函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:fs\ioctl.c Create Date:2022-07-29 10:36:15
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：vfs_ioctl - call filesystem specific ioctl methods*@filp: open file to invoke ioctl method on*@cmd: ioctl command to execute*@arg: command-specific argument for ioctl* Invokes filesystem specific ->unlocked_ioctl, if one exists; otherwise* returns -ENOTTY.

函数原型：long vfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)

返回类型：long

参数：

类型参数名称
struct file *filp
unsigned intcmd
unsigned longarg
42  error等于负ENOTTY
44  如果非unlocked_ioctl则转到:out
47  error等于unlocked_ioctl(filp, cmd, arg)
48  如果error恒等于负No ioctl command 则error等于负ENOTTY
50  out :
51  返回:error
调用者
名称描述
file_ioctl
do_vfs_ioctlWhen you add any new common ioctls to the switches above and below* please update compat_sys_ioctl() too.* do_vfs_ioctl() is not for drivers and not intended to be EXPORT_SYMBOL()'d.* It's just a simple helper for sys_ioctl and compat_sys_ioctl.