I'm trying to pass a message from user space to Xenomai and it doesn't seem
to be working. I keep getting an error when attempting to write to the pipe
in user space.
rt_pipe_write error
: Cannot allocate memory
This happens whether I use posix calls or real time calls.
If I change the poolsize to 0 for allocation from the heap, writes no longer
error out but the data is not received in real time space.
Does this work for anyone else? Anyone have any ideas I could try?
thx,
NZG
code specifics follow...................................................
3 differen POOLSIZE attempts
**************************************************
#define KOMMANDBUFFER 100
//#define POOLSIZE_CONTROL (sizeof(kommand_t)*KOMMANDBUFFER)
//#define POOLSIZE_CONTROL 0
#define POOLSIZE_CONTROL 1024
real-time thread
***********************************
if((err=rt_pipe_create (p, name, P_MINOR_AUTO, POOLSIZE_CONTROL))!=0){
error(0,-err, "could not create rt pipe");
return err;
}
/**
* retrieve a message from the message buffer
* and updates the kommand structure passed to it.
* @returns the type of command retrieved.
*
*/
static inline int getkommand(kommand_t *k){
int err;
err = rt_pipe_read(&command_pipe,k,sizeof(kommand_t),TM_NONBLOCK);
if(err<0)error(0,-err, "rt_pipe_read error\n");
return k->type;//return the type of message
}
while(getkommand(&kommand)!=KILLCYCLE);
user space using real time calls
***********************************
err=rt_pipe_write(&command_pipe, &k,sizeof(kommand_t),P_NORMAL);
if(err<0)error(0,-err, "rt_pipe_write error\n");
alternateuser space using posix calls
***********************************
int cfd = open(COMMANDPIPE, O_RDWR);
if(cfd<0){
printf("can't open %s (%s)\n",COMMANDPIPE, strerror(-cfd));
fflush(stdout);
return;
}
err=write(cfd,&k,sizeof(kommand_t));
if(err==0)printf("couldn't write to %s\n",COMMANDPIPE);
if(err<0)printf("err writing to %s (%s)\n",COMMANDPIPE,
strerror(errno));
if(close(cfd)<0)printf("couldn't close %s\n",COMMANDPIPE
-------------------------------------------------------
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