# -*- tab-width: 4 -*- ;; Emacs
# vi: set filetype=sh tabstop=8 shiftwidth=8 noexpandtab :: Vi/ViM
############################################################ IDENT(1)
#
# $Title: dwatch(8) module for dtrace_proc(4) activity $
# $Copyright: 2014-2018 Devin Teske. All rights reserved. $
#
############################################################ DESCRIPTION
#
# Display process activity
#
############################################################ PROBE

case "$PROFILE" in
proc)
	: ${PROBE:=$( echo \
		proc:::create, \
		proc:::exec, \
		proc:::exec-failure, \
		proc:::exec-success, \
		proc:::exit, \
		proc:::signal-clear, \
		proc:::signal-discard, \
		proc:::signal-send )}
	;;
proc-signal)
	: ${PROBE:=$( echo \
		proc:::signal-clear, \
		proc:::signal-discard, \
		proc:::signal-send )}
	;;
proc-status)
	: ${PROBE:=$( echo \
		proc:::create, \
		proc:::exec, \
		proc:::exec-failure, \
		proc:::exec-success, \
		proc:::exit )}
	;;
*)
	: ${PROBE:=proc:::${PROFILE#proc-}}
esac

############################################################ ACTIONS

exec 9<<EOF
this int	sig;
this pid_t	pid;
this string	details;
this string	exec_arg0;

inline string probealias[string name] =
	name == "create" ?		"FORK" :
	name == "exec" ?		"EXEC" :
	name == "exec-failure" ?	"FAIL" :
	name == "exec-success" ?	"INIT" :
	name == "exit" ?		"EXIT" :
	name == "signal-clear" ?	"CLEAR" :
	name == "signal-discard" ?	"DISCARD" :
	name == "signal-send" ?		"SEND" :
	name;

$PROBE /* probe ID $ID */
{${TRACE:+
	printf("<$ID>");}
	this->details = "";
}

proc:::create /* probe ID $(( $ID + 1 )) */
{${TRACE:+
	printf("<$(( $ID + 1 ))>");
}
	$( pproc -P _create "(struct proc *)args[0]" )

	/* details = "pid <pid of args[0]> -- <proc args of args[0]>" */
	this->details = strjoin(
		strjoin("pid ", lltostr(this->pid_create)),
		strjoin(" -- ", this->args_create));
}

proc:::exec /* probe ID $(( $ID + 2 )) */
{${TRACE:+
	printf("<$(( $ID + 2 ))");}
	this->details = this->exec_arg0 = stringof(arg0);
}

proc:::exec-failure /* probe ID $(( $ID + 3 )) */
{${TRACE:+
	printf("<$(( $ID + 3 ))>");
}
	/* details = "<arg0 from proc:::exec>: <strerror of arg0> (<arg0>)" */
	this->details = strjoin(
		strjoin(this->exec_arg0, ": "),
		strjoin(strerror[(int)arg0],
			strjoin(" (", strjoin(lltostr((int)arg0), ")"))));
}

proc:::exec-success /* probe ID $(( $ID + 4 )) */
{${TRACE:+
	printf("<$(( $ID + 4 ))>");}
	this->details = this->args0;
}

proc:::exit /* probe ID $(( $ID + 5 )) */
{${TRACE:+
	printf("<$(( $ID + 5 ))>");}
	this->details = child_signal_string[(int)arg0];
}

proc:::signal-clear /* probe ID $(( $ID + 6 )) */
{${TRACE:+
	printf("<$(( $ID + 6 ))>");}
	this->pid = (pid_t)((ksiginfo_t *)args[1])->ksi_info.si_pid;
	this->sig = (int)arg0;
}

proc:::signal-discard, proc:::signal-send /* probe ID $(( $ID + 7 )) */
{${TRACE:+
	printf("<$(( $ID + 7 ))>");}
	this->pid = (pid_t)((struct proc *)args[1])->p_pid;
	this->sig = (int)arg2;
}

proc:::signal-clear,
proc:::signal-discard,
proc:::signal-send /* probe ID $(( $ID + 8 )) */
{${TRACE:+
	printf("<$(( $ID + 8 ))>");
}
	/* details = "<signal>[<num>] pid <pid>" */
	this->details = strjoin(strjoin(signal_string[this->sig], "["),
		strjoin(strjoin(lltostr(this->sig), "] pid "),
		lltostr(this->pid)));
}

proc:::signal-send, proc:::signal-discard /* probe ID $(( $ID + 9 )) */
{${TRACE:+
	printf("<$(( $ID + 9 ))>");
}
	$( pproc -P _signal "(struct proc *)args[1]" )

	this->details = strjoin(this->details,
		strjoin(" -- ", this->args_signal));
}
EOF
ACTIONS=$( cat <&9 )
ID=$(( $ID + 10 ))

############################################################ EVENT DETAILS

if [ ! "$CUSTOM_DETAILS" ]; then
exec 9<<EOF
	/*
	 * Print details
	 */
	printf("%s %s", probealias[probename], this->details);
EOF
EVENT_DETAILS=$( cat <&9 )
fi

################################################################################
# END
################################################################################