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nuttx-bb/apps/examples/pipe/redirect_test.c

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/****************************************************************************
* examples/pipe/redirect_test.c
*
* Copyright (C) 2008-2009 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sched.h>
#include <semaphore.h>
#include <errno.h>
#include "pipe.h"
/****************************************************************************
* Definitions
****************************************************************************/
#define READ_SIZE 37
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
static sem_t g_rddone;
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: redirect_reader
****************************************************************************/
static int redirect_reader(int argc, char *argv[])
{
char buffer[READ_SIZE];
int fdin;
int fdout;
int ret;
int nbytes = 0;
printf("redirect_reader: started with fdin=%s\n", argv[1]);
/* Convert the fdin to binary */
fdin = atoi(argv[1]);
fdout = atoi(argv[2]);
/* Close fdout -- we don't need it */
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(fdin);
return 2;
}
/* Close the original file descriptor */
ret = close(fdin);
if (ret != 0)
{
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 */
ret = read(0, buffer, READ_SIZE);
if (ret < 0 )
{
fprintf(stderr, "redirect_reader: read failed, errno=%d\n", errno);
return 4;
}
else if (ret == 0)
{
break;
}
nbytes += ret;
/* Echo to stdout */
ret = write(1, buffer, ret);
if (ret < 0)
{
fprintf(stderr, "redirect_reader: read failed, errno=%d\n", errno);
return 5;
}
}
printf("redirect_reader: %d bytes read\n", nbytes);
ret = close(0);
if (ret != 0)
{
fprintf(stderr, "redirect_reader: failed to close fd=0\n");
return 6;
}
sem_post(&g_rddone);
printf("redirect_reader: Returning success\n");
return 0;
}
/****************************************************************************
* Name: redirect_writer
****************************************************************************/
static int redirect_writer(int argc, char *argv[])
{
int fdin;
int fdout;
int nbytes = 0;
int ret;
fprintf(stderr, "redirect_writer: started with fdout=%s\n", argv[2]);
/* Convert the fdout to binary */
fdin = atoi(argv[1]);
fdout = atoi(argv[2]);
/* Close fdin -- we don't need it */
ret = close(fdin);
if (ret != 0)
{
fprintf(stderr, "redirect_reader: failed to close fdin=%d\n", fdin);
return 1;
}
/* Re-direct the fdout to stdout */
ret = dup2(fdout, 1);
if (ret != 0)
{
fprintf(stderr, "redirect_writer: dup2 failed: %d\n", errno);
return 2;
}
/* Close the original file descriptor */
ret = close(fdout);
if (ret != 0)
{
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");
nbytes += printf("conceived and so dedicated, can long endure. We are met on a great battle-field of that war.\n");
nbytes += printf("We have come to dedicate a portion of that field, as a final resting place for those who here\n");
nbytes += printf("gave their lives that that nation might live. It is altogether fitting and proper that we\n");
nbytes += printf("should do this.\n");
nbytes += printf("\nBut, in a larger sense, we can not dedicate - we can not consecrate - we can not hallow - this ground.\n");
nbytes += printf("The brave men, living and dead, who struggled here, have consecrated it, far above our poor power\n");
nbytes += printf("to add or detract. The world will little note, nor long remember what we say here, but it can\n");
nbytes += printf("never forget what they did here. It is for us the living, rather, to be dedicated here to the\n");
nbytes += printf("unfinished work which they who fought here have thus far so nobly advanced. It is rather for us to\n");
nbytes += printf("be here dedicated to the great task remaining before us - that from these honored dead we take\n");
nbytes += printf("increased devotion to that cause for which they gave the last full measure of devotion - that we\n");
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");
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=1\n");
return 4;
}
fprintf(stderr, "redirect_writer: Returning success\n");
return 0;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: redirection_test
****************************************************************************/
int redirection_test(void)
{
const char *argv[3];
char buffer1[8];
char buffer2[8];
int readerid;
int writerid;
int filedes[2];
int ret;
sem_init(&g_rddone, 0, 0);
/* Create the pipe */
ret = pipe(filedes);
if (ret < 0)
{
fprintf(stderr, "redirection_test: pipe failed with errno=%d\n", errno);
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]);
readerid = task_create("redirect_reader", 50, CONFIG_EXAMPLES_PIPE_STACKSIZE, redirect_reader, argv);
if (readerid < 0)
{
fprintf(stderr, "redirection_test: Failed to create redirect_writer task: %d\n", errno);
return 1;
}
/* Start redirect_writer task */
printf("redirection_test: Starting redirect_writer task with fd=%d\n", filedes[1]);
writerid = task_create("redirect_writer", 50, CONFIG_EXAMPLES_PIPE_STACKSIZE, redirect_writer, argv);
if (writerid < 0)
{
fprintf(stderr, "redirection_test: Failed to create redirect_writer task: %d\n", errno);
ret = task_delete(readerid);
if (ret != 0)
{
fprintf(stderr, "redirection_test: Failed to delete redirect_reader task %d\n", errno);
}
return 2;
}
/* We should be able to close the pipe file descriptors now. */
if (close(filedes[0]) != 0)
{
fprintf(stderr, "pipe_main: close failed: %d\n", errno);
}
if (close(filedes[1]) != 0)
{
fprintf(stderr, "pipe_main: close failed: %d\n", errno);
}
if (ret != 0)
{
fprintf(stderr, "pipe_main: PIPE test FAILED (%d)\n", ret);
return 6;
}
/* Wait for redirect_writer thread to complete */
printf("redirection_test: Waiting...\n");
fflush(stdout);
sem_wait(&g_rddone);
printf("redirection_test: returning %d\n", ret);
return ret;
}
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