Commit Graph

16 Commits

Author SHA1 Message Date
Rich Felker
1febd21d3f add time64 symbol name redirects to public headers, under arch control
a _REDIR_TIME64 macro is introduced, which the arch's alltypes.h is
expected to define, to control redirection of symbol names for
interfaces that involve time_t and derived types. this ensures that
object files will only be linked to libc interfaces matching the ABI
whose headers they were compiled against.

along with time32 compat shims, which will be introduced separately,
the redirection also makes it possible for a single libc (static or
shared) to be used with object files produced with either the old
(32-bit time_t) headers or the new ones after 64-bit time_t switchover
takes place. mixing of such object files (or shared libraries) in the
same program will also be possible, but must be done with care; ABI
between libc and a consumer of the libc interfaces is guaranteed to
match by the the symbol name redirection, but pairwise ABI between
consumers of libc that define interfaces between each other in terms
of time_t is not guaranteed to match.

this change adds a dependency on an additional "GNU C" feature to the
public headers for existing 32-bit archs, which is generally
undesirable; however, the feature is one which glibc has depended on
for a long time, and thus which any viable alternative compiler is
going to need to provide. 64-bit archs are not affected, nor will
future 32-bit archs be, regardless of whether they are "new" on the
kernel side (e.g. riscv32) or just newly-added (e.g. a new sparc or
xtensa port). the same applies to newly-added ABIs for existing
machine-level archs.
2019-10-28 19:26:52 -04:00
Rich Felker
7352b59d68 remove redundant feature test macro checks in sys/time.h
this header is XSI-shaded itself and thus does not need to limit
specific content to _XOPEN_SOURCE.
2016-11-07 11:49:22 -05:00
Rich Felker
befa5866ee make brace placement in public header struct definitions consistent
placing the opening brace on the same line as the struct keyword/tag
is the style I prefer and seems to be the prevailing practice in more
recent additions.

these changes were generated by the command:

find include/ arch/*/bits -name '*.h' \
-exec sed -i '/^struct [^;{]*$/{N;s/\n/ /;}' {} +

and subsequently checked by hand to ensure that the regex did not pick
up any false positives.
2016-07-03 15:02:25 -04:00
Rich Felker
ad87c2eecf add nonstandard timespec/timeval conversion macros in sys/time.h
these are poorly designed (illogical argument order) and even poorly
implemented (brace issues) on glibc, but unfortunately some software
is using them. we could consider removing them again in the future at
some point if they're documented as deprecated, but for now the
simplest thing to do is just to provide them under _GNU_SOURCE.
2014-02-05 16:34:23 -05:00
rofl0r
8ff810d779 timeradd/timersub: cast result to void to get rid of warnings
previously:
timersub(&now, t, &diff);

warning: value computed is not used [-Wunused-value]
2013-11-23 13:01:53 +01:00
Szabolcs Nagy
31ff797787 fix the prototype of settimeofday to follow the original BSD declaration 2013-05-26 16:01:38 +00:00
rofl0r
7aec71c411 add obsolete futimesat()
this function is obsolete, however it's available as a syscall
and as such qemu userspace emulation tries to forward it to the
host kernel.
2012-12-06 20:27:54 +01:00
Rich Felker
c1a9658bd1 default features: make musl usable without feature test macros
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.
2012-09-07 23:13:55 -04:00
Rich Felker
400c5e5c83 use restrict everywhere it's required by c99 and/or posix 2008
to deal with the fact that the public headers may be used with pre-c99
compilers, __restrict is used in place of restrict, and defined
appropriately for any supported compiler. we also avoid the form
[restrict] since older versions of gcc rejected it due to a bug in the
original c99 standard, and instead use the form *restrict.
2012-09-06 22:44:55 -04:00
Rich Felker
419ae6d5c9 support _BSD_SOURCE feature test macro
patch by Isaac Dunham. matched closely (maybe not exact) to glibc's
idea of what _BSD_SOURCE should make visible.
2012-05-22 21:52:08 -04:00
Rich Felker
477e72ac4a add legacy futimes and lutimes functions
based on patch by sh4rm4. these functions are deprecated; futimens and
utimensat should be used instead in new programs.
2012-01-24 19:50:44 -05:00
Rich Felker
cac7d837cc fix and cleanup suseconds_t/timeval stuff (broken on 64-bit)
trash in the upper 32 bits was making the kernel sleep forever in
select on 64-bit systems.
2011-04-13 13:16:49 -04:00
Rich Felker
691b20bec0 add legacy BSD-style timer*() macros in sys/time.h 2011-04-10 22:46:46 -04:00
Rich Felker
b1b465c438 cleanup namespace in sys/time.h 2011-02-27 03:48:19 -05:00
Rich Felker
74eea628cf extensive header cleanup for standards conformance & correctness
thanks to Peter Mazinger (psm) for pointing many of these issues out
and submitting a patch on which this commit is loosely based
2011-02-14 18:41:25 -05:00
Rich Felker
0b44a0315b initial check-in, version 0.5.0 2011-02-12 00:22:29 -05:00