04-03-2007
void main() is a terrible idea... noticed it on your link.
10 More Discussions You Might Find Interesting
1. Programming
Dear Reader,
I'm in a multiprocess environment working with shared mem and semaphores as mutex.. The problem is -- If one of the process hooked up with the semaphore and accessing the shared mem, terminates abruptly ( or got killed ), other process which are in want of the semaphore are... (1 Reply)
Discussion started by: joseph_shibu
1 Replies
2. UNIX for Dummies Questions & Answers
Hi all,
I am using HP 10.20 on A 9000/785. My question is:
If I am the only person logged in as root at the moment, how many "semaphore proccesses" should I have?? Is it only one, or it is relevant to other system proccesses?
Here is what I get listing the current semaphores
# ipcs -sp... (1 Reply)
Discussion started by: guest100
1 Replies
3. Programming
Hi there,
Could someone please confirm which POSIX semaphore routines should be used for a multiprocess (and not multithreaded) environment?
sys/sem.h definitely works. but the routines, semget, semctl, semop are pretty unwieldy. So, I am looking for an easier way out.
From the man pages... (2 Replies)
Discussion started by: qntmteleporter
2 Replies
4. Shell Programming and Scripting
Hi Friends,
If i execute this command it comes back with 300 lines:
ipcs|grep cerebrus >>> i would like to clear the semaphores but ipcrm can remove one id at a time. is there a quicker way of removing semaphores maybe using awk?
Regards, (1 Reply)
Discussion started by: kekanap
1 Replies
5. UNIX for Advanced & Expert Users
Hello, first of all I apologize if this thread is not in the correct section of this forum, but this one just seemed the most appropriate.
The question I have does not concern Unix specifically, it applies to virtually any OS, however it is in Unix where I learned about this problem.
So, the... (8 Replies)
Discussion started by: Watto86
8 Replies
6. Programming
Hello,
Iam trying to implement the sleeping barber problem using semaphores and running on UNIX machine. Iam linking it to the thread libraries :
bash-2.03$ g++ sleepingBarber.cpp -lpthread -o sleeping
but when i execute it i get the following error:
bash-2.03$ sleeping
Starting Program... (4 Replies)
Discussion started by: mohit.choudhary
4 Replies
7. Programming
Hello,
I was doing an exercise of semaphores and shared memory, namely the barbers:
-B number of barbers
-S number of chairs
-C number of customers.
I have done already and I compiled the code, but when run I get an error segment. Can not be and it took several days.
If anyone sees the error... (2 Replies)
Discussion started by: ciudadwifi
2 Replies
8. UNIX for Dummies Questions & Answers
I am having problem with semaphores. I am trying to protect line where process prints so that every process with print in proper order.This is the code..
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/ipc.h>
#include <sys/sem.h>
#include <sys/types.h>
union... (3 Replies)
Discussion started by: joker40
3 Replies
9. Programming
Hello Everybody,
I am building a server. this server contains some data. Clients may modify this data or read this data.
If a client is reading the data and at the same time another client is modifying the data then at this case the reading client may read some false data (some old mixed with... (1 Reply)
Discussion started by: Omar_Mokhtar
1 Replies
10. Solaris
Hi,
Can somebody please explain me what semaphores are? there purpose? and there effects?
Thanks in advance:) (0 Replies)
Discussion started by: Laxxi
0 Replies
LEARN ABOUT FREEBSD
hcsecd
HCSECD(8) BSD System Manager's Manual HCSECD(8)
NAME
hcsecd -- control link keys and PIN codes for Bluetooth devices
SYNOPSIS
hcsecd [-dh] -f configfile
DESCRIPTION
The hcsecd daemon controls link keys and PIN codes for Bluetooth devices. It opens a raw HCI socket and listens for Link_Key_Request,
PIN_Code_Request and Link_Key_Notification HCI events.
Once a Link_Key_Request or PIN_Code_Request HCI event is received, the daemon scans the configuration file for a matching entry. The remote
device BD_ADDR is used as a key. If no matching entry was found, the default entry will be used. If no default entry was found then it is
assumed that no link key and no PIN code exists. For any given entry, the link key takes precedence over the PIN code. If a link key was
not specified, the device must generate the link key from the PIN code. If an entry was found and the link key (or PIN code) exists, the
Link_Key_Request_Reply (or PIN_Code_Request_Reply) command will be sent back to the device. Otherwise, the Link_Key_Request_Negative_Reply
(or PIN_Code_Request_Negative_Reply) command will be sent back to the device.
The hcsecd daemon also handles HCI Link_Key_Notification events and caches link keys created from the PIN codes in memory. To preserve link
keys between restarts the hcsecd daemon dumps link keys for all entries in the /var/db/hcsecd.keys link keys file. If it exists, the link
keys file gets processed by the hcsecd daemon after it processes its main configuration file. The link keys file gets written every time the
hcsecd daemon shuts down gracefully. It is possible to force the hcsecd daemon to re-read its main configuration file and dump the link keys
file by sending the HUP signal to the hcsecd process. The user is expected to not modify the link keys file by hand.
The command line options are as follows:
-d Do not detach from the controlling terminal.
-f configfile
Specify the name of the configuration file. The default is /etc/bluetooth/hcsecd.conf.
-h Display usage message and exit.
FILES
/etc/bluetooth/hcsecd.conf
/var/db/hcsecd.keys
/var/run/hcsecd.pid
SEE ALSO
ng_btsocket(4), ng_hci(4), hcsecd.conf(5), hccontrol(8), hcseriald(8)
AUTHORS
Maksim Yevmenkin <m_evmenkin@yahoo.com>
BUGS
Currently there is no way to select the link key or the PIN code based on which local device received the request. Everything is based on
the remote device BD_ADDR. An interface for external helpers to obtain link keys and PIN codes is missing.
BSD
November 16, 2002 BSD