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diskdevstat: cmdline error handling

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This commit is contained in:
Jan Vcelak 2012-03-05 08:45:50 +01:00
parent 3b10ac690b
commit 81590cf770
1 changed files with 20 additions and 12 deletions
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32
contrib/diskdevstat
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@ -1,13 +1,4 @@
#!/usr/bin/stap
#
# diskdevstat: A simple systemtap script to record harddisk activity
# of processes and display statistics for read/write operations
#
# Usage: diskdevstat [Update interval] [Total duration] [Display histogram at the end]
#
# Update interval and total duration are in seconds. Display histogram only requires a
# 3rd option to exist to be enabled.
#
# Copyright (C) 2008, 2009 Red Hat, Inc.
# Authors: Phil Knirsch
#
@ -31,6 +22,18 @@
global ifavg, iflast, rtime, interval, duration, histogram
function help()
{
print(
"A simple systemtap script to record harddisk activity of processes and display\n"
"statistics for read/write operations.\n\n"
"usage: diskdevstat [update-interval] [total-duration] [display-histogram]\n\n"
" update-interval in seconds, the default is 5\n"
" total-interval in seconds, the default is 86400\n"
" display-histogram anything, unset by default\n"
);
}
probe begin
{
rtime = 0;
@ -38,9 +41,14 @@ probe begin
duration = 86400;
histogram = 0;
%( $# > 0 %? interval = $1; %)
%( $# > 1 %? duration = $2; %)
%( $# > 2 %? histogram = 1; %)
%( $# > 0 %? interval = strtol(@1,10); %)
%( $# > 1 %? duration = strtol(@2,10); %)
%( $# > 2 %? histogram = 1; %)
if ($# >= 4 || interval <= 0 || duration <= 0) {
help();
exit();
}
}
probe vfs.write