fdcfun: search C function definition in Linux source

zshrc

@@ -3806,6 +3806,15 @@ if command -v direnv &> /dev/null ; then
     eval "$(direnv hook zsh)"
 fi
 
+# Command to search C function definitions, with Linux kernel coding style.
+# Example:
+#   $ fdcfun wait_for_completion
+if command -v rg &> /dev/null; then
+    fdcfun() {
+        rg -U "$1(.*)\n\{"
+    }
+fi
+
 # add local binaries
 if [[ -r ~/bin ]]; then
     PATH=$PATH:~/bin