[noPoll] nopoll_conn_read_pending doesn't seem to be working
Bill Goetz
bgoetz at store-intelligence.com
Tue Sep 15 05:30:38 CEST 2020
Hello Francis,
I have a hopefully quick question for you (or anyone else on this email thread if anyone is interested in replying). I have an application running on an embedded Linux Access Point that is crashing inside of nopoll_read(). Once thing I found was that it is always crashing at the SAME TIME that another Access Point has just SCP'ed a file to THIS Access Point using Dropbear. Both this application as well as Dropbear are using OpenSSL library version 1.1.
Even though Dropbear and the AP's firmware are using completely different sockets and shouldn't interfere with one another, it seems that's what is happening. BTW, the scp from the other AP DOES go through and Dropbear finishes completely.
ANY suggestions on how I should go about figuring out what's going on?
Sep 14 22:32:30 aap001067 authpriv.info dropbear[4802]: Child connection from 172.20.40.62:38430
Sep 14 22:32:31 aap001067 local5.info aap[989]: Locally roaming tag records: 2
Sep 14 22:32:35 aap001067 local5.info aap[989]: Locally roaming tag records: 2
Sep 14 22:32:35 aap001067 authpriv.notice dropbear[4802]: Pubkey auth succeeded for 'root' with key md5 b4:3b:c2:73:2c:dd:a4:cb:46:36:9c:9b:fc:ae:0f:95 from 172.20.40.62:38430
Sep 14 22:32:36 aap001067 authpriv.info dropbear[4802]: Exit (root): Exited normally
Sep 14 22:32:36 aap001067 user.warn kernel: Alignment trap: aap_bin (1037) PC=0x000446c4 Instr=0xe5823000 Address=0xfffffffe FSR 0x801
Sep 14 22:32:36 aap001067 local5.notice aap[989]: Got signal 11
Sep 14 22:32:36 aap001067 local5.notice aap[989]: [bt] Execution path:
Sep 14 22:32:36 aap001067 local5.notice aap[989]: [bt] /lib/libc.so.6(__default_sa_restorer_v2+0) [0x40446610]
Sep 14 22:32:36 aap001067 local5.notice aap[989]: [bt] ./aap_bin [0x446c4] - 0x0004457c __nopoll_conn_receive
Sep 14 22:32:36 aap001067 local5.notice aap[989]: [bt] ./aap_bin [0x46528] - 0x00046104 nopoll_conn_get_msg
Sep 14 22:32:36 aap001067 local5.notice aap[989]: [bt] ./aap_bin [0x47540] - 0x000472cc nopoll_conn_read
Sep 14 22:32:36 aap001067 local5.notice aap[989]: [bt] ./aap_bin [0x1c3f8] - 0x0001c2c0 ASG::ASGReadThread::ReadAll(unsigned char*, unsigned long, unsigned long*)
Sep 14 22:32:36 aap001067 local5.notice aap[989]: [bt] ./aap_bin [0x1d930] - 0x0001d89c ASG::ASGReadThread::_threadFunc(void*)
Sep 14 22:32:36 aap001067 local5.notice aap[989]: [bt] /lib/libpthread.so.0 [0x400fe5f4]
Sep 14 22:32:36 aap001067 local5.notice aap[989]: [bt] /lib/libc.so.6(clone+0x88) [0x404de368]
root at aap001067:~#
Much thanks,
Bill
________________________________
From: Francis Brosnan Blázquez <francis.brosnan at aspl.es>
Sent: Sunday, August 23, 2020 11:34 PM
To: Bill Goetz <bgoetz at store-intelligence.com>
Cc: nopoll at lists.aspl.es <nopoll at lists.aspl.es>
Subject: Re: [noPoll] nopoll_conn_read_pending doesn't seem to be working
Hello Bill,
Thanks for using noPoll. It is great to see it is useful.
About your question, we have to strengthen nopoll_conn_read_pending documentation to reflect
how to use it (expected way of working).
It is a function designed to be used *after* you call to nopoll_conn_read so you can get quick
indication if there are pending data that can be consumed, especially, when you are doing async I/O,
so you can do another nopoll_conn_read without blocking and getting data.
Here you have an example of a library using nopoll_conn_read in combination with nopoll_conn_read_pending:
https://github.com/ASPLes/libvortex-1.1/blob/master/web-socket/vortex_websocket.c#L404
Best Regards,
El vie, 21-08-2020 a las 19:20 +0000, Bill Goetz escribió:
Hello,
So I'm using your nopoll WebSocket library, which I think is really solid!
I am having a problem though with nopoll_conn_read_pending() not returning anything > 0.
Here's a small code snip-it. It's never getting to either of the printf's after the nopoll_conn_read_pending() call.
I also know that the server this code is connected to IS writing data on this socket because if I comment out the call to nopoll_conn_read_pending(), data IS read during the nopoll_conn_read() call.
ANY help would be greatly appreciated!
printf("before nopoll_conn_read_pending\n");
while ( 1 ) {
// printf("inside while before nopoll_conn_read_pending\n");
retStatus = nopoll_conn_read_pending (g_pWebConn);
if (retStatus > 0) {
printf("AHA! retStatus = %d\n", retStatus);
break;
}
}
printf("after nopoll_conn_read_pending retStatus = %d\n", retStatus);
if ( retStatus > 0 ) {
n_read_int = nopoll_conn_read (g_pWebConn, (char *)(buf + n_read_sum), n_to_read, nopoll_false, 1000);
} else n_read_int = retStatus;
Regards,
Bill Goetz
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