OpenSolaris Launch

1 files changed, 159 insertions, 0 deletions

diff --git a/usr/src/cmd/mdb/demo/common/example2.c b/usr/src/cmd/mdb/demo/common/example2.c
new file mode 100644
index 0000000000..6c7ae07a41
--- /dev/null
+++ b/usr/src/cmd/mdb/demo/common/example2.c
@@ -0,0 +1,159 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (the "License").  You may not use this file except in compliance
+ * with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright (c) 1998-1999 by Sun Microsystems, Inc.
+ * All rights reserved.
+ */
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+#include <sys/mdb_modapi.h>
+#include <sys/proc.h>
+
+/*
+ * Initialize the proc_t walker by either using the given starting address,
+ * or reading the value of the kernel's practive pointer.  We also allocate
+ * a proc_t for storage, and save this using the walk_data pointer.
+ */
+static int
+sp_walk_init(mdb_walk_state_t *wsp)
+{
+	if (wsp->walk_addr == NULL &&
+	    mdb_readvar(&wsp->walk_addr, "practive") == -1) {
+		mdb_warn("failed to read 'practive'");
+		return (WALK_ERR);
+	}
+
+	wsp->walk_data = mdb_alloc(sizeof (proc_t), UM_SLEEP);
+	return (WALK_NEXT);
+}
+
+/*
+ * At each step, read a proc_t into our private storage, and then invoke
+ * the callback function.  We terminate when we reach a NULL p_next pointer.
+ */
+static int
+sp_walk_step(mdb_walk_state_t *wsp)
+{
+	int status;
+
+	if (wsp->walk_addr == NULL)
+		return (WALK_DONE);
+
+	if (mdb_vread(wsp->walk_data, sizeof (proc_t), wsp->walk_addr) == -1) {
+		mdb_warn("failed to read proc at %p", wsp->walk_addr);
+		return (WALK_DONE);
+	}
+
+	status = wsp->walk_callback(wsp->walk_addr, wsp->walk_data,
+	    wsp->walk_cbdata);
+
+	wsp->walk_addr = (uintptr_t)(((proc_t *)wsp->walk_data)->p_next);
+	return (status);
+}
+
+/*
+ * The walker's fini function is invoked at the end of each walk.  Since we
+ * dynamically allocated a proc_t in sp_walk_init, we must free it now.
+ */
+static void
+sp_walk_fini(mdb_walk_state_t *wsp)
+{
+	mdb_free(wsp->walk_data, sizeof (proc_t));
+}
+
+static int
+simple_ps(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
+{
+	struct pid pid;
+	proc_t p;
+
+	if (argc != 0)
+		return (DCMD_USAGE);
+
+	/*
+	 * If no proc_t address was specified on the command line, we can
+	 * print out all processes by invoking the walker, using this
+	 * dcmd itself as the callback.
+	 */
+	if (!(flags & DCMD_ADDRSPEC)) {
+		if (mdb_walk_dcmd("simple_proc", "simple_ps",
+		    argc, argv) == -1) {
+			mdb_warn("failed to walk 'simple_proc'");
+			return (DCMD_ERR);
+		}
+		return (DCMD_OK);
+	}
+
+	/*
+	 * If this is the first invocation of the command, print a nice
+	 * header line for the output that will follow.
+	 */
+	if (DCMD_HDRSPEC(flags))
+		mdb_printf("%5s %s\n", "PID", "COMM");
+
+	/*
+	 * For each process, we just need to read the proc_t struct, read
+	 * the pid struct addressed by p_pidp, and then print out the pid
+	 * and the command name.
+	 */
+	if (mdb_vread(&p, sizeof (p), addr) == sizeof (p)) {
+
+		if (mdb_vread(&pid, sizeof (pid),
+		    (uintptr_t)p.p_pidp) == sizeof (pid))
+			mdb_printf("%5d %s\n", pid.pid_id, p.p_user.u_comm);
+		else
+			mdb_warn("failed to read struct pid at %p", p.p_pidp);
+	} else
+		mdb_warn("failed to read process at %p", addr);
+
+	return (DCMD_OK);
+}
+
+/*
+ * MDB module linkage information:
+ *
+ * We declare a list of structures describing our dcmds, a list of structures
+ * describing our walkers, and a function named _mdb_init to return a pointer
+ * to our module information.
+ */
+
+static const mdb_dcmd_t dcmds[] = {
+	{ "simple_ps", NULL, "simple process list", simple_ps },
+	{ NULL }
+};
+
+static const mdb_walker_t walkers[] = {
+	{ "simple_proc", "walk list of proc_t structures",
+		sp_walk_init, sp_walk_step, sp_walk_fini },
+	{ NULL }
+};
+
+static const mdb_modinfo_t modinfo = {
+	MDB_API_VERSION, dcmds, walkers
+};
+
+const mdb_modinfo_t *
+_mdb_init(void)
+{
+	return (&modinfo);
+}