callgraph

commit 0387a0f15d12374ad70a18db01594a835345fd47
parent cfa67f131264dad5f192ef5092660eb9dd078286
Author: lostd <lostd@2f30.org>
Date:   Thu, 14 Nov 2013 22:58:35 +0200

Use callgraph.dot by default, CGRAPH_OUT otherwise

Diffstat:
M
README
 | 
7
++++++-
M
libcallgraph.c
 | 
7
++++++-
M
symbolize.sh
 | 
3
++-

3 files changed, 14 insertions(+), 3 deletions(-)
diff --git a/README b/README
@@ -18,8 +18,13 @@ to be in the library path.
 
 	LD_LIBRARY_PATH=$PWD ./prog [ARGS]
 
+This generates a callgraph.dot file by default.  If you want another
+output filename just set the CGRAPH_OUT environment variable.
+
+	CGRAPH_OUT=prog.dot
+
 Once the program terminates, you may want to replace addresses in the
-generated callgraph.dot file with function names, using the symbolizer.
+generated .dot file with function names, using the symbolizer.
 
 	./symbolize.sh ./prog
 
diff --git a/libcallgraph.c b/libcallgraph.c
@@ -65,7 +65,12 @@ writelog(int fildes, const void *buf, size_t nbyte)
 __attribute__ ((constructor)) static void
 init_logging(void)
 {
-     fd = open("callgraph.dot", O_WRONLY | O_CREAT | O_EXCL, 0644);
+     char *f;
+
+     f = getenv("CGRAPH_OUT");
+     if (f == NULL)
+          f = "callgraph.dot";
+     fd = open(f, O_WRONLY | O_CREAT | O_EXCL, 0644);
      if (fd == -1) {
           perror("cgraph");
           _Exit(EXIT_FAILURE);
diff --git a/symbolize.sh b/symbolize.sh
@@ -7,7 +7,8 @@ if [ ! -n "$1" ]; then
 	exit 1
 fi
 
-CGRAPH_OUT=callgraph.dot
+CGRAPH_OUT=$(test -n "$CGRAPH_OUT" && echo $CGRAPH_OUT || \
+    echo callgraph.dot)
 
 if [ ! -f "$CGRAPH_OUT" ]; then
 	echo "$CGRAPH_OUT does not exist!" 1>&2