The software described in this documentation is either in Extended Support or Sustaining Support. See https://www.oracle.com/us/support/library/enterprise-linux-support-policies-069172.pdf for more information.
Oracle recommends that you upgrade the software described by this documentation as soon as possible.
The DTrace helper device (/dev/dtrace/helper)
allows a user-space application that contains DTrace probes to
send probe provider information to DTrace.
To trace user-space processes that are run by users other than
root, you must change the mode of the DTrace
helper device to allow the user to record tracing information,
for example:
# chmod 666 /dev/dtrace/helper
Alternatively, if the acl package is
installed on your system, you can use an ACL rule to limit
access to a specific user, for example:
# setfacl -m u:guest:rw /dev/dtrace/helperYou must change the mode on the device before the user runs the program.
You can create a udev rules file such as
/etc/udev/rules.d/10-dtrace.rules to change
the permissions on the device file when the system starts.
To change the mode of the device file, the udev rules file should contain the following line:
kernel=="dtrace/helper", MODE="0666"
To change the ACL settings for the device file, use a line such as the following in the udev rules file:
kernel=="dtrace/helper", RUN="/usr/bin/setfacl -m u:guest:rw /dev/dtrace/helper"
To apply the udev rule without needing to restart the system, run the start_udev command.