10-11-2005
how to prevent deadlock on this...
I am using linux termios structure to configure serial port and read the port by read function. For some reason, if I read the whole buffer, almost every time the buffer does not contain the correct reply message sequence from a device sending reply to my linux PC. So I use "while(!read_start(fd,0x01));" to wait the first legal byte in the reply and read byte by byte. The problem is sometime the user forget to power on the device so it will cause deadlock. I am no expert in linux. Can someone give suggestion about how to: set a timer and if time out, the current program will be killed or exit incorrectly while waiting the first byte?
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LEARN ABOUT DEBIAN
ekeyd-egd-linux
ekey-egd-linux(8) System Manager's Manual ekey-egd-linux(8)
NAME
egd-linux - EGD Entropy Daemon
SYNOPSIS
ekey-egd-linux [ -H hostip ] [ -p portno ] [ -b blocks ] [ -s shannons ] [ -D pidfile ] [ -r time ] [ -v ] [ -h ]
DESCRIPTION
ekey-egd-linux is a daemon which connects to an EGD server and places the read entropy in the kernels pool.
OPTIONS
-H hostip
Set the host IP address to connect to.
-p portno
Set the port number to connect to.
-b blocks
Set the number of 1024 bit blocks to request each time.
-s shannons
Set the number of shannons per byte.
-D pidfile
Specify the name and path of the file used to record the ekey-egd-linux process ID.
-r time
Set the time between reconnect attempts. The default (0) causes the daemon to exit immediately after the initial connection attempt
and no additional connection attempts are made. A non zero value set is the number of seconds the daemon will wait between connec-
tion attempts.
-h Print the usage text and exit.
-v Print the version number and exit.
SEE ALSO
ekeyd(8), ekey-rekey(8), ekey-setkey(8)
AUTHOR
Copyright (C) 2009 Simtec Electronics. All rights reserved.
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MER-
CHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
19th July 2009 ekey-egd-linux(8)