[libc] Fix scheduler test incorrectly guessing user privileges (#95562)

Non-root users may be able to set real-time scheduling policies. Don't
expect failure to set real-time scheduling policies ba

[libc] Fix scheduler test incorrectly guessing user privileges (#95562)

Non-root users may be able to set real-time scheduling policies. Don't
expect failure to set real-time scheduling policies based on UID.
Instead, check that if it fails, it is either due to missing privileges,
or unsupported parameters if the scheduling policy is not mandated by
POSIX.

Fixes #95564.

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[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] 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] Fix sched_getscheduler return value

This patch fixes the return time for sched_getscheduler which was set to
always zero. The syscall documentation, however, defines:

On success, sched_getsc

[libc] Fix sched_getscheduler return value

This patch fixes the return time for sched_getscheduler which was set to
always zero. The syscall documentation, however, defines:

On success, sched_getscheduler() returns the policy for the thread (a
nonnegative integer).

I also changed the return type for sched_setscheduler, but this change
didn't impact and test case.

This patch also removes the duplicated code from param_and_scheduler_test.cpp
and adds SCHED_BATCH and SCHED_IDLE to the tests.

Reviewed By: michaelrj

Differential Revision: https://reviews.llvm.org/D156700

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[LIBC] Implement remainder of posix 'sched.h' minus `SCHED_SPORADIC`

Includes macros:
linux/SCHED_OTHER // posix req
linux/SCHED_FIFO // posix req
linux/SCHED_RR // posix req
linux/S

[LIBC] Implement remainder of posix 'sched.h' minus `SCHED_SPORADIC`

Includes macros:
linux/SCHED_OTHER // posix req
linux/SCHED_FIFO // posix req
linux/SCHED_RR // posix req
linux/SCHED_BATCH
linux/SCHED_ISO
linux/SCHED_IDLE
linux/SCHED_DEADLINE

Includes types:
struct sched_param { int sched_priority; }

Includes functions:
sched_setparam
sched_getparam
sched_setscheduler
sched_getscheduler
sched_get_priority_max
sched_get_priority_min
sched_rr_get_interval

Reviewed By: michaelrj

Differential Revision: https://reviews.llvm.org/D148069

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