Add a PROFILE mode

* Makefile: Change FOOFLAGS defaults to appropriate values when
  $(PROFILE) is defined.
* rootdir.c: Add an "exit" file, which causes exit to be called
  when looked up, so that profiling data can be written to disk.

2 files changed, 18 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index b8c055f..a397522 100644
--- a/Makefile
+++ b/Makefile
@@ -6,13 +6,21 @@ LIBS = -lnetfs -lps
 CC = gcc
 CFLAGS = -Wall -g
 CPPFLAGS =
+LDFLAGS =
+
+ifdef PROFILE
+CFLAGS= -g -pg
+CPPFLAGS= -DPROFILE
+LDFLAGS= -static
+LIBS= -lnetfs -lfshelp -liohelp -lps -lports -lthreads -lihash -lshouldbeinlibc
+endif
 
 CPPFLAGS += -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64
 
 all: $(TARGET)
 
 $(TARGET): $(OBJS)
-	$(CC) $(CFLAGS) -o $@ $^ $(LIBS)
+	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ $(LIBS)
 
 clean:
 	$(RM) $(TARGET) $(OBJS)
diff --git a/rootdir.c b/rootdir.c
index c6ddd87..204bc02 100644
--- a/rootdir.c
+++ b/rootdir.c
@@ -422,6 +422,15 @@ static const struct procfs_dir_entry rootdir_entries[] = {
       .cleanup_contents = procfs_cleanup_contents_with_free,
     },
   },
+#ifdef PROFILE
+  /* In order to get a usable gmon.out file, we must apparently use exit(). */
+  {
+    .name = "exit",
+    .ops = {
+      .make_node = exit,
+    },
+  },
+#endif
   {}
 };