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#! /bin/sh
# suppress some run-time errors here for cleaner output
//bin/true && exec stap --suppress-handler-errors --skip-badvars $0 ${1+"$@"}
/* configuration options; set these with stap -G */
global follow_fork = 0 /* -Gfollow_fork=1 means trace descendant processes too */
global timestamp = 1 /* -Gtimestamp=0 means don't print a syscall timestamp */
global elapsed_time = 0 /* -Gelapsed_time=1 means print a syscall duration too */
global thread_argstr%
global thread_time%
global syscalls_nonreturn[2]
probe begin
{
/* list those syscalls that never .return */
syscalls_nonreturn["exit"]=1
syscalls_nonreturn["exit_group"]=1
}
function filter_p()
{
if (target() == 0) return 0; /* system-wide */
if (!follow_fork && pid() != target()) return 1; /* single-process */
if (follow_fork && !target_set_pid(pid())) return 1; /* multi-process */
return 0;
}
probe nd_syscall.*
{
if (filter_p()) next;
thread_argstr[tid()]=argstr
if (timestamp || elapsed_time)
thread_time[tid()]=gettimeofday_us()
if (name in syscalls_nonreturn)
report(name,argstr,"")
}
probe nd_syscall.*.return
{
if (filter_p()) next;
report(name,thread_argstr[tid()],retstr)
}
function report(syscall_name, syscall_argstr, syscall_retstr)
{
if (timestamp || elapsed_time)
{
now = gettimeofday_us()
then = thread_time[tid()]
if (timestamp)
prefix=sprintf("%s.%06d ", ctime(then/1000000), then%1000000)
if (elapsed_time && (now>then)) {
diff = now-then
suffix=sprintf(" <%d.%06d>", diff/1000000, diff%1000000)
}
delete thread_time[tid()]
}
/* add a thread-id string in lots of cases, except if
stap strace.stp -c SINGLE_THREADED_CMD */
if (tid() != target()) {
prefix .= sprintf("%s[%d] ", execname(), tid())
}
printf("%s%s(%s) = %s%s\n",
prefix,
syscall_name, syscall_argstr, syscall_retstr,
suffix)
delete thread_argstr[tid()]
}
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