endif
+	  return n_chars;
+	}
+      if (n_chars == 0)
+	break;
+      ptr += n_chars;
+      n_remaining -= n_chars;
+    }
+  return len - n_remaining;
+}