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2022-10-19remove LFS64 programming interfaces (macro-only) from _GNU_SOURCERich Felker-1/+1
these badly pollute the namespace with macros whenever _GNU_SOURCE is defined, which is always the case with g++, and especially tends to interfere with C++ constructs. as our implementation of these was macro-only, their removal cannot affect any existing binaries. at the source level, portable software should be prepared for them not to exist. for now, they are left in place with explicit _LARGEFILE64_SOURCE. this provides an easy temporary path for integrators/distributions to get packages building again right away if they break while working on a proper, upstreamable fix. the intent is that this be a very short-term measure and that the macros be removed entirely in the next release cycle.
2021-02-15sys/mman.h: add MAP_HUGE_16KB from linux v5.10Szabolcs Nagy-0/+1
see linux commit e47168f3d1b14af5281cf50c59561d59d28201f9 powerpc/8xx: Support 16k hugepages with 4k pages
2020-09-09sys/mman.h: add MREMAP_DONTUNMAP from linux v5.7Szabolcs Nagy-0/+1
it remaps anon mappings without unmapping the original. chromeos plans to use it with userfaultfd, see: linux commit e346b3813067d4b17383f975f197a9aa28a3b077 mm/mremap: add MREMAP_DONTUNMAP to mremap()
2019-12-30sys/mman.h: add MADV_COLD and MADV_PAGEOUT from linux v5.4Szabolcs Nagy-0/+2
These were mainly introduced so android can optimize the memory usage of unused apps. MADV_COLD hints that the memory range is currently not needed (unlike with MADV_FREE the content is not garbage, it needs to be swapped): linux commit 9c276cc65a58faf98be8e56962745ec99ab87636 mm: introduce MADV_COLD MADV_PAGEOUT hints that the memory range is not needed for a long time so it can be reclaimed immediately independently of memory pressure (unlike with MADV_DONTNEED the content is not garbage): linux commit 1a4e58cce84ee88129d5d49c064bd2852b481357 mm: introduce MADV_PAGEOUT
2019-03-13sys/mman.h: add new hugetlb mmap flags from linux v4.19Szabolcs Nagy-0/+2
aarch64 supports 32MB and 512MB hugetlb page sizes too. added in linux commit 20916d4636a9b3c1bf562b305f91d126771edaf9
2018-06-20add memfd_create syscall wrapperSzabolcs Nagy-0/+5
memfd_create was added in linux v3.17 and glibc has api for it.
2018-06-20add mlock2 linux syscall wrapperSzabolcs Nagy-3/+8
mlock2 syscall was added in linux v4.4 and glibc has api for it. It falls back to mlock in case of flags==0, so that case works even on older kernels. MLOCK_ONFAULT is moved under _GNU_SOURCE following glibc.
2018-06-19add MAP_FIXED_NOREPLACE from linux v4.17Szabolcs Nagy-0/+1
to map at a fixed address without unmapping underlying mappings (fails with EEXIST unlike MAP_FIXED), new in linux commits 4ed28639519c7bad5f518e70b3284c6e0763e650 and a4ff8e8620d3f4f50ac4b41e8067b7d395056843.
2018-02-22add MAP_SYNC and MAP_SHARED_VALIDATE from linux v4.15Szabolcs Nagy-0/+2
for synchronous page faults, new in linux commit 1c9725974074a047f6080eecc62c50a8e840d050 and b6fb293f2497a9841d94f6b57bd2bb2cd222da43 note that only targets that use asm-generic/mman.h have this new flag defined, so undef it on other targets (mips*, powerpc*).
2018-02-22sys/{mman,shm}.h: add {MAP,SHM}_HUGE_ macros from linux uapiSzabolcs Nagy-0/+13
*_HUGE_SHIFT, *_HUGE_2MB, *_HUGE_1GB are documented in the man page, so add all of the *_HUGE_* macros from linux uapi. if MAP_HUGETLB is set, top bits of the mmap flags encode the page size. see the linux commit aafd4562dfee81a40ba21b5ea3cf5e06664bc7f6 if SHM_HUGETLB is set, top bits of the shmget flags encode the page size. see the linux commit 4da243ac1cf6aeb30b7c555d56208982d66d6d33 *_HUGE_16GB is defined unsigned to avoid signed left shift ub.
2018-02-22sys/mman.h: add MADV_WIPEONFORK from linux v4.14Szabolcs Nagy-0/+2
allows zeroing anonymous private pages inherited by a child process. new in linux commit d2cd9ede6e193dd7d88b6d27399e96229a551b19
2016-03-19add MADV_FREE madvise command from linux v4.5Szabolcs Nagy-0/+1
allows the os to free the marked pages lazily on memory pressure. expected to increase malloc performance. new in linux commit 854e9ed09dedf0c19ac8640e91bcc74bc3f9e5c9
2016-03-18deduplicate bits/mman.hSzabolcs Nagy-0/+59
currently five targets use the same mman.h constants and the rest share most constants too, so move them to sys/mman.h before the bits/mman.h include where the differences can be corrected by redefinition of the macros. this fixes two minor bugs: POSIX_MADV_DONTNEED was wrong on most targets (it should be the same as MADV_DONTNEED), and sh defined the x86-only MAP_32BIT mmap flag.
2016-01-26add MCL_ONFAULT and MLOCK_ONFAULT mlockall and mlock2 flagsSzabolcs Nagy-0/+1
they lock faulted pages into memory (useful when a small part of a large mapped file needs efficient access), new in linux v4.4, commit b0f205c2a3082dd9081f9a94e50658c5fa906ff1 MLOCK_* is not in the POSIX reserved namespace for sys/mman.h
2015-01-30move MREMAP_MAYMOVE and MREMAP_FIXED out of bitsTrutz Behn-0/+2
the definitions are generic for all kernel archs. exposure of these macros now only occurs on the same feature test as for the function accepting them, which is believed to be more correct.
2014-01-07fix signedness of pgoff argument to remap_file_pagesRich Felker-1/+1
both the kernel and glibc agree that this argument is unsigned; the incorrect type ssize_t came from erroneous man pages.
2012-09-16add clock_adjtime, remap_file_pages, and syncfs syscall wrappersRich Felker-0/+5
patch by Justin Cormack, with slight modification
2012-09-09mincore syscall wrapperRich Felker-0/+1
2012-09-07default features: make musl usable without feature test macrosRich Felker-0/+2
the old behavior of exposing nothing except plain ISO C can be obtained by defining __STRICT_ANSI__ or using a compiler option (such as -std=c99) that predefines it. the new default featureset is POSIX with XSI plus _BSD_SOURCE. any explicit feature test macros will inhibit the default. installation docs have also been updated to reflect this change.
2012-06-04_GNU_SOURCE is supposed to imply _LARGEFILE64_SOURCERich Felker-1/+1
this is ugly and stupid, but now that the *64 symbol names exist, a lot of broken GNU software detects them in configure, then either breaks during build due to missing off64_t definition, or attempts to compile without function declarations/prototypes. "fixing" it here is easier than telling everyone to add yet another feature test macro to their builds.
2012-05-22support _BSD_SOURCE feature test macroRich Felker-0/+3
patch by Isaac Dunham. matched closely (maybe not exact) to glibc's idea of what _BSD_SOURCE should make visible.
2012-05-04add *64 junk for sys/*.h headersRich Felker-0/+5
2011-03-03namespace cleanup in sys/mman.hRich Felker-1/+3
2011-02-12initial check-in, version 0.5.0v0.5.0Rich Felker-0/+37
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