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STRERROR()

Syntax

STRERROR( [ <expN> ] )

Description

The STRERROR() function returns a string describing the last operating system error message. If the optional error number is specified then the related operating system error message will be returned.

Example

mqdes=mqcreate("/myqueue", 2)
 if (mqdes < 0)
     messagebox(strerror()+",errno="+alltrim(str(error())))
    return
 endif
 rc = mqsend(mqdes, "Test message")
 if (rc < 0)
     messagebox(strerror()+",errno="+alltrim(str(error())))
    return
 endif
 mqclose(mqdes)

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This MSDN article provides good details about IE CSS compatibility issues.
http://msdn.microsoft.com/en-us/library/cc351024(VS.85).aspx
 
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Many motherboards nowadays have integrated gigabit ethernet that use the Realtek NIC chipset.

The Realtek r8168B network card does not work out of the box in Redhat/Centos 5.3: instead of loading the r8168 driver, modprobe loads the r8169 driver, which is broken as can be seen with ifconfig which shows large amounts of dropped packets. A solution is to download the r8168 driver from the Realtek website and install it using the following steps:

Check whether the built-in driver, r8169.ko (or r8169.o for kernel 2.4.x), is installed.

# lsmod | grep r8169

If it is installed remove it.

# rmmod r8169

Download the R8168B linux driver from here into /root.

Unpack the tarball :

# cd /root
# tar vjxf r8168-8.012.00.tar.bz2

Change to the directory:

# cd r8168-8.012.00

If you are running the target kernel, then you should be able to do :

# make clean modules   
# make install
# depmod -a
# insmod ./src/r8168.ko (or r8168.o in linux kernel 2.4.x)

make sure modprobe knows not to use r8169, and that depmod doesn’t find the r8169 module.

# echo "blacklist r8169" >> /etc/modprobe.d/blacklist
# mv /lib/modules/`uname -r`/kernel/drivers/net/r8169.ko   \ /lib/modules/`uname -r`/kernel/drivers/net/r8169.ko.bak

You can check whether the driver is loaded by using the following commands.

# lsmod | grep r8168
# ifconfig -a

If there is a device name, ethX, shown on the monitor, the linux driver is loaded. Then, you can use the following command to activate it.

# ifconfig ethX up

After this you should not see any more dropped packets reported.

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When using Recital Web you can maintain the exact state of each cursor between pages like this.

On entry to the .rsp page.

IF type( _session["state"] ) != "U"
    m_state = _session["state"]
    RESTORE DATASESSION FROM m_state
ELSE
    // open up your tables for the first time 
ENDIF

On exit of the .rsp page.
SAVE DATASESSION TO m_state
_SESSION["state"] = m_state
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In an interesting article at Linux Magazine, Sam Ockman discusses the origin of the term "Open Source". Check it out here.
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I am pleased to finally report that the Centos release of Redhats 5.3 has been built and is available for download from http://www.centos.org/

The highlights of this release can be found at the following URL: http://www.redhat.com

The main areas of interest in my opinion excluding critical secirty fixes are:

  • Updated hardwaresupport support for the new Intel Core i7 (Nehalem) chips
  • Beefed up virtualiseation support increasing CPU and Ram limits of Virtual machines.
  • Inclusion of the fully open sourced OpenJDK. This makes Red Hat Enterprise Linux 5.3 the first enterprise-ready solution with a fully open source Java stack when combined with JBoss Enterprise Application Platform.


For those who already have Centos 5.2 installed you can simply receive the update via Yum.

Before you do the following, check that  you do not have 3rd party repo's and the Centos-testing repo enabled.

You can display the currently enabled repo's using the following command.

$ yum repolist



Then as root at the prompt type:

$ yum update

 

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Mac OS X leopard supports Universal Binaries so executables and dynamic libraries can be run on multiple architectures. A good example of this is the default apache install on Mac OS X. 
In order to compile apache modules for this architecture you must use the following flags when configuring the apache install.
 ./configure CFLAGS='-arch x86_64' APXSLDFLAGS='-arch x86_64' --with-apxs=/usr/sbin/apxs
Then you must pass the these additional flags to the apxs command in order to generate a Universal Binary shared module.
-Wl,-dynamic -Wl,'-arch ppc' -Wl,'-arch ppc64' -Wl,'-arch i386' -Wl,'-arch x86_64' 
-Wc,-dynamic -Wc,'-arch ppc' -Wc,'-arch ppc64' -Wc,'-arch i386' -Wc,'-arch x86_64' 
If you then do a file command on the shared module it should return; 
$ file mod_recital.so 
mod_recital2.2.so: Mach-O universal binary with 4 architectures 
mod_recital2.2.so (for architecture ppc7400): Mach-O bundle ppc 
mod_recital2.2.so (for architecture ppc64): Mach-O 64-bit bundle ppc64 
mod_recital2.2.so (for architecture i386): Mach-O bundle i386 
mod_recital2.2.so (for architecture x86_64): Mach-O 64-bit bundle x86_64
The apache module files are stored in the /usr/libexec/apache2/ directory on a default apache install on the Mac and the configuration file is /private/etc/apache2/httpd.conf
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MQCURMSGS()

Syntax

MQCURMSGS( <expN> )

Description

The MQCURMSGS() function returns the current number of unread messages in the queue specified by <expN>

Example

mqdes=mqopen("/myqueue")
if (mqdes < 0)
   messagebox(strerror()+",errno="+alltrim(str(error())))
   return
endif
do while (mqcurmsgs(mqdes) > 0)
   mstr=mqreceive(mqdes)
   if (empty(mstr))
      messagebox(strerror()+",errno="+alltrim(str(error())))
      return
   endif
   messagebox(mstr)
end do
mqclose(mqdes)

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We are pleased to announce the release of Recital 10.0.2.

Here is a brief list of features and functionality that you will find in the 10.0.2 release. 

  • New commands
    SAVE/RESTORE DATASESSION [TO variable]
    CONNECT "connectString"
    DISCONNECT 
  • New functions (OData compatible)
    startsWith(haystack as character, needle as character)
    endsWith(haystack as character, needle as character)
    indexOf(haystack as character, needle as character)
    substringOf(haystack as character, needle as character)
    concat(expC1, expC2)
  • New system variables
    _LASTINSERTEDSYNCNUM
  • Enhanced commands
    Added CONNSTRING "connectingString" to the USE command to connect to remote servers (Recital, MySQL, PostgreSQL, Oracle, ODBC)
  • Further SQL query optimizer improvements to boost performance
  • Performance improvements in Recital Web
  • Forced all temporary files into temp directory (improves performance when local tmpfs is used as temp directory and reduces network i/o)
  • Fixed cookie and session variable problems in Recital Web
  • Fixed problem with temporary files being left after some server queries involving memos and object data types
  • Improved performance of the Windows ODBC driver
  • Fixed a security flaw in Recital Web
  • Fixed all reported bugs 
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When stress testing our loadbalancer, i was unable to get more than 20 reliable ssh connections. The following error would be reported.

ssh_exchange_identification: Connection closed by remote host

The resolution for this is quite simple.

Edit the /etc/ssh/sshd_config file and increase the MaxStartups. On my server i set this to 200.

Edit /etc/sysctrl.conf and add the following line:

net.core.netdev_max_backlog = 3000

Then apply this change:

# sysctl -p

 

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