Add thpoff.c file

thpoff.c

+// PUBLIC DOMAIN CODE
+//
+// A tiny program that disable transparent huge pages on arbitrary processes
+// thpoff echo 1 : will run echo 1 with SET_THP_DISABLE true on the process
+#include <stdio.h>
+#include <sys/prctl.h>
+#include <unistd.h>
+#include <errno.h>
+
+int main( int argc, char **argv) {
+    if (argc < 2) {
+	fprintf(stderr, "ERROR: expecting at least 1 argument!\n");
+	return -1;
+    }
+    prctl(PR_SET_THP_DISABLE, 1, 0, 0, 0);
+
+    char* newargv[argc];
+    int i;
+
+    newargv[argc-1] = NULL;
+    for (i=1; i<argc; i++) {
+	newargv[i-1] = argv[i];
+    }
+
+    execvp(argv[1], newargv);
+
+    if (errno == ENOENT) {
+	fprintf(stderr, "ERROR: file not found\n");
+	return -1;
+    } else if (errno == EACCES) {
+	fprintf(stderr, "ERROR: can not run file\n");
+	return -1;
+    } else if (errno > 0) {
+	fprintf(stderr, "ERROR: %i errno while attempting to run file\n", errno);
+	return -1;
+    }
+
+    return 0;
+}
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