From 4d7cbe088ed6ea14adc0672b339f1e0df4650f00 Mon Sep 17 00:00:00 2001
From: patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3>
Date: Sun, 12 Aug 2012 17:37:04 +0000
Subject: drivers/serial/serial.c open, read, write, and poll methods will not
 return a short transfer or an EINTR error if a signal is received while
 waiting (only)

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5022 42af7a65-404d-4744-a932-0658087f49c3
---
 apps/system/readline/readline.c | 50 ++++++++++++++++++++++++++++++++++++-----
 1 file changed, 45 insertions(+), 5 deletions(-)

(limited to 'apps/system')

diff --git a/apps/system/readline/readline.c b/apps/system/readline/readline.c
index f7fa6a635..bdd39e67b 100644
--- a/apps/system/readline/readline.c
+++ b/apps/system/readline/readline.c
@@ -103,13 +103,34 @@ static inline int readline_rawgetc(int infd)
   char buffer;
   ssize_t nread;
 
-  nread = read(infd, &buffer, 1);
-  if (nread < 1)
+  /* Loop until we successfully read a character (or until an unexpected
+   * error occurs).
+   */
+
+  do
     {
-      /* Return EOF if the end of file (0) or error (-1) occurs */
+      /* Read one character from the incoming stream */
+
+      nread = read(infd, &buffer, 1);
+
+      /* Return EOF if the end of file (0) or error (-1) occurs. */
+ 
+      if (nread < 1)
+        {
+          /* EINTR is not really an error; it simply means that a signal we
+           * received while watiing for intput.
+           */
 
-      return EOF;
+          if (nread == 0 ||  errno != EINTR)
+            {
+              return EOF;
+            }
+        }
     }
+  while (nread < 1);
+
+  /* On success, returnt he character that was read */
+
   return (int)buffer;
 }
 
@@ -121,7 +142,26 @@ static inline int readline_rawgetc(int infd)
 static inline void readline_consoleputc(int ch, int outfd)
 {
   char buffer = ch;
-  (void)write(outfd, &buffer, 1);
+  ssize_t nwritten;
+
+  /* Loop until we successfully write a character (or until an unexpected
+   * error occurs).
+   */
+
+  do
+    {
+      /* Write the character to the outgoing stream */
+
+      nwritten = write(outfd, &buffer, 1);
+
+      /* Check for irrecoverable write errors. */
+ 
+      if (nwritten < 0 && errno != EINTR)
+        {
+          break;
+        }
+    }
+  while (nwritten < 1);
 }
 #endif
 
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