函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:block\compat_ioctl.c Create Date:2022-07-27 19:36:40
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：compat_cdrom_read_audio

函数原型：static int compat_cdrom_read_audio(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg)

返回类型：int

参数：

类型参数名称
struct block_device *bdev
fmode_tmode
unsigned intcmd
unsigned longarg
121  __user乘cdread_audio
122  __user乘cdread_audio32
124  __user乘datap
126  cdread_audio等于Allocate user-space memory for the duration of a single system call,* in order to marshall parameters inside a compat thunk.
127  cdread_audio32等于A pointer passed in from user mode. This should not* be used for syscall parameters, just declare them* as pointers because the syscall entry code will have* appropriately converted them already.
129  如果copy_in_user( & ame address , & addr, (cdread_audio32的长度 - sizeof(compat_caddr_t)))则返回:负EFAULT
135  如果Careful: we have to cast the result to the type of the pointer* for sign reasons(data, & buf)则返回:负EFAULT
137  datap等于A pointer passed in from user mode. This should not* be used for syscall parameters, just declare them* as pointers because the syscall entry code will have* appropriately converted them already.
138  如果put_user - Write a simple value into user space(datap, & ame buffer (size: nframes*2352 bytes) )则返回:负EFAULT
141  返回:__blkdev_driver_ioctl(bdev, mode, cmd, (unsignedlong)cdread_audio)
调用者
名称描述
compat_blkdev_driver_ioctl