libmodprobe: add support to remove modules

Add a remove method which will unload a given module from the kernel,
along with any modules it depended on, assuming those modules are now
unused.

Change-Id: Ie66dc153ef1771f50e26421d38d3656e95954780

1 files changed, 9 insertions, 0 deletions

diff --git a/libmodprobe/libmodprobe_ext.cpp b/libmodprobe/libmodprobe_ext.cpp
index 5f3a04da8..8cbd08c5a 100644
--- a/libmodprobe/libmodprobe_ext.cpp
+++ b/libmodprobe/libmodprobe_ext.cpp
@@ -51,6 +51,15 @@ bool Modprobe::Insmod(const std::string& path_name) {
     return true;
 }
 
+bool Modprobe::Rmmod(const std::string& module_name) {
+    int ret = syscall(__NR_delete_module, MakeCanonical(module_name).c_str(), O_NONBLOCK);
+    if (ret != 0) {
+        PLOG(ERROR) << "Failed to remove module '" << module_name << "'";
+        return false;
+    }
+    return true;
+}
+
 bool Modprobe::ModuleExists(const std::string& module_name) {
     struct stat fileStat;
     auto deps = GetDependencies(module_name);