added pldd.sh

bin/pldd.sh

@@ -0,0 +1,78 @@
+#!/usr/bin/env bash
+#  vim:ts=4:sts=4:sw=4:et
+#
+#  Author: Hari Sekhon
+#  Date: 2024-09-16 02:32:28 +0200 (Mon, 16 Sep 2024)
+#
+#  https///github.com/HariSekhon/DevOps-Bash-tools
+#
+#  License: see accompanying Hari Sekhon LICENSE file
+#
+#  If you're using my code you're welcome to connect with me on LinkedIn and optionally send me feedback to help steer this or other code I publish
+#
+#  https://www.linkedin.com/in/HariSekhon
+#
+
+set -euo pipefail
+[ -n "${DEBUG:-}" ] && set -x
+srcdir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+# shellcheck disable=SC1090,SC1091
+. "$srcdir/lib/utils.sh"
+
+# shellcheck disable=SC2034,SC2154
+usage_description="
+On Linux parses the /proc/<pid>/maps to list all dyanmic so libraries that a program is using
+
+The runtime equivalent of the classic Linux ldd command
+
+Because sometimes the in-built pldd command gives results like this:
+
+    pldd: cannot attach to process 1: Operation not permitted
+"
+
+# used by usage() in lib/utils.sh
+# shellcheck disable=SC2034
+usage_args="<pid>"
+
+help_usage "$@"
+
+num_args 1 "$@"
+
+pid="$1"
+
+max_pid="$(cat /proc/sys/kernel/pid_max)"
+
+if ! is_int "$max_pid"; then
+	die "ERROR: failed to determine max pid of the system, got: $max_pid"
+fi
+
+if ! is_int "$pid" ||
+   ! [ "$pid" -ge 1 ] ||
+   ! [ "$pid" -le "$max_pid" ]; then
+	die "Error: PID '$pid' is not in the valid range of 1 to $max_pid"
+fi
+
+maps_file="/proc/$pid/maps"
+
+if [ ! -f "$maps_file" ]; then
+    echo "Could not find /proc/$pid/maps"
+    exit 1
+fi
+
+while IFS= read -r line; do
+    # last field contains the file path
+    lib_path="$(awk '{print $NF}' <<< "$line")"
+
+	# if the path contains in '.so' its a shared library
+    if [[ "$lib_path" =~ \.so$ ]] ||
+       [[ "$lib_path" =~ \.so\. ]]; then
+        realpath=$(readlink -f "$lib_path" 2>/dev/null)
+        if [ -n "$realpath" ]; then
+            echo "$realpath"
+        else
+            echo "$lib_path"
+        fi
+    fi
+done < "$maps_file" |
+sort -u