On Mon, May 9, 2011 at 7:28 PM, Dave Singer <dave.dorasin...@gmail.com>wrote:
> Brett, > > In your perl app are you starting and forking/threading the read before > print FIFO ":uptime:reply_fifo\n"; > ? Dave, I tried all sorts of ways. I'm pretty sure my problem comes down to some failicy in how I'm performing my open statement to write to the opensips fifo. My first attempt was linearly: 1. Open Reader 2. Open Writer 3. Write fifo command to writer (/tmp/opensips_fifo) 4. Loop over Reader filehandle until I get something Because of the way fifos work, this naturally blocks on the reader and never makes it to the writer. This is verified by administering an "echo" to the fifo with a valid command and everyone wakes up (and works properly) Second attempt was forking 1. Open Reader 2. Sleep 5 seconds 3. Fork 4. Fork Opens Writer 5. Fork writes to writer (/tmp/opensips_fifo) 6. Reader in loop looking for data from filehandle This also blocks on the reader. From what I can see, it doesn't appear that anything ever gets written (at least not properly) to /tmp/opensips_fifo. I've tried opening it with > and >. I've also tried explicit sysopen calls for write only and a few other variants. None of them worked Next I tried the above scenario, but I wrote another perl script that did nothing but open /tmp/opensips_fifo and wrote to it.. That didn't work either. That was running on another terminal altogether. So no backgrounding funny business here.. Last attempt was forking with a system call. 1. Open Reader 2. Fork 3. Fork executes system call to `echo` command to /tmp/opensips_fifo 4. Reader in loop looking for data from filehandle 5. Reader returns result from opensips *SUCCESS* That last variant works over and over... Of course, this issue above is notably a different issue than my original posting which is really about the fragility of the fifo itself. If given improper commands it tends to lock up (just the fifo, nothing else). If you have any ideas on what to do here, I'd appreciate it. :) Thanks! -Brett
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