Implemented step-back for the cpu-plugin, mach part when trying to read temperature..

diff --git a/src/cpu.c b/src/cpu.c
index 96a8c15..ca78294 100644 (file)
--- a/src/cpu.c
+++ b/src/cpu.c
@@ -82,6 +82,12 @@
 static mach_port_t port_host;
 static processor_port_array_t cpu_list;
 static mach_msg_type_number_t cpu_list_len;
+
+#if PROCESSOR_TEMPERATURE
+static int cpu_temp_retry_counter = 0;
+static int cpu_temp_retry_step    = 1;
+static int cpu_temp_retry_max     = 1;
+#endif /* PROCESSOR_TEMPERATURE */
 /* #endif PROCESSOR_CPU_LOAD_INFO */
 
 #elif defined(KERNEL_LINUX)
@@ -117,6 +123,7 @@ static void cpu_init (void)
 {
 #if PROCESSOR_CPU_LOAD_INFO || PROCESSOR_TEMPERATURE
        kern_return_t status;
+       int collectd_step;
 
        port_host = mach_host_self ();
 
@@ -130,6 +137,11 @@ static void cpu_init (void)
 
        DBG ("host_processors returned %i %s", (int) cpu_list_len, cpu_list_len == 1 ? "processor" : "processors");
        syslog (LOG_INFO, "cpu-plugin: Found %i processor%s.", (int) cpu_list_len, cpu_list_len == 1 ? "" : "s");
+
+       collectd_step = atoi (COLLECTD_STEP);
+       if ((collectd_step > 0) && (collectd_step <= 86400))
+               cpu_temp_retry_max = 86400 / collectd_step;
+               
 /* #endif PROCESSOR_CPU_LOAD_INFO */
 
 #elif defined(HAVE_LIBKSTAT)
@@ -226,13 +238,13 @@ static void cpu_read (void)
                                                PROCESSOR_CPU_LOAD_INFO, &cpu_host,
                                                (processor_info_t) &cpu_info, &cpu_info_len)) != KERN_SUCCESS)
                {
-                       syslog (LOG_ERR, "processor_info failed with status %i\n", (int) status);
+                       syslog (LOG_ERR, "cpu-plugin: processor_info failed with status %i\n", (int) status);
                        continue;
                }
 
                if (cpu_info_len < CPU_STATE_MAX)
                {
-                       syslog (LOG_ERR, "processor_info returned only %i elements..\n", cpu_info_len);
+                       syslog (LOG_ERR, "cpu-plugin: processor_info returned only %i elements..\n", cpu_info_len);
                        continue;
                }
 
@@ -243,6 +255,18 @@ static void cpu_read (void)
                                0ULL);
 #endif /* PROCESSOR_CPU_LOAD_INFO */
 #if PROCESSOR_TEMPERATURE
+               /*
+                * Not all Apple computers do have this ability. To minimize
+                * the messages sent to the syslog we do an exponential
+                * stepback if `processor_info' fails. We still try ~once a day
+                * though..
+                */
+               if (cpu_temp_retry_counter > 0)
+               {
+                       cpu_temp_retry_counter--;
+                       continue;
+               }
+
                cpu_temp_len = PROCESSOR_INFO_MAX;
 
                status = processor_info (cpu_list[cpu],
@@ -251,8 +275,14 @@ static void cpu_read (void)
                                cpu_temp, &cpu_temp_len);
                if (status != KERN_SUCCESS)
                {
-                       syslog (LOG_ERR, "processor_info failed: %s",
+                       syslog (LOG_ERR, "cpu-plugin: processor_info failed: %s",
                                        mach_error_string (status));
+
+                       cpu_temp_retry_counter = cpu_temp_retry_step;
+                       cpu_temp_retry_step *= 2;
+                       if (cpu_temp_retry_step > cpu_temp_retry_max)
+                               cpu_temp_retry_step = cpu_temp_retry_max;
+
                        continue;
                }
 
@@ -263,6 +293,9 @@ static void cpu_read (void)
                        continue;
                }
 
+               cpu_temp_retry_counter = 0;
+               cpu_temp_retry_step    = 1;
+
                DBG ("cpu_temp = %i", (int) cpu_temp);
 #endif /* PROCESSOR_TEMPERATURE */
        }