removed need to 'sudo setcap' on DT executable

pack/df_linux/distro_fixes.sh

@@ -170,6 +170,9 @@ if [ -n "$ZLIB_PATH" ]; then
     dlog INFO "Attempting to use zlib at $ZLIB_PATH"
 fi
 
+# Include set_ptracer_any.so in PRELOAD_LIB to remove the necessity to run setcap on the Dwarf Therapist executable
+export PRELOAD_LIB="${PRELOAD_LIB:+$PRELOAD_LIB:}./libs/set_ptracer_any.so"
+
 dlog "INFO" "PRELOAD_LIB: $PRELOAD_LIB"
 dlog "INFO" "LD_LIBRARY_PATH: $LD_LIBRARY_PATH"
 dlog "INFO" "Done"

pack/df_linux/libs/set_ptracer_any.c

@@ -0,0 +1,12 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/prctl.h>
+
+void set_ptracer_any() __attribute__((constructor));
+
+void set_ptracer_any()
+{
+	if (-1 == prctl(PR_SET_PTRACER, PR_SET_PTRACER_ANY, 0, 0, 0))
+		perror("prctl");
+}

pack/startlnp

@@ -26,20 +26,5 @@ if [ ! -d df_linux ]; then
     echo "working directory: $(pwd)"
 fi
 
-gcap="$(whereis -b getcap | cut -f2 -d":" | tr -d " ")"
-scap="$(whereis -b setcap | cut -f2 -d":" | tr -d " ")"
-
-if [ -x $gcap ] && [ -x $scap ]; then
-    #Check whether Dwarf Therapist can read from DF memory:
-    dt_capabilities=$($gcap LNP/utilities/dwarf_therapist/dwarftherapist |cut -f2 -d"="|tr -d " ")
-    dt_capabilities=${dt_capabilities:=0}
-    if [ ${dt_capabilities} != "cap_sys_ptrace+eip" ]; then
-        msg="Enable Dwarf Therapist to read from Dwarf Fortress memory"
-        xterm -e "echo $msg;sudo $scap cap_sys_ptrace=eip LNP/utilities/dwarf_therapist/dwarftherapist"
-    fi
-else
-    warn "Could not find getcap and/or setcap"
-fi
-
 #run Lazy Newb Pack
 ./PyLNP "$@" || warn "Failed to start PyLNP"