#wayland on 2022-12-11 — irc logs at oftc.irclog.whitequark.org

2022-08-14 19:47 ChanServ changed the topic of #wayland to: https://wayland.freedesktop.org | Discussion about the Wayland protocol and its implementations, plus libinput | register your nick to speak

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00:39 <DemiMarie> kennylevinsen: is this a legacy of how libwayland-server was originally just Weston?

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10:59 <smallville7123> is it normal for libwayland to use 32_bit time_t ?

11:06 <smallville7123> specifically for this

11:06 <smallville7123> printf("benchmarked %s:\t%ld.%09lds\n",

11:06 <smallville7123> s, elapsed.tv_sec, elapsed.tv_nsec);

11:06 <smallville7123> fixed-benchmark.c

11:06 <smallville7123> format specifies type 'long' but the argument has type 'time_t' (aka 'long long') [-Wformat]

11:23 <smallville7123> welp apparently microsoft doesnt "obey" printf format specifiers o.o https://godbolt.org/z/nfzeaaPT5 'printf' : format string '%ld' requires an argument of type 'long', but variadic argument 2 has type 'time_t'

11:24 <smallville7123> sizeof(time_t) is 8 on both msvc and linuc gcc

11:24 <smallville7123> linux gcc*

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12:42 <smallville7123> welp, apparently it is cus https://stackoverflow.com/a/384672 (and https://stackoverflow.com/a/12023089 )

12:42 <smallville7123> specifically int and long are the same size on windows in both 32 bit and 64 bit

12:43 <smallville7123> "Microsoft uses a different scheme for transitioning to 64-bit: LLP64 ('long long, pointers are 64-bit'). This has the merit of meaning that 32-bit software can be recompiled without change. It has the demerit of being different from what everyone else does, and also requires code to be revised to exploit 64-bit capacities."

12:43 <smallville7123> also "All modern 64-bit Unix systems use LP64. MacOS X and Linux are both modern 64-bit systems."

12:48 <smallville7123> so i will need to refactor libwayland to work with LLP64 data model (which involves transitioning all "long" and related format specs to use "long long" instead

12:49 <emersion> i think we use sized integers when it matters

12:50 <emersion> we shouldn't assume the size of time_t

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12:52 <smallville7123> hmm

12:58 <smallville7123> then at least i will need to adjust the format specifiers to use %lld instead of %ld

12:59 <emersion> i'd suggest sending a patch to cast to int64_t and then use PRIi64

12:59 <smallville7123> since %ld == %lld on LP64 and %ld == %d on LLP64

12:59 <emersion> or 32-bit, not sure whatt's most appropriate

13:00 <smallville7123> tho in that case, time_t itself is target-arch specific

13:00 <smallville7123> eg it could be 32 bits when compiling for 32 bits, and 64 bits when compiling for 64 bits depending if LP64 or LLP64

13:01 <smallville7123> wait no...

13:01 <smallville7123> it would only be the printf format specifiers that assume specific width, right?

13:02 <emersion> %ld is for printing long int

13:02 <emersion> time_t may not be a long int

13:02 <smallville7123> yea

13:02 <emersion> so casting to the larger type would fix it

13:03 <smallville7123> but %ld assumes 4 bits on LLP64 model, right?

13:03 <smallville7123> (as sizeof long == 4)

13:03 <emersion> %ld has no fixed size

13:04 <emersion> (nit, sizeof returns a size in bytes)

13:04 <smallville7123> well it at least gaurentees to print the type of long, however the size of long itself may actually be

13:04 <emersion> sure

13:06 <smallville7123> so if long for LP64 (unix/mac) is 64 bits, but long for LLP64 is 32 bits, then we would need to convert to 64 bits, right?

13:07 <smallville7123> (which on windows, time_t happens to be 64 bits when compiling for 64 bits (_WIN64 and _USE_32_BIT_TIME cannot be specified together) )

13:07 <smallville7123> and long long is always 64 bits on both LP64 and LLP64

13:08 <smallville7123> (again, not sure if libwayland only needs to change printf specifiers or if other code also needs porting to LLP64 64 bit)

13:09 <smallville7123> imma just assume printf specifiers are only thing that needs changing for now :)

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13:11 <emersion> yeah, cast to 64-bit sounds like the thing to do here

13:12 <emersion> alternatively use intmax_t and %jd

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13:17 <smallville7123> however, windows has long tv_nsec for timespec :(

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13:41 <emersion> yeah, so does Linux

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14:20 <smallville7123> ok

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23:59 <tommybomb> Does anyone have a simple wayland + cairo example? Similar to the wayland egl example?