[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.

[libc] Fix compilation warnings on 32-bit archs (#97745)

timespec's tv_nsec is a long int, which has different sizes in 32-bit and 64-bit platforms, so this patch adds one and fixes another static_c

[libc] Fix compilation warnings on 32-bit archs (#97745)

timespec's tv_nsec is a long int, which has different sizes in 32-bit and 64-bit platforms, so this patch adds one and fixes another static_cast throw warnings in 32-bit archs

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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][cleanup] Fix most conversion warnings

This patch is large, but is almost entirely just adding casts to calls
to syscall_impl. Much of the work was done programatically, with human
checking wh

[libc][cleanup] Fix most conversion warnings

This patch is large, but is almost entirely just adding casts to calls
to syscall_impl. Much of the work was done programatically, with human
checking when the syntax or types got confusing.

Reviewed By: mcgrathr

Differential Revision: https://reviews.llvm.org/D156950

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[libc] NFC: Fix build on systems that don't have linux/time_types.h

This broke some bots that don't have linux/time_types.h available
(libc-x86_64-debian-*).

The header is needed because of __kerne

[libc] NFC: Fix build on systems that don't have linux/time_types.h

This broke some bots that don't have linux/time_types.h available
(libc-x86_64-debian-*).

The header is needed because of __kernel_timespec, and since this is
only needed when SYS_sched_rr_get_interval_time64 is available, guarding
the include should fix the broken bot.

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[libc] Add support to compile some syscalls on 32 bit platform

This patch adds a bunch of ifdefs to handle the 32 bit versions of
some syscalls, which often only append a 64 to the name of the sysca

[libc] Add support to compile some syscalls on 32 bit platform

This patch adds a bunch of ifdefs to handle the 32 bit versions of
some syscalls, which often only append a 64 to the name of the syscall
(with exception of SYS_lseek -> SYS_llseek and SYS_futex ->
SYS_futex_time64)

This patch also tries to handle cases where wait4 is not available
(as in riscv32): to implement wait, wait4 and waitpid when wait4 is
not available, we check for alternative wait calls and ultimately rely
on waitid to implement them all.

In riscv32, only waitid is available, so we need it to support this
platform.

Reviewed By: michaelrj

Differential Revision: https://reviews.llvm.org/D148371

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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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