process_vm_rw

Name:process_vm_rw - check iovecs before calling core routine*@pid: PID of process to read/write from/to*@lvec: iovec array specifying where to copy to/from locally*@liovcnt: size of lvec array*@rvec: iovec array specifying where to copy to/from in the other

Proto:static ssize_t process_vm_rw(pid_t pid, const struct iovec __user *lvec, unsigned long liovcnt, const struct iovec __user *rvec, unsigned long riovcnt, unsigned long flags, int vm_write)

Type:ssize_t

Parameter:

Type	Parameter	Name
pid_t	pid
const struct iovec __user *	lvec
unsigned long	liovcnt
const struct iovec __user *	rvec
unsigned long	riovcnt
unsigned long	flags
int	vm_write

263

iov_l = iovstack_l

264

iov_r = iovstack_r

267

dir = If vm_write Then WRITE Else generic data direction definitions

269

If flags != 0 Then Return -EINVAL

273

rc = mport_iovec() - Copy an array of &struct iovec from userspace* into the kernel, check that it is valid, and initialize a new* &struct iov_iter iterator to access it.*@type: One of %READ or %WRITE.*@uvector: Pointer to the userspace array.

274

If rc < 0 Then Return rc

276

If Not iov_iter_count( & iter) Then Go to free_iovecs

279

rc = rw_copy_check_uvector(Flag for rw_copy_check_uvector and compat_rw_copy_check_uvector* that indicates that they should check the contents of the iovec are* valid, but not check the memory that the iovec elements* points too., rvec, riovcnt, UIO_MAXIOV shall be at least 16 1003.1g (5.4.1.1), iovstack_r, & iov_r)

281

If rc <= 0 Then Go to free_iovecs

284

rc = process_vm_rw_core - core of reading/writing pages from task specified*@pid: PID of process to read/write from/to*@iter: where to copy to/from locally*@rvec: iovec array specifying where to copy to/from in the other process*@riovcnt: size of rvec

286

287

If iov_r != iovstack_r Then kfree(iov_r)

289

291

Return rc

**Caller**
Name	Describe
SYSCALL_DEFINE6
SYSCALL_DEFINE6

Source code conversion tool public plug-in interface	X
Support c/c++/esqlc/java Oracle/Informix/Mysql Plug-in can realize: logical Report Code generation and batch code conversion