disclaimer: I am a dtrace beginner.
A common convention in Umix is that a process rereads its
configuration files when sent
a SIGHUP signal. So I thought smart to write a dtrace script (shown
below) that prints the files opened
by a process that receive any signal. I starts the said script, next
I do a "sudo killall -1 httpd" and I get nothing except lines like :
trace: error on enabled probe ID 2 (ID 17602: syscall::open:entry):
invalid user access in predicate at DIF offset 4
dtrace: error on enabled probe ID 3 (ID 17603: syscall::open:return):
invalid user access in predicate at DIF offset 4
I am using leopard.
What am I doing wrong?
#! /usr/sbin/dtrace -s
proc::postsig:signal-handle {
this->pid = pid;
printf("%s with pid %d got a signal %d\n", execname, pid, arg0);
}
syscall::open:entry /this->pid == pid/ { this->file = copyinstr(arg0); }
syscall::open:return /this->pid == pid/ { printf( "%s %s %d\n",
execname, this->file, arg0); }
--
cognominal stef
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