don't create status fifo until we are about to send command.

this allows us to print an error in the case where the jvm exits prematurely

Makefile

@@ -13,7 +13,7 @@ classes/%.class: src/%.java
 	${javac} ${java_src} -d classes/
 
 bin/%: src/%.c
-	gcc $< -o $@
+	gcc -std=c99 $< -o $@
 
 ${jar}: ${classes}
 	jar cf ${jar} -C src/ org

bin/drip

@@ -167,7 +167,6 @@ function launch_jvm {
 
     if mkdir "$jvm_dir"; then
         mkfifo "$jvm_dir/control"
-        mkfifo "$jvm_dir/status"
 
         DRIP_INIT_CLASS=${DRIP_INIT_CLASS:-$main_class}
         export DRIP_INIT_CLASS=${DRIP_INIT_CLASS//\//.}
@@ -283,6 +282,7 @@ function send_env {
 }
 
 function send_args {
+    mkfifo "$active_jvm_dir/status"
     exec 4> "$active_jvm_dir/control"
     send_array "${main_args[@]}" >&4
     send_array "${runtime_args[@]}" >&4

src/drip_daemon.c

@@ -3,6 +3,8 @@
 #include <limits.h>
 #include <stdlib.h>
 #include <stdio.h>
+#include <unistd.h>
+#include <sys/stat.h>
 
 static char* jvm_dir;
 
@@ -44,6 +46,16 @@ int main(int argc, char **argv) {
 
     int status;
     wait(&status);
-    spit_int("status", status/256);
+
+    status /= 256;
+    if (access("status", F_OK) != -1) {
+      spit_int("status", status);
+    } else {
+      fprintf(stderr, "java process exited prematurely with status %d: ", status);
+      for (int i=1; i < argc; i++) {
+        fprintf(stderr, "%s ", argv[i]);
+      }
+      fprintf(stderr, "\n");
+    }
   }
 }

src/drip_proxy.c

@@ -5,10 +5,12 @@
 #include <setjmp.h>
 #include <signal.h>
 #include <stdio.h>
+#include <string.h>
 #include <stdlib.h>
 #include <sys/ioctl.h>
 #include <sys/select.h>
 #include <sys/types.h>
+#include <sys/stat.h>
 #include <termios.h>
 #include <unistd.h>