► |  | The Racket Foreign Interface

1 | Overview
2 | Loading Foreign Libraries
3 | C Types
4 | Pointer Functions
5 | Derived Utilities
6 | Miscellaneous Support
7 | Unexported Primitive Functions
| Bibliography
| Index

▼ | 5 | Derived Utilities

5.1 | Safe Homogenous Vectors
5.2 | Safe C Vectors
5.3 | Tagged C Pointer Types
5.4 | Defining Bindings
5.5 | Allocation and Finalization
5.6 | Custodian Shutdown Registration
5.7 | Atomic Execution
5.8 | Speculatively Atomic Execution
5.9 | Objective-C FFI
5.10 | Cocoa Foundation
5.11 | COM (Common Object Model)
5.12 | File Security-Guard Checks
5.13 | Windows API Helpers

On this page:

security-guard-check-file
_ file/ guard
_ file/ r
_ file/ rw

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#### 5.12`` File Security-Guard Checks

(require ffi/file)

> > procedure

> > (security-guard-check-file who path perms) → void?

> who : symbol?
> path : path-string?
> perms : (listof (or/c 'read 'write 'execute 'delete 'exists))

Checks whether (current-security-guard) permits access to the file specified by path with the permissions perms. See make-security-guard for more information on perms.

The symbol who should be the name of the function on whose behalf the security check is performed; it is passed to the security guard to use in access-denied errors.

> > procedure

> > (_file/guard perms [who]) → ctype?

> perms : (listof (or/c 'read 'write 'execute 'delete 'exists))
> who : symbol? = '_file/guard

Like _file and _path, but conversion from Racket to C first completes the path using path->complete-path then cleanses it using cleanse-path, then checks that the current security guard grants access on the resulting complete path with perms. As an output value, identical to _path.

> > value

> > _file/r : ctype?

> > value

> > _file/rw : ctype?

Equivalent to (_file/guard '(read)) and (_file/guard '(read write)), respectively.
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