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#! stap -p2
global entry_time, my_count, my_fd, read_times
# future built-ins
function string (v) { return "" }
function hexstring (v) { return "" }
function trace (s) { return 0 }
probe begin /* kernel.syscall("read") */ {
$count=0 $timestamp=0 $fd=0
thread->entry_time = $timestamp # "macro" variable
thread->my_count = $count # function argument
thread->my_fd = $fd # function argument
trace ("my_count = " . string(thread->my_count) .
"my_fd = " . string(thread->my_fd))
}
probe end /* kernel.syscall("read").return */ {
$syscall_name="" $retvalue=0
if (thread->entry_time) {
read_times[$syscall_name] # variable from provider alias
+= $timestamp - thread->entry_time
}
trace ("syscall " . $syscall_name .
" return value = " .
hexstring ($retvalue)) # function pseudo-argument
}
probe end {
foreach (syscall in read_times) {
trace ("syscall " . syscall .
" total-time=" . string (read_times[syscall]))
}
}
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