[libc] Added static casts to fix implicit conversion warnings in 32-bit systems

This patch fixes:

randomness.h and getauxval.cpp were passing ssize_t as size_t
kernel_statx.h was assigning an ui

[libc] Added static casts to fix implicit conversion warnings in 32-bit systems

This patch fixes:

randomness.h and getauxval.cpp were passing ssize_t as size_t
kernel_statx.h was assigning an uint64_t to uintptr_t
fopencookie.cpp was trying to create a FileIOResult using ssize_t but the constructor expected a size_t
thread.h was trying to call free_stack (which takes a size_t) with an unsigned long long. free_stack does the calculations using uintptr_t, so I changed the passing values to size_t

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[libc] Migrate to using LIBC_NAMESPACE_DECL for namespace declaration (#98597)

This is a part of #97655.

Revert "[libc] Migrate to using LIBC_NAMESPACE_DECL for namespace declaration" (#98593)

Reverts llvm/llvm-project#98075

bots are broken

[libc] Migrate to using LIBC_NAMESPACE_DECL for namespace declaration (#98075)

This is a part of #97655.

Reland: [libc] Move off_t and stdio macros to proxy hdrs (#98384)

reland of https://github.com/llvm/llvm-project/pull/98215

Additionally adds proxy headers for FILE and the fopencookie types

The a

Reland: [libc] Move off_t and stdio macros to proxy hdrs (#98384)

reland of https://github.com/llvm/llvm-project/pull/98215

Additionally adds proxy headers for FILE and the fopencookie types

The arm32 build has been failing due to redefinitions of the off_t type.
This patch fixes this by moving off_t to a proper proxy header. To do
this, it also moves stdio macros to a proxy header to hopefully avoid
including this proxy header alongside this public stdio.h.

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Revert "[libc] Move off_t and stdio macros to proxy hdrs" (#98242)

Reverts llvm/llvm-project#98215

Breaks linux bots

[libc] Move off_t and stdio macros to proxy hdrs (#98215)

The arm32 build has been failing due to redefinitions of the off_t type.
This patch fixes this by moving off_t to a proper proxy header. To

[libc] Move off_t and stdio macros to proxy hdrs (#98215)

The arm32 build has been failing due to redefinitions of the off_t type.
This patch fixes this by moving off_t to a proper proxy header. To do
this, it also moves stdio macros to a proxy header to hopefully avoid
including this proxy header alongside this public stdio.h.

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[libc][NFC] Adjust use of off_t internally (#68269)

This patch includes changes related to the use of off_t in libc,
targeted at 32-bit systems: in several places, the offset is used either
as a l

[libc][NFC] Adjust use of off_t internally (#68269)

This patch includes changes related to the use of off_t in libc,
targeted at 32-bit systems: in several places, the offset is used either
as a long or an off_t (64-bit signed int), but in 32-bit systems a long
type is only 32 bits long.

Fix a warning in mmap where a long offset is expected, but we were
passing an off_t. A static_cast and a comment were added to explain
that we know we are ignoring the upper 32-bit of the off_t in 32-bit
systems.
The code in pread and pwrite was slightly improved to remove a
#ifdef LIBC_TARGET_ARCH_IS_RISCV32; we are using an if constexpr now.
The Linux file operations were changed to use off_t instead of a long
where applicable. No changes were made to the standard API, e.g.,
ftell returns the offset as an int so we added a static_cast and a
comment explaining that this will cause a loss of integer precision
in 32-bit systems.

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[libc] Mass replace enclosing namespace (#67032)

This is step 4 of
https://discourse.llvm.org/t/rfc-customizable-namespace-to-allow-testing-the-libc-when-the-system-libc-is-also-llvms-libc/73079

[libc] Make close function of the internal File class cleanup the file object.

Before this change, a separate static method named cleanup was used to
cleanup the file. Instead, now the close method

[libc] Make close function of the internal File class cleanup the file object.

Before this change, a separate static method named cleanup was used to
cleanup the file. Instead, now the close method cleans up the full file
object using the platform's close function.

Reviewed By: lntue

Differential Revision: https://reviews.llvm.org/D153377

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[libc] Remove the requirement of a platform-flush operation in File abstraction.

The libc flush operation is not supposed to trigger a platform level
flush operation. See "Notes" on this Linux man p

[libc] Remove the requirement of a platform-flush operation in File abstraction.

The libc flush operation is not supposed to trigger a platform level
flush operation. See "Notes" on this Linux man page:
https://man7.org/linux/man-pages/man3/fflush.3.html

Reviewed By: michaelrj

Differential Revision: https://reviews.llvm.org/D153182

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[libc] move stdlib and stdio to new errno pattern

Fixes https://github.com/llvm/llvm-project/issues/61071

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D145191

[libc][NFC] Use operator delete to cleanup a File object.

The File API has been refactored to allow cleanup using operator delete.

Reviewed By: lntue

Differential Revision: https://reviews.llvm.or

[libc][NFC] Use operator delete to cleanup a File object.

The File API has been refactored to allow cleanup using operator delete.

Reviewed By: lntue

Differential Revision: https://reviews.llvm.org/D140574

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[libc] Handle allocation failures gracefully in FILE related API.

Few uses of free have not yet been replaced by the custom operator
delete yet. They will be done in a follow up patch.

Reviewed By:

[libc] Handle allocation failures gracefully in FILE related API.

Few uses of free have not yet been replaced by the custom operator
delete yet. They will be done in a follow up patch.

Reviewed By: lntue, michaelrj

Differential Revision: https://reviews.llvm.org/D140526

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[libc] move errno out of file internals

Now errno is only set by the terminal entrypoints, and not the internal
implementations. This patch is part of the larger effort to not set
errno in libc inte

[libc] move errno out of file internals

Now errno is only set by the terminal entrypoints, and not the internal
implementations. This patch is part of the larger effort to not set
errno in libc internal code: https://github.com/llvm/llvm-project/issues/59278

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D139576

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[libc] Add implementations of ftell.

Reviewed By: michaelrj, lntue

Differential Revision: https://reviews.llvm.org/D137395

[libc][NFC] Add a few compiler warning flags.

A bunch of cleanup to supress the new warnings is also done.

Reviewed By: abrachet

Differential Revision: https://reviews.llvm.org/D130723

[libc] Add the implementation of the GNU extension function fopencookie.

Reviewed By: lntue, michaelrj

Differential Revision: https://reviews.llvm.org/D124141