battery plugin: Don't complain about missing /proc/acpi/battery each interval.

Instead, complain once when the read callback is called for the first time.

diff --git a/src/battery.c b/src/battery.c
index 416f339..3e72699 100644 (file)
--- a/src/battery.c
+++ b/src/battery.c
@@ -23,6 +23,8 @@
 #include "common.h"
 #include "plugin.h"
 
+#include "utils_complain.h"
+
 #if HAVE_MACH_MACH_TYPES_H
 #  include <mach/mach_types.h>
 #endif
@@ -437,6 +439,8 @@ static int battery_read (void)
 /* #endif HAVE_IOKIT_IOKITLIB_H || HAVE_IOKIT_PS_IOPOWERSOURCES_H */
 
 #elif KERNEL_LINUX
+       static c_complain_t acpi_dir_complaint = C_COMPLAIN_INIT_STATIC;
+
        FILE *fh;
        char buffer[1024];
        char filename[256];
@@ -507,8 +511,17 @@ static int battery_read (void)
                        battery_submit ("0", "voltage", voltage);
        }
 
-       walk_directory (battery_acpi_dir, battery_read_acpi,
-                       /* user_data = */ NULL);
+       if (0 == access (battery_acpi_dir, R_OK))
+               walk_directory (battery_acpi_dir, battery_read_acpi,
+                               /* user_data = */ NULL);
+       else
+       {
+               char errbuf[1024];
+               c_complain_once (LOG_WARNING, &acpi_dir_complaint,
+                               "battery plugin: Failed to access `%s': %s",
+                               battery_acpi_dir,
+                               sstrerror (errno, errbuf, sizeof (errbuf)));
+       }
 
 #endif /* KERNEL_LINUX */