/*************************************************************************\
*                  Copyright (C) Michael Kerrisk, 2026.                   *
*                                                                         *
* This program is free software. You may use, modify, and redistribute it *
* under the terms of the GNU General Public License as published by the   *
* Free Software Foundation, either version 3 or (at your option) any      *
* later version. This program is distributed without any warranty.  See   *
* the file COPYING.gpl-v3 for details.                                    *
\*************************************************************************/

/* is_echo_inetd_sv.c

   An inetd-invoked implementation of the TCP "echo" service.

   Compare this program with is_echo_sv.c.
*/
#include <syslog.h>
#include "tlpi_hdr.h"

#define BUF_SIZE 4096

int
main(int argc, char *argv[])
{
    char buf[BUF_SIZE];
    ssize_t numRead;

    while ((numRead = read(STDIN_FILENO, buf, BUF_SIZE)) > 0) {
        if (write(STDOUT_FILENO, buf, numRead) != numRead) {
            syslog(LOG_ERR, "write() failed: %s", strerror(errno));
            exit(EXIT_FAILURE);
        }
    }

    if (numRead == -1) {
        syslog(LOG_ERR, "Error from read(): %s", strerror(errno));
        exit(EXIT_FAILURE);
    }

    exit(EXIT_SUCCESS);
}