DesiredAccess in IoCreateFile

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Hello, Guys!

I have small question about 2 parameters of IoCreateFile. What means combination of DesiredAccess = SYNCHRONIZE and ShareAccess = 0? Is it full access to the file, can I read and write to file opened only with this flags?

Thanks!

Posted 16-Jan-12 3:22am

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amertarekt · Answer 1 · 2012-01-29T00:33:00

to know the mean of DesiredAccess values go there http://www.osronline.com/ddkx/kmarch/k111_9dte.htm[^]

share access:is means what to shared between threads on the program

FILE_SHARE_READ : all threads can read this file
FILE_SHARE_WRITE : all threads can write on this file
FILE_SHARE_DELETE : all threads can delete this file

casa cargo · Answer 2 · 2012-05-07T21:35:00

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The following standard specific access rights apply to all types of executive objects.

DELETE The caller can delete the object.

READ_CONTROL The caller can read the access control list (ACL) and ownership information for the file.

SYNCHRONIZE The caller can perform a wait operation on the object. (For example, the object can be passed to KeWaitForMultipleObjects.)

WRITE_DAC The caller can change the discretionary access control list (DACL) information for the object.

WRITE_OWNER The caller can change the ownership information for the file.

-----------------------------------------------------------------------------
ShareAccess
Specifies the type of share access that the caller would like to the file, as zero, or as one or a combination of the following:

ShareAccess flags Meaning

FILE_SHARE_READ The file can be opened for read access by other threads' calls to IoCreateFile.

FILE_SHARE_WRITE The file can be opened for write access by other threads' calls to IoCreateFile.

FILE_SHARE_DELETE The file can be opened for delete access by other threads' calls to IoCreateFile

DesiredAccess in IoCreateFile

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