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* add time64 symbol name redirects to public headers, under arch controlRich Felker2019-10-281-0/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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.
* make brace placement in public header typedef'd structs consistentRich Felker2016-07-031-2/+1
| | | | | | commit befa5866ee30d09c0c96e88af2eabff5911342ea performed this change for struct definitions that did not also involve typedef, but omitted the latter.
* add NFDBITS in sys/select.h with appropriate feature testsRich Felker2013-07-061-0/+3
| | | | | | | the main use for this macro seems to be knowing the correct allocation granularity for dynamic-sized fd_set objects. such usage is non-conforming and results in undefined behavior, but it is widespread in applications.
* remove all remaining redundant __restrict/__inline/_Noreturn defsRich Felker2012-09-081-5/+1
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* use restrict everywhere it's required by c99 and/or posix 2008Rich Felker2012-09-061-2/+8
| | | | | | | | 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.
* FD_ISSET must return an int. this is the easiest way.Rich Felker2011-09-231-1/+1
| | | | | | | | | casting to int would not be correct because high bits could be lost. mapping the high bits down onto low bits would be costlier in the common case where the result is just used in a conditional. changing the type of the bit array elements to int would permute the order of the bit array on 64-bit big endian systems, so that's not an option either.
* fix broken FD_* macros on 64-bit targetsRich Felker2011-08-271-3/+3
| | | | | 1 is too small if int is 32-bit but unsigned long is 64-bit. be explicit and use 1UL.
* add useless type fd_mask. it's in the reserved namespace.Rich Felker2011-04-141-0/+2
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* fix and cleanup suseconds_t/timeval stuff (broken on 64-bit)Rich Felker2011-04-131-0/+1
| | | | | trash in the upper 32 bits was making the kernel sleep forever in select on 64-bit systems.
* initial check-in, version 0.5.0 v0.5.0Rich Felker2011-02-121-0/+34