[libc] remove #include <fcntl.h> and add proxy or type (#113836)

[libc] Move libc_errno inside of LIBC_NAMESPACE (#80774)

Having libc_errno outside of the namespace causes versioning issues when
trying to link the tests against LLVM-libc. Most of this patch is j

[libc] Move libc_errno inside of LIBC_NAMESPACE (#80774)

Having libc_errno outside of the namespace causes versioning issues when
trying to link the tests against LLVM-libc. Most of this patch is just
moving libc_errno inside the namespace in tests. This isn't necessary in
the function implementations since those are already inside the
namespace.

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[libc][NFC] Use specific ASSERT macros to test errno (#79573)

This patch provides specific test macros to deal with `errno`.
This will help abstract away the differences between unit test and integ

[libc][NFC] Use specific ASSERT macros to test errno (#79573)

This patch provides specific test macros to deal with `errno`.
This will help abstract away the differences between unit test and integration/hermetic tests in #79319.
In one case we use `libc_errno` which is a struct, in the other case we deal directly with `errno`.

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[libc] fix unit tests (#75361)

Fixes #75261

[libc] Fix accidental LIBC_NAMESPACE_syscall definition (#69548)

Building helloworld.c currently errors with "undefined symbol:
__llvm_libc_syscall"

See: https://github.com/llvm/llvm-project/pul

[libc] Fix accidental LIBC_NAMESPACE_syscall definition (#69548)

Building helloworld.c currently errors with "undefined symbol:
__llvm_libc_syscall"

See: https://github.com/llvm/llvm-project/pull/67032

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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 ErrnoSetterMatcher handle logging floating point values.

Along the way, couple of additional things have been done:

1. Move `ErrnoSetterMatcher.h` to `test/UnitTest` as all other matche

[libc] Make ErrnoSetterMatcher handle logging floating point values.

Along the way, couple of additional things have been done:

1. Move `ErrnoSetterMatcher.h` to `test/UnitTest` as all other matchers live
there now.
2. `ErrnoSetterMatcher` ignores matching `errno` on GPUs.

Reviewed By: jhuber6

Differential Revision: https://reviews.llvm.org/D151129

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[libc][NFC] Standardize missing syscalls error messages.

This patch standardizes the error messages when a syscall is not
available to be in the format: "ABC and DEF syscalls are not available."

Re

[libc][NFC] Standardize missing syscalls error messages.

This patch standardizes the error messages when a syscall is not
available to be in the format: "ABC and DEF syscalls are not available."

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D148373

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[libc] Enable __llvm_libc_syscall and fork

This patch enables the remaining calls from unistd.

The test cases had to be updated to:
1. Use SYS_symlinkat if SYS_symlink is not available
2. Use SYS_r

[libc] Enable __llvm_libc_syscall and fork

This patch enables the remaining calls from unistd.

The test cases had to be updated to:
1. Use SYS_symlinkat if SYS_symlink is not available
2. Use SYS_readlinkat if SYS_readlink is not available
3. Use SYS_unlinkat if SYS_unlink is not available
4. Use SYS_openat if SYS_open is not available

We also abort compilation if neither of the syscalls mentioned above are
available.

Differential Revision: https://reviews.llvm.org/D146161

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[libc][NFC] Switch unistd.h tests to libc_errno.

[libc][NFC] Move UnitTest and IntegrationTest to the 'test' directory.

This part of the effort to make all test related pieces into the `test`
directory. This helps is excluding test related pieces

[libc][NFC] Move UnitTest and IntegrationTest to the 'test' directory.

This part of the effort to make all test related pieces into the `test`
directory. This helps is excluding test related pieces in a straight
forward manner if LLVM_INCLUDE_TESTS is OFF. Future patches will also move
the MPFR wrapper and testutils into the 'test' directory.

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[libc] add syscall function

Add the syscall wrapper function and tests. It's implemented using a
macro to guarantee the minimum number of arguments.

Reviewed By: sivachandra, lntue

Differential Re

[libc] add syscall function

Add the syscall wrapper function and tests. It's implemented using a
macro to guarantee the minimum number of arguments.

Reviewed By: sivachandra, lntue

Differential Revision: https://reviews.llvm.org/D134919

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