new branch muse2, first checkin

1 files changed, 94 insertions, 0 deletions

diff --git a/muse2/muse/givertcap.c b/muse2/muse/givertcap.c
new file mode 100644
index 00000000..2511bc6c
--- /dev/null
+++ b/muse2/muse/givertcap.c
@@ -0,0 +1,94 @@
+/*
+ * COPYRIGHT
+ *
+ * This file is part of Mustajuuri GPL modules. You may distribute it
+ * with or without other Mustajuuri components.
+ *
+ * Author: Tommi Ilmonen, 2001.
+ * Tommi.Ilmonen@hut.fi
+ *
+ * http://www.tml.hut.fi/~tilmonen/mustajuuri/
+
+ * This app also has its own home page at (installation instruction
+ * etc.): http://www.tml.hut.fi/~tilmonen/givertcap/
+
+ * This file is licensed under the GNU Public License (GPL) version
+ * 2. The GPL can also be found from the givertcap home page. Any
+ * application may call civertcap (regardless of the license of the
+ * calling application).
+
+ * If you want a parallel license (for commercial reasons for example),
+ * you should negotiate the matter with the author(s).
+ *
+ */
+
+#include <stdio.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#undef _POSIX_SOURCE
+#include <sys/capability.h>
+/* If the compilation fails on the preceding line, then you probably
+   do not have the libcap installed.
+
+*/
+
+static void usage(const char *programName)
+{
+  fprintf(stderr,
+ 	  "usage: %s \n\n"
+	  "  This program gives real-time application capabilities to the"
+	  "  parent process\n\n"
+	  "[Copyright (c) 2001 Tommi Ilmonen <Tommi.Ilmonen@hut.fi>]\n"
+	  "Home page: http://www.tml.hut.fi/~tilmonen/givertcap/\n",
+	  programName);
+}
+
+int main(int argc, char **argv)
+{
+  if(argc > 1) {
+    usage(argv[0]);
+    return 1;
+  }
+
+  pid_t parentPid = getppid();
+
+  if(!parentPid)
+    return 1;
+
+  cap_t caps = cap_init();
+
+#define nofCaps 3
+
+  /* We need these capabilities:
+
+     CAP_SYS_NICE      -> Real-time priority
+     CAP_SYS_RESOURCE  -> RTC above 64 Hz
+     CAP_IPC_LOCK      -> mlockall
+  */
+
+  cap_value_t capList[nofCaps] =
+  { CAP_SYS_NICE, CAP_SYS_RESOURCE, CAP_IPC_LOCK} ;
+
+  cap_clear(caps);
+  cap_set_flag(caps, CAP_EFFECTIVE,   nofCaps, capList , CAP_SET);
+  cap_set_flag(caps, CAP_INHERITABLE, nofCaps, capList , CAP_SET);
+  cap_set_flag(caps, CAP_PERMITTED,   nofCaps, capList , CAP_SET);
+
+  /* If your COMPILATION FAILS here then you probably are not running
+     Linux. the function "capsetp" is not part of the POSIX capability
+     standard, but a Linux-specific extension. */
+  if (capsetp(parentPid, caps)) {
+    perror("mjsucaps: capsetp");
+    return 1;
+  }
+
+  ssize_t x;
+//  printf("The process %d was give capabilities %s\n",
+//	 (int) parentPid, cap_to_text(caps, &x));
+  fflush(0);
+
+  // Don't bother to free the memory...
+
+  return 0;
+}