From 00d5bce9f24e2114316bd1165ebdad05644b7365 Mon Sep 17 00:00:00 2001
From: Guillermo Ramos
Date: Wed, 20 Jul 2011 21:46:28 +0200
Subject: Añadido pid2 y ejemplos de oreilly

---
 .gitignore      |   1 +
 examples.tar.gz | Bin 0 -> 71527 bytes
 pid2/Makefile   |   7 +++++++
 pid2/loader.sh  |  23 +++++++++++++++++++++++
 pid2/pid.c      |  50 ++++++++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 81 insertions(+)
 create mode 100644 examples.tar.gz
 create mode 100644 pid2/Makefile
 create mode 100644 pid2/loader.sh
 create mode 100644 pid2/pid.c

diff --git a/.gitignore b/.gitignore
index ec70db6..71007a0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,4 @@
 Module.symvers
 modules.order
 .tmp_versions
+examples
diff --git a/examples.tar.gz b/examples.tar.gz
new file mode 100644
index 0000000..6b51100
Binary files /dev/null and b/examples.tar.gz differ
diff --git a/pid2/Makefile b/pid2/Makefile
new file mode 100644
index 0000000..b9e7cfd
--- /dev/null
+++ b/pid2/Makefile
@@ -0,0 +1,7 @@
+obj-m += pid.o
+
+all:
+	make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
+
+clean:
+	make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean
diff --git a/pid2/loader.sh b/pid2/loader.sh
new file mode 100644
index 0000000..579acff
--- /dev/null
+++ b/pid2/loader.sh
@@ -0,0 +1,23 @@
+#!/bin/bash
+module="pidevice"
+device="pidevice"
+mode="644"
+
+insmod ./$module.ko $* || exit -1
+
+rm -f /dev/${device}[0-4]
+
+major=$(cat /proc/devices | grep $module | cut -f 1)
+
+echo major
+exit -1
+
+for i in {0..3}; do
+	mknod /dev/${device}$i c $major $i
+done
+
+group="staff"
+grep -q '^staff:' /etc/group || group="wheel"
+
+chgrp $group /dev/${device}[0-3]
+chmod $mode /dev/${device}[0-3]
diff --git a/pid2/pid.c b/pid2/pid.c
new file mode 100644
index 0000000..6362f82
--- /dev/null
+++ b/pid2/pid.c
@@ -0,0 +1,50 @@
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/kdev_t.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/types.h>
+
+static char devname[] = "pidevice";
+static char modname[] = "pid.ko";
+static dev_t mydev;
+static struct task_struct *mytask;
+static struct task_struct *parent;
+
+static void show_processes(void)
+{
+	mytask = current;
+	parent = mytask->parent;
+
+	while (mytask->pid != parent->pid) {
+		printk(KERN_ALERT "current: %s (%d) - parent: %s (%d)\n",
+				mytask->comm, mytask->pid, parent->comm, parent->pid);
+		mytask = mytask->parent;
+		parent = mytask->parent;
+	}
+}
+
+static int __init init(void)
+{
+	int err;
+
+	printk(KERN_ALERT "%s loaded by %s (%d)\n",
+			modname, mytask->comm, mytask->pid);
+
+	if ((err = alloc_chrdev_region(&mydev, 0, 1, devname)))
+		printk(KERN_ALERT "ERROR in alloc_chrdev_region: %d\n", err);
+
+	return 0;
+}
+
+static void __exit exit(void)
+{
+	unregister_chrdev_region(mydev, 1);
+	printk(KERN_ALERT "%s unloaded\n", modname);
+}
+
+module_init(init);
+module_exit(exit);
+
+MODULE_LICENSE("GPL");
-- 
cgit v1.2.3