#! /usr/bin/env stap
# Copyright (C) 2018 Red Hat, Inc.
# Written by William Cohen <wcohen@redhat.com>
#
# also_ran.stp provides a tally of the executables and
# shared libraries used on the system formatted for
# consumption by prometheus.
# The data is read from /proc/systemtap/*/also_ran.stp
#
# Run the script with:
#   stap also_ran.stp
#
# control-c to exit data collection

global arr

# count processes starting up
probe kprocess.exec {
    arr[filename]++
}

# count shared libraries opened via dlopen operations
probe process("/usr/lib*/ld-*.so").function("_dl_map_object_from_fd")?
{
    # get 5th argument (char* realname) from the function
    arr[user_string_quoted(pointer_arg(5))]++
}

probe prometheus {
    @prometheus_dump_array1_map_unquoted(arr, "usage_count", "path", sprint, sprint)
}