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            If you want to compile the sum-module (source mirrored below), follow these steps:

            Create the Makefile in your directory with the sum-module.c

             obj-m    := sum-module.o

            KDIR    := /lib/modules/$(shell uname -r)/build

            PWD    := $(shell pwd)

            default:

                   $(MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules

            Now do a

             make

            ... and the sum-module.ko is built.

             If you get something like this

            # make

            make: Nothing to be done for `default'.

            you need to install the kernel source and compile the kernel first (run "make" at least to the point until
             all "HOSTCC scripts/" stuff is done - this will configure your kernel and allows external module compilation).
            Make sure /lib/modules/$(shell uname -r)/build points to your build directory (most likely /usr/src/linux...).

            Another reason for the above error can be, that your browser converted the TAB before $(MAKE) to spaces.

            Make sure there is a TAB before $(MAKE).

            Install it with install.sh:

            #!/bin/sh

            install -m 644 sum-module.ko /lib/modules/`uname -r`/kernel/drivers/sum-module.ko

            /sbin/depmod -a (adjust the /lib/modules path according to your needs)

             Now make a

            # modprobe sum-module

            Or if you don't want to install the module, do this:

            # insmod ./sum-module.ko

            ..and if your system doesn't freeze you've done it right ;-)

             

            For kernel 2.4, the Makefile would look like this:

            TARGET       := modulename

            INCLUDE    := -I/lib/modules/`uname -r`/build/include

            CFLAGS      := -O2 -Wall -DMODULE -D__KERNEL__ -DLINUX

            CC  := gcc ${TARGET}.o: ${TARGET}.c

                   $(CC) $(CFLAGS) ${INCLUDE} -c ${TARGET}.c

             (not yet tested)

            sum-module source from: http://www.win.tue.nl/~aeb/linux/lk/lk-9.html

            /*

             * sum-module.c

            # modprobe sum-module.o

            # ls -l /proc/arith

            total 0

            dr-xr-xr-x    2 root     root            0 Sep 30 12:40 .

            dr-xr-xr-x   89 root     root            0 Sep 30 12:39 ..

            -r--r--r--    1 root     root            0 Sep 30 12:40 sum

            # cat /proc/arith/sum

            0

            # echo 7 > /proc/arith/sum

            # echo 5 > /proc/arith/sum

            # echo 13 > /proc/arith/sum

            # cat /proc/arith/sum

            25

            # rmmod sum-module

            # ls -l /proc/arith

            ls: /proc/arith: No such file or directory

            #

            */

            #include <linux/module.h>

            #include <linux/init.h>

            #include <linux/proc_fs.h>

            #include <asm/uaccess.h>

            static unsigned long long sum;

            static int show_sum(char *buffer, char **start, off_t offset, int length) {

                    int size;

                 size = sprintf(buffer, "%lld\n", sum);

                    *start = buffer + offset;

                    size -= offset;

               return (size > length) ? length : (size > 0) ? size : 0;

            }

            /* Expect decimal number of at most 9 digits followed by '\n' */

            static int add_to_sum(struct file *file, const char *buffer,

                                  unsigned long count, void *data)

            {

                    unsigned long val = 0;

                    char buf[10];

                   char *endp;

                    if (count > sizeof(buf))

                            return -EINVAL;

                    if (copy_from_user(buf, buffer, count))

                            return -EFAULT;

                    val = simple_strtoul(buf, &endp, 10);

                    if (*endp != '\n')

                            return -EINVAL;


                    sum += val;     /* mod 2^64 */

                    return count;

            }

             

            static int __init sum_init(void) {

                    struct proc_dir_entry *proc_arith;

                    struct proc_dir_entry *proc_arith_sum;

                    proc_arith = proc_mkdir("arith", 0);

                    if (!proc_arith) {

                            printk (KERN_ERR "cannot create /proc/arith\n");

                            return -ENOMEM;

                    }

                    proc_arith_sum = create_proc_info_entry("arith/sum", 0, 0, show_sum);

                    if (!proc_arith_sum) {

                            printk (KERN_ERR "cannot create /proc/arith/sum\n");

                            remove_proc_entry("arith", 0);

                            return -ENOMEM;

                    }

                    proc_arith_sum->write_proc = add_to_sum;

                    return 0;

            }

             

            static void __exit sum_exit(void) {

                    remove_proc_entry("arith/sum", 0);

                    remove_proc_entry("arith", 0);

            }

            module_init(sum_init);

            module_exit(sum_exit);

            MODULE_LICENSE("GPL");

             

             from:

            http://www.captain.at/programming/kernel-2.6/

            http://blog.ednchina.com/fafen/267973/message.aspx
            posted on 2010-04-14 23:00 chatler 閱讀(479) 評論(0)  編輯 收藏 引用 所屬分類: linux kernel
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