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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
commit | 36d22d82aa202bb199967e9512281e9a53db42c9 (patch) | |
tree | 105e8c98ddea1c1e4784a60a5a6410fa416be2de /docs/nspr/reference/pr_createfilemap.rst | |
parent | Initial commit. (diff) | |
download | firefox-esr-upstream.tar.xz firefox-esr-upstream.zip |
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | docs/nspr/reference/pr_createfilemap.rst | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/docs/nspr/reference/pr_createfilemap.rst b/docs/nspr/reference/pr_createfilemap.rst new file mode 100644 index 0000000000..c347d94e5e --- /dev/null +++ b/docs/nspr/reference/pr_createfilemap.rst @@ -0,0 +1,66 @@ +PR_CreateFileMap +================ + +Creates a file mapping object. + + +Syntax +------ + +.. code:: + + #include <prio.h> + + PRFileMap* PR_CreateFileMap( + PRFileDesc *fd, + PRInt64 size, + PRFileMapProtect prot); + + +Parameters +~~~~~~~~~~ + +The function has the following parameters: + +``fd`` + A pointer to a :ref:`PRFileDesc` object representing the file that is to + be mapped to memory. +``size`` + Size of the file specified by ``fd``. +``prot`` + Protection option for read and write accesses of a file mapping. This + parameter consists of one of the following options: + + - :ref:`PR_PROT_READONLY`. Read-only access. + - :ref:`PR_PROT_READWRITE`. Readable, and write is shared. + - :ref:`PR_PROT_WRITECOPY`. Readable, and write is private + (copy-on-write). + + +Returns +~~~~~~~ + +- If successful, a file mapping of type :ref:`PRFileMap`. +- If unsuccessful, ``NULL``. + + +Description +----------- + +The ``PRFileMapProtect`` enumeration used in the ``prot`` parameter is +defined as follows: + +.. code:: + + typedef enum PRFileMapProtect { + PR_PROT_READONLY, + PR_PROT_READWRITE, + PR_PROT_WRITECOPY + } PRFileMapProtect; + +:ref:`PR_CreateFileMap` only prepares for the mapping a file to memory. The +returned file-mapping object must be passed to :ref:`PR_MemMap` to actually +map a section of the file to memory. + +The file-mapping object should be closed with a :ref:`PR_CloseFileMap` call +when it is no longer needed. |