3rd-party/linux-kernel-module-cheat
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Improve fops a bit more

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Ciro Santilli
2017-05-12 18:09:32 +01:00
parent 2f77a45f63
commit 8616f6009b
2 changed files with 15 additions and 3 deletions
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7
kernel_module/fops.c
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@@ -30,13 +30,18 @@ int fop_open(struct inode *inode, struct file *file)
ssize_t fop_read(struct file *file, char __user *buf, size_t len, loff_t *off) ssize_t fop_read(struct file *file, char __user *buf, size_t len, loff_t *off)
{ {
printk(KERN_INFO "read\n"); printk(KERN_INFO "read\n");
printk(KERN_INFO "len = %zu\n", len);
/* TODO. */
/*copy_to_user(arg, &msg, size);*/
return 0; return 0;
} }
ssize_t fop_write(struct file *file, const char __user *buf, size_t len, loff_t *off) ssize_t fop_write(struct file *file, const char __user *buf, size_t len, loff_t *off)
{ {
printk(KERN_INFO "write\n"); printk(KERN_INFO "write\n");
return 0; printk(KERN_INFO "buf = %.*s\n", (int)len, buf);
printk(KERN_INFO "len = %zu\n", len);
return len;
} }
/* /*

11
rootfs_overlay/fops.sh
View File

@@ -4,9 +4,16 @@ insmod /fops.ko
mkdir -p /fops mkdir -p /fops
mount -t debugfs none /fops mount -t debugfs none /fops
cd /fops/kernel_module_cheat cd /fops/kernel_module_cheat
cat fops cat fops
# => open # => open
# => read # => read
# => len = [0-9]+
# => close
printf a >fops
# => open
# => write
# => len = a
# => len = 1
# => close # => close
# TODO.
#echo a >fops