musl/src/misc/getrusage.c, branch master musl - an implementation of the standard library for Linux-based systems wait4, getrusage: add time64/x32 variant 2019年10月20日T01:29:55+00:00 Rich Felker dalias@aerifal.cx 2019年10月20日T01:29:55+00:00 5850546e9669f793aab61dfc7c4f2c1ff35c4b29 presently the kernel does not actually define time64 versions of these syscalls, and they're not really needed except to represent extreme cpu time usage. however, x32's versions of the syscalls already behave as time64 ones, meaning the functions were broken on x32 if the caller used any part of the rusage result other than ru_utime and ru_stime. commit 7e8171143124f7f510db555dc6f6327a965a3e84 made it possible to fix this by treating x32's syscalls as time64 versions. in the non-time64-syscall case, make the syscall with the rusage destination pointer adjusted so that all members but the timevals line up between the libc and kernel structures. on 64-bit archs, or present 32-bit archs with 32-bit time_t, the timevals will line up too and no further work is needed. for future 32-bit archs with 64-bit time_t, the timevals are copied into place, contingent on time_t being larger than long. 
presently the kernel does not actually define time64 versions of these
syscalls, and they're not really needed except to represent extreme
cpu time usage. however, x32's versions of the syscalls already behave
as time64 ones, meaning the functions were broken on x32 if the caller
used any part of the rusage result other than ru_utime and ru_stime.
commit 7e8171143124f7f510db555dc6f6327a965a3e84 made it possible to
fix this by treating x32's syscalls as time64 versions.
in the non-time64-syscall case, make the syscall with the rusage
destination pointer adjusted so that all members but the timevals line
up between the libc and kernel structures. on 64-bit archs, or present
32-bit archs with 32-bit time_t, the timevals will line up too and no
further work is needed. for future 32-bit archs with 64-bit time_t,
the timevals are copied into place, contingent on time_t being larger
than long.
include cleanups: remove unused headers and add feature test macros 2013年12月12日T05:09:18+00:00 Szabolcs Nagy nsz@port70.net 2013年12月12日T05:09:18+00:00 571744447c23f91feb6439948f3a619aca850dfb
global cleanup to use the new syscall interface 2011年03月20日T04:16:43+00:00 Rich Felker dalias@aerifal.cx 2011年03月20日T04:16:43+00:00 aa398f56fa398f2202b04e82c67f822f3233786f
initial check-in, version 0.5.0 2011年02月12日T05:22:29+00:00 Rich Felker dalias@aerifal.cx 2011年02月12日T05:22:29+00:00 0b44a0315b47dd8eced9f3b7f31580cf14bbfc01

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