Workshop plugin

plugin/proc_info/CMakeLists.txt

+MYSQL_ADD_PLUGIN(PROC_INFO proc_info.cc RECOMPILE_FOR_EMBEDDED)

plugin/proc_info/mysql-test/proc_info/basic.test

+SHOW CREATE TABLE INFORMATION_SCHEMA.PROC_MEMINFO;
+query_vertical SELECT PLUGIN_NAME, PLUGIN_VERSION, PLUGIN_TYPE, PLUGIN_AUTHOR, PLUGIN_DESCRIPTION, PLUGIN_LICENSE, PLUGIN_MATURITY FROM INFORMATION_SCHEMA.PLUGINS WHERE PLUGIN_NAME='proc_meminfo';
+SELECT * FROM INFORMATION_SCHEMA.PROC_MEMINFO;

plugin/proc_info/mysql-test/proc_info/suite.opt

+--plugin-load-add=$PROC_INFO_SO  --plugin-proc-meminfo=ON

plugin/proc_info/mysql-test/proc_info/suite.pm

+package My::Suite::Proc_info;
+
+@ISA = qw(My::Suite);
+
+return "No PROC_INFO plugin" unless
+  $ENV{PROC_INFO_SO} or
+  $::mysqld_variables{'proc-info'} eq "ON";
+
+return "Not run for embedded server" if $::opt_embedded_server;
+
+sub is_default { 1 }
+
+bless { };

plugin/proc_info/proc_info.cc

+#include <my_global.h>
+#include <table.h>
+#include <sql_show.h>
+#include <sql_class.h>
+#include <mysql/plugin.h>
+
+
+static ST_FIELD_INFO fields[]=
+{
+  { "NAME", 100, MYSQL_TYPE_STRING, 0, 0, 0, SKIP_OPEN_TABLE },
+  { "VALUE", 21, MYSQL_TYPE_LONG, 0, MY_I_S_UNSIGNED, 0, SKIP_OPEN_TABLE },
+  { 0, 0, MYSQL_TYPE_STRING, 0, 0, 0, 0 }
+};
+
+
+static int fill(MYSQL_THD thd, TABLE_LIST *tables, COND *cond)
+{
+  TABLE *table= tables->table;
+  char name[1024];
+  unsigned long value;
+  FILE *fp;
+  int res;
+
+  if (!(fp= fopen("/proc/meminfo", "r")))
+    return 1;
+
+  while ((res= fscanf(fp, "%[^:]: %lu kB\n", name, &value)) != EOF)
+  {
+    if (res != 2)
+      continue;
+    table->field[0]->store(name, strlen(name), system_charset_info);
+    table->field[1]->store(value);
+    if (schema_table_store_record(thd, table))
+    {
+      fclose(fp);
+      return 1;
+    }
+  }
+  fclose(fp);
+
+  return 0;
+}
+
+
+static int init(void *p)
+{
+  ST_SCHEMA_TABLE *schema= (ST_SCHEMA_TABLE *) p;
+
+  schema->fields_info= fields;
+  schema->fill_table= fill;
+
+  return 0;
+}
+
+
+static struct st_mysql_information_schema plugin=
+{ MYSQL_INFORMATION_SCHEMA_INTERFACE_VERSION };
+
+
+maria_declare_plugin(proc_info)
+{
+  MYSQL_INFORMATION_SCHEMA_PLUGIN, /* type                */
+  &plugin,                         /* information schema  */
+  "PROC_MEMINFO",                  /* name                */
+  ""      ,                        /* author              */
+  "Useful information from /proc", /* description         */
+  PLUGIN_LICENSE_BSD,              /* license             */
+  init,                            /* init callback       */
+  0,                               /* deinit callback     */
+  0x0100,                          /* version as hex      */
+  NULL,                            /* status variables    */
+  NULL,                            /* system variables    */
+  "1.0",                           /* version as a string */
+  MariaDB_PLUGIN_MATURITY_EXPERIMENTAL
+}
+maria_declare_plugin_end;