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stdio types use the struct tag names from glibc libio to match C++
ABI.
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notes added by maintainer:
this function is a GNU extension. it was chosen over the similar BSD
function funopen because the latter depends on fpos_t being an
arithmetic type as part of its public API, conflicting with our
definition of fpos_t and with the intent that it be an opaque type. it
was accepted for inclusion because, despite not being widely used, it
is usually very difficult to extricate software using it from the
dependency on it.
calling pattern for the read and write callbacks is not likely to
match glibc or other implementations, but should work with any
reasonable callbacks. in particular the read function is never called
without at least one byte being needed to satisfy its caller, so that
spurious blocking is not introduced.
contracts for what callbacks called from inside libc/stdio can do are
always complicated, and at some point still need to be specified
explicitly. at the very least, the callbacks must return or block
indefinitely (they cannot perform nonlocal exits) and they should not
make calls to stdio using their own FILE as an argument.
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TCP_ULP is new in linux commit 734942cc4ea6478eed125af258da1bdbb4afe578
TCP_MD5SIG_EXT is new in 8917a777be3ba566377be05117f71b93a5fd909d
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for getting/setting write lifetime hints fcntl commands were
added in linux commit c75b1d9421f80f4143e389d2d50ddfc8a28c8c35
added under _GNU_SOURCE || _BSD_SOURCE, since RWH_* life time
hints are not in the POSIX reserved namespace.
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SCM_TIMESTAMPING_PKTINFO is new in aad9c8c470f2a8321a99eb053630ce0e199558d6
SO_PEERGROUPS is new in 28b5ba2aa0f55d80adb2624564ed2b170c19519e
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new in linux commit 531b374834c891ae2abf800693074df35a7d1a36
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SO_MEMINFO added in linux commit a2d133b1d465016d0d97560b11f54ba0ace56d3e
SO_INCOMING_NAPI_ID added in 6d4339028b350efbf87c61e6d9e113e5373545c9
SO_COOKIE added in 5daab9db7b65df87da26fd8cfa695fb9546a1ddb
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two new stats for SCM_TIMESTAMPING_OPT_STATS, added in linux commit
7e98102f489775d8c000884fca8a0d995ea688a9
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new in linux commit 19f6d3f3c8422d65b5e3d2162e30ef07c6e21ea2
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new in linux commit 69ae543969abeba48e04dd93277684c8c0895f3b
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linux commit 575b1967e10a1f3038266244d2c7a3ca6b99fed8 moved timerfd
apis to a new uapi header which showed musl was missing this flag.
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min max mtu size definitions mostly for drivers.
new in linux commits a52ad514fdf3b8a57ca4322c92d2d8d5c6182485 and
d894be57ca92c8a8819ab544d550809e8731137b
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added in linux commit 70ecc24841326396a827deb55c3fefac582a729d
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for tcp timestamp control messages, new in linux commit
1c885808e45601b2b6f68b30ac1d999e10b6f606
and export time measurements via tcp_info, added in linux commit
efd90174167530c67a54273fd5d8369c87f9bd32
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patch by Jörg Krause.
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it's in the reserved namespace for the latter, where it seems it was
historically defined, and some programs expect to find it there.
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since setlocale(cat, NULL) is required to return the setting for the
global locale, there is no standard mechanism to obtain the name of
the currently active thread-local locale set by uselocale. this makes
it impossible for application/library software to load appropriate
translations, etc. unless using the gettext implementation provided by
libc, which has privileged access to libc internals.
to fill this gap, glibc introduced the _NL_LOCALE_NAME macro which can
be used with nl_langinfo to obtain the name. GNU gettext/gnulib code
already use this functionality on glibc, and can easily be adapted to
make use of it on non-glibc systems if it's available; for other
systems they poke at locale implementation internals, which we want to
avoid. this patch provides a compatible interface to the one glibc
introduced.
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The two functions str{,n}casecmp_l are specified to be declared in
<strings.h> which is already included from <string.h> under _GNU_SOURCE.
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the bit is reserved anyway for ABI-compat reasons; this documents it
and makes it so we can have posix_spawnattr_setflags check for flag
validity without hard-coding an anonymous bit value.
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this functionality has been adopted for inclusion in the next issue of
POSIX as the result of Austin Group issue #1044.
based on patch by Daurnimator.
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export tcp data delivery rate in tcp_info struct.
see linux commit eb8329e0a04db0061f714f033b4454326ba147f4
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for handling file locking on overlayfs.
see linux commit c568d68341be7030f5647def68851e469b21ca11
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this has been slated for removal for a long time. there is
fundamentally no way to implement stdarg without compiler assistance;
any attempt to do so has serious undefined behavior; its working
depends not just (as a common misconception goes) on ABI, but also on
assumptions about compiler code generation internal to a translation
unit, which is not subject to external ABI constraints.
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alpha and s390x gratuitously use 64-bit entries (wasting 2x space and
cache utilization) despite the values always being 32-bit.
based on patch by Bobby Bingham, with changes suggested by Alexander
Monakov to use the public Elf_Symndx type from link.h (and make it
properly variable by arch) rather than adding new internal
infrastructure for handling the type.
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based on patch by Timo Teräs:
While generally this is a bad API, it is the only existing API to
affect c++ (std::thread) and c11 (thrd_create) thread stack size.
This patch allows applications only to increate stack and guard
page sizes.
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the linux kernel uapi headers provide their own definitions of the
structures from netinet/in.h, resulting in errors when a program
includes both the standard libc header and one or more of the
networking-related kernel headers that pull in the kernel definitions.
as before, we do not attempt to support the case where kernel headers
are included before the libc ones, since the kernel definitions may
have subtly incorrect types, namespace violations, etc. however, we
can easily support the inclusion of the kernel headers after the libc
ones, since the kernel headers provide a public interface for
suppressing their definitions. this patch adds the necessary macro
definitions for such suppression.
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the value 19991006 for __RES implies availability of res_ninit and
related functions that take a resolver state argument; these are not
supported since our resolver is stateless. instead claim support for
just the older API by defining __RES to 19960801.
based on patch by Dmitrij D. Czarkoff.
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this header is XSI-shaded itself and thus does not need to limit
specific content to _XOPEN_SOURCE.
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reported and changes suggested by Daniel Sabogal.
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inclusion of these names was unintentional and in most cases is a
namespace violation. Daniel Sabogal tracked down and reported these.
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ETH_P_HSR (IEC 62439-3 HSRv1) added in
linux 4.7 commit ee1c27977284907d40f7f72c2d078d709f15811f
ETH_P_TSN (IEEE 1722) added in
linux 4.3 commit 1ab1e895492d8084dfc1c854efacde219e56b8c1
this constant breaks the ascending order to match the kernel header
ETH_P_XDSA (Multiplexed DSA protocol) added in
linux 3.18 commit 3e8a72d1dae374cf6fc1dba97cec663585845ff9
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ARPHRD_6LOWPAN (IPv6 over LoWPAN) added in
linux 3.14 commit 0abc652c796dab74d34d60473ec5594cd21620be
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the _CS_V6_ENV and _CS_V7_ENV constants are required to be available for use
with confstr. glibc defines these constants with values 1148 and 1149,
respectively.
the only missing (and required) confstr constants are
_CS_POSIX_V7_THREADS_CFLAGS and _CS_POSIX_V7_THREADS_LDFLAGS which remain
unavailable in glibc.
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the thread name is displayed by gdb's "info threads".
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add union field that is used in the kernel for SIT/GRE tunneling ICMPv4
messages. see linux commit 20e1954fe238dbe5f8d3a979e593fe352bd703cf
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another kernel internal state exposure for checkpoint-restore.
see linux commit b1ed4c4fa9a5ccf325184fd90edc50978ef6e33a
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aarch64, arm, mips, mips64, mipsn32, powerpc, powerpc64 and sh have
cpu feature bits defined in linux for AT_HWCAP auxv entry, so expose
those in sys/auxv.h
it seems the mips hwcaps were never exposed to userspace neither
by linux nor by glibc, but that's most likely an oversight.
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sync with gabi: http://www.sco.com/developers/gabi/latest/ch4.eheader.html
EM_BPF is new in linux v4.8 and officially assigned:
https://lists.iovisor.org/pipermail/iovisor-dev/2016-June/000266.html
added related relocs too.
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see linux commit 6389eaa7fa9c3ee6c7d39f6087b86660d17236ac
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since cpu sets can be dynamically allocated and have variable size,
accessing their contents via ->__bits is not valid; performing pointer
arithmetic outside the range of the size of the declared __bits array
results in undefined beahavior. instead, only use cpu_set_t for
fixed-size cpu set objects (instantiated by the caller) and as an
abstract pointer type for dynamically allocated ones. perform all
accesses simply by casting the abstract pointer type cpuset_t * back
to unsigned long *.
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these functions had been implemented, but prototypes were not made available
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glibc, freebsd, and openbsd use character pointers (caddr_t) for
these fields. only linux uses void pointer for the ifru_data type.
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this reverts commit 2c1f8fd5da3306fd7c8a2267467e44eb61f12dd4. without
the _Noreturn attribute, the compiler cannot use asserts to perform
reachability/range analysis. this leads to missed optimizations and
spurious warnings.
the original backtrace problem that prompted the removal of _Noreturn
was not clearly documented at the time, but it seems to happen only
when libc was built without -g, which also breaks many other
backtracing cases.
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O_FSYNC was never defined and is legacy/wrong, nothing seems to use it.
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only matters if swapcontext is used in a signal handler running on an
altstack, new in linux commit 2a74213838104a41588d86fd5e8d344972891ace
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for GPRS tunneling protocol, new in linux commit
459aa660eb1d8ce67080da1983bb81d716aa5a69
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macros for qualcom ip router protocol, new in linux commit
bdabad3e363d825ddf9679dd431cca0b2c30f881
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