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/* xj-five - message queues
Copyright (C) 2006 Robin Gareus
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., 675 Mass Ave, Cambridge, MA 02139, USA.
$Id: xj-five.c,v 1.12 2006/09/09 10:55:12 rgareus Exp $
*/
#include "xjadeo.h"
#ifdef HAVE_MQ
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdarg.h>
#include <mqueue.h>
#include <errno.h>
extern int errno;
extern int loop_run; // display active
extern int loop_flag;// program active
extern int want_quiet;
extern int want_verbose;
/* see xjremote.c for information on this one */
typedef struct {
int cmd;
char m[MQLEN];
} mqmsg;
/* some static globals */
mqd_t mqfd_r = -1;
mqd_t mqfd_s = -1;
size_t mq_msgsize_r;
char *msg_buffer;
int priority_of_msg = 20;
int mymq_init(char *id) {
struct mq_attr mqat;
// TODO use session ID in path.
// implement session authenticaion? - allow user to specify umask.
char qname[64];
snprintf(qname,64,"/xjadeo-request%s%s", id?"-":"", id?(char*)id:"");
mqfd_r = mq_open(qname, O_RDONLY | O_CREAT | O_EXCL | O_NONBLOCK, S_IRWXU , NULL);
if (mqfd_r == -1) {
perror("mq_open failure:");
if (errno == EEXIST)
fprintf(stderr,"note: use `xjremote -u` to unlink old queues\n");
return(1);
}
if (mq_getattr(mqfd_r, &mqat) == -1) {
perror("mq_getattr error:");
return(1);
}
mq_msgsize_r = mqat.mq_msgsize;
msg_buffer = malloc(mq_msgsize_r);
snprintf(qname,64,"/xjadeo-reply%s%s", id?"-":"", id?(char*)id:"");
mqfd_s = mq_open(qname, O_WRONLY | O_CREAT | O_EXCL | O_NONBLOCK, S_IRWXU , NULL);
if (mqfd_s == -1) {
perror("mq_open failure:");
if (errno == EEXIST)
fprintf(stderr,"note: use `xjremote -u` to unlink old queues\n");
mq_close(mqfd_r);
snprintf(qname,64,"/xjadeo-request%s%s", id?"-":"", id?(char*)id:"");
mq_unlink(qname);
return(1);
}
while (mq_receive(mqfd_r, msg_buffer, mq_msgsize_r, 0) > 0) ;
#if 0
{ // FLUSH the output Queue
mqd_t mqfd_sx = mq_open(qname, O_RDONLY | O_NONBLOCK, S_IRWXU , NULL);
while (mq_receive(mqfd_sx, msg_buffer, mq_msgsize_r, 0) > 0) ;
mq_close(mqfd_sx);
}
#endif
if (!want_quiet)
printf("activated remote interface. mqID:%s\n",id?id:"[default]");
return(0);
}
void mymq_close(void) {
if(mqfd_s == -1 || mqfd_r==-1) {
return;
}
if (mq_close(mqfd_r) == -1)
perror("mq_close failure on mqfd_r");
if (mq_close(mqfd_s) == -1)
perror("mq_close failure on mqfd_s");
//FIXME : use mqID
// snprintf(qname,64,"/xjadeo-request%s%s", id?"-":"", id?(char*)id:"");
if (mq_unlink("/xjadeo-request") == -1)
perror("mq_unlink failure");
if (mq_unlink("/xjadeo-reply") == -1)
perror("mq_unlink failure");
if (!want_quiet)
printf("closed MQ remote control.\n");
mqfd_s=mqfd_r=-1;
}
/* read message from queue and store it in data.
* data needs to be 'NULL' (ignore msg) or point to a valid char[MQLEN].
* return values 0: no message in queue
* -1: error
* >0: data bytes in message.
*/
int mymq_read(char *data) {
mqmsg *mymsg;
int num_bytes_received = mq_receive(mqfd_r, msg_buffer, mq_msgsize_r, 0);
if (num_bytes_received == -1 && errno==EAGAIN) return (0);
if (num_bytes_received == -1) {
perror("mq_receive failure on mqfd");
usleep(40000);
return (-1);
}
if (num_bytes_received != sizeof(mqmsg) ) {
fprintf(stderr,"MQ: received garbage message\n");
return (-1);
}
mymsg = (mqmsg*) &msg_buffer[0];
if (data) strncpy(data,mymsg->m,MQLEN);
data[MQLEN-1]=0;
return (strlen(data));
}
void mymq_reply(int rv, char *str) {
int retry=5;
static int retry_warn=1;
mqmsg myrpy = {1, "" };
if (mqfd_s== -1) return;
myrpy.cmd= rv;
snprintf(myrpy.m,MQLEN,"%s\n",str);
// until we implement threads we should not waste time trying to re-send..
// mq_timedsend() might be an alternative..
while (retry > 0) {
int rv=mq_send(mqfd_s, (char*) &myrpy, sizeof(mqmsg), priority_of_msg);
if(!rv) break;
retry--;
usleep(20);
}
if (retry==0 && retry_warn) { fprintf(stderr,"DROPPED REMOTE MESSAGE\n"); retry_warn=0; }
}
#endif /* HAVE_MQ */
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