OK, y'all convinced me that always using a 1M buffer for vmcp is not the
best idea. I appreciate all the feedback.
Here's my first take at a bash function to retry a vmcp command with a few
boundary test cases:
# cat testvmcp
#!/bin/bash
function zVerbose
{
echo "$@"
}
#+--------------------------------------------------------------------------+
function zCPcmd
# invoke a CP command with the vmcp module/command
# Args 1-n: the command to issue
# Return: the CP return code (not the vmcp rc)
#+--------------------------------------------------------------------------+
{
: SOURCE: ${BASH_SOURCE}
: STACK: ${FUNCNAME[@]}
local CPrc=0 # assume CP command succeeds
local CPout # CP output
zVerbose "Invoking: $vmcpCmd $@"
CPout=`$vmcpCmd $@ 2>&1` # run the CP command
local rc=$?
if [ "$rc" = 2 ]; then # output buffer overflow
local bytes=`echo $CPout | awk -F'(' '{print $2}' | awk '{print $1}'`
if [[ "$bytes" -gt 1048576 ]]; then # output too large
zVerbose "Error: output of $bytes bytes larger than 1 MB"
return 2
fi
zVerbose "Warning: increasing vmcp buffer size to $bytes bytes and
trying again"
CPout=`$vmcpCmd --buffer=$bytes $@ 2>&1`
local rc2=$?
if [ $rc2 != 0 ]; then # capture the CP return code
after "#"
CPrc=`echo $CPout | grep "Error: non-zero CP" | awk -F# '{print $2}'`
fi
elif [ $rc != 0 ]; then # capture the CP return code
after "#"
CPrc=`echo $CPout | grep "Error: non-zero CP" | awk -F# '{print $2}'`
fi
zVerbose "CP output:" # show the output in verbose mode
zVerbose "$CPout" # show the output in verbose mode
zVerbose "CP return code: $CPrc" # show the CP return code in
verbose mode
return $CPrc # return code from CP
} # zCPcmd()
# main
vmcpCmd="/sbin/vmcp"
zCPcmd "Q DASD DETAILS 0000-07FF"
echo
zCPcmd "Q DASD DETAILS 0000-FFFF"
echo
zCPcmd "NOT A CP COMMNAD"
Here's a test of running it:
# testvmcp
Invoking: /sbin/vmcp Q DASD DETAILS 0000-07FF
Warning: increasing vmcp buffer size to 109568 bytes and trying again
CP output:
HCPQDD040E Device 0000 does not exist
HCPQDD040E Device 0001 does not exist
...
HCPQDD040E Device 07FF does not exist
Error: non-zero CP response for command 'Q DASD DETAILS 0000-07FF': #40
CP return code: 40
Invoking: /sbin/vmcp Q DASD DETAILS 0000-FFFF
Error: output of 2577330 bytes larger than 1 MB
Invoking: /sbin/vmcp NOT A CP COMMNAD
CP output:
Error: non-zero CP response for command 'NOT A CP COMMNAD': #1
CP return code: 1
-Mike M
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