n3091 accepts n3066, making it part of the next working draft and C23: https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3091.doc Update timespec.3type appropriately, largely mirroring my paper. Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@xxxxxxxxxxxxxxxxxx> --- This is in many ways a followup to the patchset that originally added the BUGS sexion to timespec.3type, root msgid of <ec1dcc655184f6cdaae40ff8b7970b750434e4ef.1638123425.git.nabijaczleweli@xxxxxxxxxxxxxxxxxx> For ease of reference, n3066: https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3066.pdf and the relevant part of n3091 (screenshot, it's a .doc): https://cohost.org/nabijaczleweli/post/922578-pog-pog 2/3 and 3/3 only span the pages that matched git grep -l tv_nsec, but that should be most of the relevant ones man3type/timespec.3type | 46 +++++++++++++---------------------------- 1 file changed, 14 insertions(+), 32 deletions(-) diff --git a/man3type/timespec.3type b/man3type/timespec.3type index 7cd80ce86..ca5533814 100644 --- a/man3type/timespec.3type +++ b/man3type/timespec.3type @@ -16,14 +16,27 @@ Standard C library .PP .B struct timespec { .BR " time_t tv_sec;" " /* Seconds */" -.BR " long tv_nsec;" " /* Nanoseconds [" 0 ", " 999999999 "] */" +.BR " /*\(da*/ tv_nsec;" " /* Nanoseconds [" 0 ", " 999999999 "] */" .B }; .EE .SH DESCRIPTION Describes times in seconds and nanoseconds. +.PP +.I tv_nsec +is of an implementation-defined signed type capable of holding the specified range. +Under glibc, this is usually +.IR long , +and +.I long long +on X32. +It can safely be down-cast to any concrete 32-bit integer type for processing. .SH STANDARDS C11 and later; POSIX.1-2001 and later. +Prior to C23 +.I tv_nsec +was +.IR long . .SH NOTES The following headers also provide this type: .IR <aio.h> , @@ -33,37 +46,6 @@ The following headers also provide this type: .IR <sys/select.h> , and .IR <sys/stat.h> . -.SH BUGS -Under glibc, -.I tv_nsec -is the -.I syscall -long, -though this affects only fringe architectures like X32, -which is ILP32, but uses the LP64 AMD64 syscall ABI. -In reality, the field ends up being defined as: -.PP -.in +4n -.EX -#if __x86_64__ && __ILP32__ /* == x32 */ - long long tv_nsec; -#else - long tv_nsec; -#endif -.EE -.in -.PP -This is a long-standing and long-enshrined glibc bug -.UR https://sourceware.org/bugzilla/show_bug.cgi?id=16437 -.I #16437 -.UE , -and an incompatible extension to the standards; -however, as even a 32-bit -.I long -can hold the entire -.I tv_nsec -range, -it's always safe to forcibly down-cast it to the standard type. .SH SEE ALSO .BR clock_gettime (2), .BR clock_nanosleep (2), -- 2.30.2
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