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// Copyright 2003 John Kasunich
//
// 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 of the License, 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
/*
fifousr.c - user-side FIFO code
*/
#include <stdio.h>
#include <signal.h>
#include <setjmp.h>
#include <sys/time.h>
#include "rtapi.h"
#include "common.h" /* FIFO_KEY, FIFO_SIZE */
static int module;
static jmp_buf env;
static void quit(int sig)
{
longjmp(env, 1);
}
int main()
{
int fifo;
char buffer[FIFO_SIZE + 1];
int nchars;
int retval;
module = rtapi_init("FIFO_USR");
if (module < 0) {
rtapi_print_msg(RTAPI_MSG_ERR,
"fifousr main: rtapi_init returned %d\n", module);
return -1;
}
/* open the fifo */
fifo = rtapi_fifo_new(FIFO_KEY, module, FIFO_SIZE, 'R');
if (fifo < 0) {
rtapi_print_msg(RTAPI_MSG_ERR,
"fifousr main: rtapi_fifo_new returned %d\n", fifo);
rtapi_exit(module);
return -1;
}
if (1 == setjmp(env))
goto END;
signal(SIGINT, quit);
printf("waiting for fifo data, ctrl-C to quit\n");
while (1) {
nchars = rtapi_fifo_read(fifo, buffer, FIFO_SIZE);
if (nchars <= 0) {
rtapi_print_msg(RTAPI_MSG_ERR,
"fifousr main: rtapi_fifo_read returned %d\n", nchars);
} else {
buffer[nchars] = '\0';
rtapi_print_msg(RTAPI_MSG_INFO,
"fifousr main: read %d chars: '%s'\n", nchars, buffer);
}
}
END:
rtapi_print_msg(RTAPI_MSG_INFO, "shutting down\n");
retval = rtapi_fifo_delete(fifo, module);
if (retval < 0) {
rtapi_print_msg(RTAPI_MSG_ERR,
"fifousr main: rtapi_fifo_delete returned %d\n", retval);
rtapi_exit(module);
return -1;
}
return rtapi_exit(module);
}
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