Initial revision

lib/full-read.c

@@ -0,0 +1,60 @@
+/* full-read.c -- an interface to read that retries after interrupts
+   Copyright (C) 1993, 1994, 1997 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+   */
+
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <sys/types.h>
+
+#if HAVE_UNISTD_H
+# include <unistd.h>
+#endif
+
+#include <errno.h>
+#ifndef errno
+extern int errno;
+#endif
+
+/* Read LEN bytes at PTR from descriptor DESC, retrying if interrupted.
+   Return the actual number of bytes read, zero for EOF, or negative
+   for an error.  */
+
+int
+full_read (desc, ptr, len)
+     int desc;
+     char *ptr;
+     size_t len;
+{
+  int n_chars;
+
+  if (len <= 0)
+    return len;
+
+#ifdef EINTR
+  do
+    {
+      n_chars = read (desc, ptr, len);
+    }
+  while (n_chars < 0 && errno == EINTR);
+#else
+  n_chars = read (desc, ptr, len);
+#endif
+
+  return n_chars;
+}