Fix bug: Using unsigned to detect errno<0

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@791 42af7a65-404d-4744-a932-0658087f49c3

examples/pipe/redirect_test.c

@@ -44,6 +44,7 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <sched.h>
+#include <semaphore.h>
 #include <errno.h>
 
 #include "pipe.h"
@@ -62,6 +63,8 @@
  * Private Data
  ****************************************************************************/
 
+static sem_t g_rddone;
+
 /****************************************************************************
  * Private Functions
  ****************************************************************************/
@@ -73,37 +76,49 @@
 static int redirect_reader(int argc, char *argv[])
 {
   char buffer[READ_SIZE];
-  int fd = (int)argv[0];
+  int fdin;
+  int fdout;
   int ret;
   int nbytes = 0;
  
-  printf("redirect_reader: started with fd=%s\n", argv[1]);
+  printf("redirect_reader: started with fdin=%s\n", argv[1]);
 
-  /* Convert the fd to binary */
+  /* Convert the fdin to binary */
 
-  fd = atoi(argv[1]);
+  fdin  = atoi(argv[1]);
+  fdout = atoi(argv[2]);
 
-  /* Re-direct the fd to stdin */
+  /* Close fdout -- we don't need it */
 
-  ret = dup2(fd, 0);
+  ret = close(fdout);
+  if (ret != 0)
+    {
+       fprintf(stderr, "redirect_reader: failed to close fdout=%d\n", fdout);
+       return 1;
+    }
+
+  /* Re-direct the fdin to stdin */
+
+  ret = dup2(fdin, 0);
   if (ret != 0)
     {
         fprintf(stderr, "redirect_reader: dup2 failed: %d\n", errno);
-        close(fd);
-        return 1;
+        close(fdin);
+        return 2;
     }
 
   /* Close the original file descriptor */
 
-  ret = close(fd);
+  ret = close(fdin);
   if (ret != 0)
     {
-       fprintf(stderr, "redirect_reader: failed to close fd=%d\n", fd);
-       return 2;
+       fprintf(stderr, "redirect_reader: failed to close fdin=%d\n", fdin);
+       return 3;
     }
 
   /* Then read from stdin until we hit the end of file */
 
+  fflush(stdout);
   for (;;)
     {
       /* Read from stdin */
@@ -112,7 +127,7 @@ static int redirect_reader(int argc, char *argv[])
       if (ret < 0 )
         {
            fprintf(stderr, "redirect_reader: read failed, errno=%d\n", errno);
-           return 3;
+           return 4;
         }
       else if (ret == 0)
         {
@@ -126,7 +141,7 @@ static int redirect_reader(int argc, char *argv[])
       if (ret < 0)
         {
            fprintf(stderr, "redirect_reader: read failed, errno=%d\n", errno);
-           return 4;
+           return 5;
         }
     }
 
@@ -134,9 +149,11 @@ static int redirect_reader(int argc, char *argv[])
   ret = close(0);
   if (ret != 0)
     {
-       fprintf(stderr, "redirect_reader: failed to close fd=%d\n", fd);
-       return 5;
+       fprintf(stderr, "redirect_reader: failed to close fd=0\n");
+       return 6;
     }
+
+  sem_post(&g_rddone);
   printf("redirect_reader: Returning success\n");
   return 0;
 }
@@ -147,36 +164,48 @@ static int redirect_reader(int argc, char *argv[])
 
 static int redirect_writer(int argc, char *argv[])
 {
-  int fd;
+  int fdin;
+  int fdout;
   int nbytes = 0;
   int ret;
  
-  printf("redirect_writer: started with fd=%s\n", argv[1]);
+  fprintf(stderr, "redirect_writer: started with fdout=%s\n", argv[2]);
+ 
+  /* Convert the fdout to binary */
 
-  /* Convert the fd to binary */
+  fdin  = atoi(argv[1]);
+  fdout = atoi(argv[2]);
 
-  fd = atoi(argv[1]);
+  /* Close fdin -- we don't need it */
 
-  /* Re-direct the fd to stdout */
+  ret = close(fdin);
+  if (ret != 0)
+    {
+       fprintf(stderr, "redirect_reader: failed to close fdin=%d\n", fdin);
+       return 1;
+    }
 
-  ret = dup2(fd, 1);
+  /* Re-direct the fdout to stdout */
+
+  ret = dup2(fdout, 1);
   if (ret != 0)
     {
         fprintf(stderr, "redirect_writer: dup2 failed: %d\n", errno);
-        return 1;
+        return 2;
     }
 
   /* Close the original file descriptor */
 
-  ret = close(fd);
+  ret = close(fdout);
   if (ret != 0)
     {
-       fprintf(stderr, "redirect_reader: failed to close fd=%d\n", fd);
-       return 2;
+       fprintf(stderr, "redirect_reader: failed to close fdout=%d\n", fdout);
+       return 3;
     }
 
   /* Then write a bunch of stuff to stdout */
 
+  fflush(stderr);
   nbytes += printf("\nFour score and seven years ago our fathers brought forth on this continent a new nation,\n");
   nbytes += printf("conceived in Liberty, and dedicated to the proposition that all men are created equal.\n");
   nbytes += printf("\nNow we are engaged in a great civil war, testing whether that nation, or any nation, so\n");
@@ -194,15 +223,18 @@ static int redirect_writer(int argc, char *argv[])
   nbytes += printf("here highly resolve that these dead shall not have died in vain—that this nation, under God,\n");
   nbytes += printf("shall have a new birth of freedom—and that government of the people, by the people, for the\n");
   nbytes += printf("people, shall not perish from the earth.\n\n");
-  printf("redirect_writer: %d bytes read\n", nbytes);
+  fflush(stdout);
+
+  fprintf(stderr, "redirect_writer: %d bytes written\n", nbytes);
 
   ret = close(1);
   if (ret != 0)
     {
-       fprintf(stderr, "redirect_writer: failed to close fd=%d\n", fd);
-       return 3;
+       fprintf(stderr, "redirect_writer: failed to close fd=1\n");
+       return 4;
     }
-  printf("redirect_writer: Returning success\n");
+
+  fprintf(stderr, "redirect_writer: Returning success\n");
   return 0;
 }
 
@@ -216,14 +248,17 @@ static int redirect_writer(int argc, char *argv[])
 
 int redirection_test(void)
 {
-  const char *argv[2];
-  char buffer[8];
+  const char *argv[3];
+  char buffer1[8];
+  char buffer2[8];
   int readerid;
   int writerid;
   int filedes[2];
   int ret;
 
-  /* Create the pipe */
+  sem_init(&g_rddone, 0, 0);
+
+    /* Create the pipe */
 
   ret = pipe(filedes);
   if (ret < 0)
@@ -232,12 +267,15 @@ int redirection_test(void)
       return 5;
     }
  
+  sprintf(buffer1, "%d", filedes[0]);
+  argv[0] = buffer1;
+  sprintf(buffer2, "%d", filedes[1]);
+  argv[1] = buffer2;
+  argv[2] = NULL;
+
   /* Start redirect_reader thread */
 
   printf("redirection_test: Starting redirect_reader task with fd=%d\n", filedes[0]);
-  sprintf(buffer, "%d", filedes[0]);
-  argv[0] = buffer;
-  argv[1] = NULL;
   readerid = task_create("redirect_reader", 50, CONFIG_EXAMPLES_PIPE_STACKSIZE, redirect_reader, argv);
   if (readerid < 0)
     {
@@ -248,9 +286,6 @@ int redirection_test(void)
   /* Start redirect_writer task */
 
   printf("redirection_test: Starting redirect_writer task with fd=%d\n", filedes[1]);
-  sprintf(buffer, "%d", filedes[1]);
-  argv[0] = buffer;
-  argv[1] = NULL;
   writerid = task_create("redirect_writer", 50, CONFIG_EXAMPLES_PIPE_STACKSIZE, redirect_writer, argv);
   if (writerid < 0)
     {
@@ -263,10 +298,27 @@ int redirection_test(void)
       return 2;
     }
 
+  /* We should be able to close the pipe file descriptors now. */
+
+  if (close(filedes[0]) != 0)
+    {
+      fprintf(stderr, "user_start: close failed: %d\n", errno);
+    }
+  if (close(filedes[1]) != 0)
+    {
+      fprintf(stderr, "user_start: close failed: %d\n", errno);
+    }
+
+  if (ret != 0)
+    {
+      fprintf(stderr, "user_start: PIPE test FAILED (%d)\n", ret);
+      return 6;
+    }
+
   /* Wait for redirect_writer thread to complete */
 
   printf("redirection_test: Waiting...\n");
-  sleep(10);
+  sem_wait(&g_rddone);
 
   printf("redirection_test: returning %d\n", ret);
   return ret;