added a simple rmmod

4 files changed, 53 insertions, 4 deletions

diff --git a/Makefile b/Makefile
index 83f8a68..8d6fe49 100644
--- a/Makefile
+++ b/Makefile
@@ -17,7 +17,8 @@ BIN =\
 	more\
 	hexdump\
 	ifconfig\
-	ping
+	ping\
+	rmmod
 
 LIBUTILOBJ = $(LIBUTILSRC:.c=.o)
 OBJ = $(BIN:=.o) $(LIBUTFOBJ) $(LIBUTILOBJ)
diff --git a/README b/README
index 5745cd1..e53ed1c 100644
--- a/README
+++ b/README
@@ -11,11 +11,10 @@ Currently it contains the following:
 - a 'ifconfig': show and configure simple interfaces
 - a 'ping': test a network connection
 - a 'netstat': see list of active connections of a machine
-- a 'mkswap': swapon/swapoff exist, so we should also be able to create
-  a swap
+- a 'mkswap': swapon/swapoff/swaplabel exist, so we should also be able
+  to create a swap
 - 'fsck.ext4', 'mkfs.ext4': if ext4 is the only file system we support
 - 'nbd-client': for NBD root mounts
-- 'rmmod': 'insmod/lsmod' exists in ubase, removing is important to
   play with hardware. dependencies can also be done from the text
   modules.dep file and a samurai or simplistic make, 'modprobe' as
   shell wrapper on dependencies and insmod calls
diff --git a/rmmod.1 b/rmmod.1
new file mode 100644
index 0000000..3c526da
--- /dev/null
+++ b/rmmod.1
@@ -0,0 +1,15 @@
+.Dd 2023-05-07
+.Dt RMMID 1
+.Os abase
+.Sh NAME
+.Nm rmmid
+.Nd remove module for the Linux kernl
+.Sh SYNOPSIS
+.Nm
+{module}
+.Sh DESCRIPTION
+.Nm
+Removes a loaded Linux kernel module named
+.Ar module
+.RE
+
diff --git a/rmmod.c b/rmmod.c
new file mode 100644
index 0000000..e0545d3
--- /dev/null
+++ b/rmmod.c
@@ -0,0 +1,34 @@
+/* See LICENSE file for copyright and license details. */
+#include <fcntl.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+
+#include "util.h"
+
+static void
+usage(void)
+{
+	eprintf("usage: %s <module>\n", argv0);
+}
+
+int
+main(int argc, char *argv[])
+{
+	char *module;
+
+	ARGBEGIN {
+	default:
+		usage();
+	} ARGEND
+
+	if (argc != 1) {
+		weprintf("Expecting exactly one 'module' to remove\n");
+		usage();
+	}
+	module = argv[0];
+	
+	if (syscall(__NR_delete_module, module, O_NONBLOCK) < 0)
+		eprintf("delete_module:");
+
+	return 0;
+}