1 files changed, 73 insertions, 0 deletions
diff --git a/config/os/gnu-linux/sanitycheck.c b/config/os/gnu-linux/sanitycheck.c
new file mode 100644
index 0000000..523fbbc
--- /dev/null
+++ b/config/os/gnu-linux/sanitycheck.c
@@ -0,0 +1,73 @@
+/**
+ * GPL etc.
+ *
+ * @author Florian Faber
+ *
+ * @version 0.1 (2009-01-17) [FF]
+ *              - initial version
+ **/
+
+#include <stdio.h>
+#include <jack/systemtest.h>
+#include <jack/sanitycheck.h>
+
+int sanitycheck() {
+  int errors = 0;
+  int relogin = 0;
+
+  if (!system_user_can_rtprio()) {
+	  errors++;
+	  relogin++;
+	  fprintf(stderr, "\nYou are not allowed to set realtime priority.\n");
+		  
+	  if (!system_has_rtprio_limits_conf()) {
+		  errors++;
+		  relogin++;
+		  fprintf (stderr, "Please check your /etc/security/limits.conf for the following lines\n");
+		  fprintf (stderr, "and correct/add them:\n\n");
+		  fprintf(stderr, "  @audio          -       rtprio          100\n");
+		  fprintf(stderr, "  @audio          -       nice            -10\n");
+	  } else if (!system_has_audiogroup()) {
+		  errors++;
+		  relogin++;
+		  fprintf(stderr, "\nYour system has no audio group. Please add it by executing (as root):\n");
+		  fprintf(stderr, "  groupadd -r audio\n");
+		  fprintf(stderr, "  usermod -a -G audio %s\n", system_get_username());
+	  } else if (!system_user_in_audiogroup()) {
+		  errors++;
+		  relogin++;
+		  fprintf(stderr, "\nYour system has an audio group, but you are not a member of it.\n");
+		  fprintf(stderr, "Please add yourself to the audio group by executing (as root):\n");
+		  fprintf(stderr, "  usermod -a -G audio %s\n", system_get_username());
+	  }
+  }
+  if (system_has_frequencyscaling() && system_uses_frequencyscaling()) {
+	  errors++;
+	  fprintf(stderr, "\nYour system seems to use frequency scaling. This can have a serious impact\n");
+	  fprintf(stderr, "on the audio latency. Please turn it off, e.g. by chosing the 'performance'\n");
+	  fprintf(stderr, "governor.\n");
+  }
+  if (system_memlock_is_unlimited()) {
+	  fprintf(stderr, "\nMemory locking is unlimited - this is dangerous. Please alter the line");
+	  fprintf(stderr, "  @audio   -  memlock    unlimited");
+	  fprintf(stderr, "in your /etc/limits.conf to");
+	  fprintf(stderr, "  @audio   -  memlock    %llu\n", (system_available_physical_mem()*3)/4096);
+  } else if (0==system_memlock_amount()) {
+	  errors++;
+	  relogin++;
+	  fprintf(stderr, "\nYou are not allowed to lock memory. Please add a line\n");
+	  fprintf(stderr, "  @audio   -  memlock    %llu\n", (system_available_physical_mem()*3)/4096);
+	  fprintf(stderr, "in your /etc/limits.conf.\n");
+  }
+  
+  if (0<relogin) {
+	  fprintf(stderr, "\nAfter applying these changes, please re-login in order for them to take effect.\n");
+  }
+  
+  if (0<errors) {
+	  fprintf(stderr, "\nYou don't appear to have a sane system configuration. It is very likely that you\n");
+	  fprintf(stderr, "encounter xruns. Please apply all the above mentioned changes and start jack again!\n");
+  }
+  
+  return errors;
+}