libc: switch to __weak_symbol for fortified interpose stubs

GCC doesn't like `#pragma weak macro(foo)`, but that's fine; just slap
a __weak_symbol on the definition to more reliably make it weak
any

libc: switch to __weak_symbol for fortified interpose stubs

GCC doesn't like `#pragma weak macro(foo)`, but that's fine; just slap
a __weak_symbol on the definition to more reliably make it weak
anyways.

Reviewed by: kib (earlier version), markj
Sponsored by: Klara, Inc.
Sponsored by: Stormshield
Differential Revision: https://reviews.freebsd.org/D45976

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include: ssp: fortify poll/ppoll from <poll.h>

For poll/ppoll we just need to bounds-check the poll array that we're
about to write out to.

Reviewed by: kib, markj (earlier version)
Sponsored by: K

include: ssp: fortify poll/ppoll from <poll.h>

For poll/ppoll we just need to bounds-check the poll array that we're
about to write out to.

Reviewed by: kib, markj (earlier version)
Sponsored by: Klara, Inc.
Sponsored by: Stormshield
Differential Revision: https://reviews.freebsd.org/D45680

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libc: INTERPOS_SYS macro for interposed syscalls

This macro makes uses the __sys_<foo>_t typedefs from libsys.h to
greatly simplify calling functions in the interposing table.

Reviewed by: kib
Diff

libc: INTERPOS_SYS macro for interposed syscalls

This macro makes uses the __sys_<foo>_t typedefs from libsys.h to
greatly simplify calling functions in the interposing table.

Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D44389

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lib{c,sys}: return wrapped syscall APIs to libc

These provide standard APIs, but are implemented using another system
call (e.g., pipe implemented in terms of pipe2) or are interposed by the
threadi

lib{c,sys}: return wrapped syscall APIs to libc

These provide standard APIs, but are implemented using another system
call (e.g., pipe implemented in terms of pipe2) or are interposed by the
threading library to support cancelation.

After discussion with kib (see D44111), I've concluded that it is
better to keep most public interfaces in libc with as little
as possible in libsys.

Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D44241

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