[agroal#393]Add Valgrind support

Author: ashu3103

contrib/valgrind/README.md

@@ -0,0 +1,16 @@
+# Valgrind
+
+The [Valgrind](https://valgrind.org/) tool suite provides a number of debugging and profiling tools that help you make your programs faster and more correct. The most popular and the default of these tools is called **Memcheck**. It can detect many memory-related errors that can lead to crashes and unpredictable behaviour.
+
+# Run memory management detection
+
+``` bash
+valgrind --leak-check=full --show-leak-kinds=all --log-file=%p.log --trace-children=yes --track-origins=yes --read-var-info=yes ./pgagroal -c pgagroal.conf -a pgagroal_hba.conf
+```
+
+# Generate valgrind report with suppressed rules
+
+``` bash
+valgrind --suppressions=../../contrib/valgrind/pgagroal.supp --leak-check=full --show-leak-kinds=all --log-file=%p.log --trace-children=yes --track-origins=yes --read-var-info=yes ./pgagroal -c pgagroal.conf -a pgagroal_hba.conf
+```
+

contrib/valgrind/pgagroal.supp

@@ -0,0 +1,170 @@
+#
+# pgagroal rules (Functions that are invoked directly from main)
+#
+
+{
+	pgagroal_bind_host
+	Memcheck:Leak
+	match-leak-kinds: reachable
+	fun:calloc
+	fun:bind_host
+	fun:pgagroal_bind
+	fun:main
+}
+
+{
+	pgagroal_set_proc_title_calloc
+	Memcheck:Leak
+	match-leak-kinds: indirect
+	fun:calloc
+	fun:pgagroal_set_proc_title
+	fun:main
+}
+
+{
+	pgagroal_set_proc_title_malloc
+	Memcheck:Leak
+	match-leak-kinds: definite
+	fun:malloc
+	fun:pgagroal_set_proc_title
+	fun:main
+}
+
+#
+# non-pgagroal rules
+#
+
+{
+   ev_loop_periodics_realloc
+   Memcheck:Leak
+   match-leak-kinds: reachable
+   fun:realloc
+   fun:ev_realloc
+   fun:feed_reverse
+   fun:periodics_reify
+   fun:ev_run.cold
+   fun:ev_loop
+   fun:main
+}
+
+{
+   ev_loop_timers_realloc
+   Memcheck:Leak
+   match-leak-kinds: reachable
+   fun:realloc
+   fun:ev_realloc
+   fun:feed_reverse
+   fun:timers_reify
+   fun:ev_run.cold
+   fun:ev_loop
+   fun:main
+}
+
+{
+   ev_io_realloc
+   Memcheck:Leak
+   match-leak-kinds: reachable
+   fun:realloc
+   fun:ev_realloc
+   fun:fd_change
+   fun:ev_io_start.cold
+   fun:evtimerfd_init
+   fun:ev_periodic_start.cold
+   fun:main
+}
+
+{
+   ev_io_management_realloc
+   Memcheck:Leak
+   match-leak-kinds: reachable
+   fun:realloc
+   fun:ev_realloc
+   fun:ev_io_start.cold
+   fun:start_management
+   fun:main
+}
+
+{
+   ev_io_uds_realloc
+   Memcheck:Leak
+   match-leak-kinds: reachable
+   fun:realloc
+   fun:ev_realloc
+   fun:ev_io_start.cold
+   fun:start_uds
+   fun:main
+}
+
+{
+   ev_io_metrics_realloc
+   Memcheck:Leak
+   match-leak-kinds: reachable
+   fun:realloc
+   fun:ev_realloc
+   fun:ev_io_start.cold
+   fun:start_metrics
+   fun:main
+}
+
+{
+   ev_periodics_realloc
+   Memcheck:Leak
+   match-leak-kinds: reachable
+   fun:realloc
+   fun:ev_realloc
+   fun:ev_feed_event.cold
+   fun:feed_reverse_done
+   fun:periodics_reify
+   fun:ev_run
+   fun:ev_loop
+   fun:main
+}
+
+{
+   ev_periodics_start_realloc
+   Memcheck:Leak
+   match-leak-kinds: reachable
+   fun:realloc
+   fun:ev_realloc
+   fun:ev_periodic_start.cold
+   fun:main
+}
+
+{
+   ev_epoll_realloc
+   Memcheck:Leak
+   match-leak-kinds: reachable
+   fun:realloc
+   fun:ev_realloc
+   fun:epoll_init
+   fun:loop_init
+   fun:ev_default_loop
+   fun:main
+}
+
+{
+   ev_fd_event_realloc
+   Memcheck:Leak
+   match-leak-kinds: reachable
+   fun:realloc
+   fun:ev_realloc
+   fun:ev_feed_event.cold
+   fun:fd_event_nocheck
+   fun:fd_event
+   fun:epoll_poll
+   fun:ev_run
+   fun:ev_loop
+   fun:main
+}
+
+{
+   ev_fd_change_realloc
+   Memcheck:Leak
+   match-leak-kinds: reachable
+   fun:realloc
+   fun:ev_realloc
+   fun:fd_change
+   fun:ev_io_start.cold
+   ...
+   fun:main
+}