Reflect renaming: nanosleep.h -> timespec.h.

[gnulib.git] / lib / safe-read.c

diff --git a/lib/safe-read.c b/lib/safe-read.c
index d915d4e..e404586 100644 (file)
--- a/lib/safe-read.c
+++ b/lib/safe-read.c
@@ -1,31 +1,59 @@
-/* Read LEN bytes at PTR from descriptor DESC, retrying if necessary.
+/* safe-read.c -- an interface to read that retries after interrupts
+   Copyright (C) 1993, 1994, 1998 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
+
+#include "safe-read.h"
+
+/* 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
-safe_read (desc, ptr, len)
-     int desc;
-     char *ptr;
-     int len;
+ssize_t
+safe_read (int desc, void *ptr, size_t len)
 {
-  int n_remaining;
+  ssize_t n_chars;
+
+  if (len <= 0)
+    return len;
 
-  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;
+  do
+    {
+      n_chars = read (desc, ptr, len);
     }
-  return len - n_remaining;
+  while (n_chars < 0 && errno == EINTR);
+#else
+  n_chars = read (desc, ptr, len);
+#endif
+
+  return n_chars;
 }