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Adhemerval Zanella 9d7c5cc38e linux: Normalize and return timeout on select (BZ #27651) 
The commit 2433d39b69, which added time64 support to select, changed
the function to use __NR_pselect6 (or __NR_pelect6_time64) on all
architectures.  However, on architectures where the symbol was
implemented with __NR_select the kernel normalizes the passed timeout
instead of return EINVAL.  For instance, the input timeval
{ 0, 5000000 } is interpreted as { 5, 0 }.

And as indicated by BZ #27651, this semantic seems to be expected
and changing it results in some performance issues (most likely
the program does not check the return code and keeps issuing
select with unormalized tv_usec argument).

To avoid a different semantic depending whether which syscall the
architecture used to issue, select now always normalize the timeout
input.  This is a slight change for some ABIs (for instance aarch64).

Checked on x86_64-linux-gnu and i686-linux-gnu.
2021-04-12 18:38:37 -03:00
..
bits Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
sys misc: Sync cdefs.h with gnulib 2021-02-09 16:57:52 -03:00
acct.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
allocate_once.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
ar.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
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bug-hsearch1.c .. 2009-01-23 20:41:36 +00:00
chflags.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
chroot.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
daemon.c Remove internal usage of extensible stat functions 2020-09-11 14:35:32 -03:00
dirname.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
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fstab.h Remove pre-ISO C support 2012-01-07 23:57:22 -05:00
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getsysstats.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
getttyent.c Fix -Os getc_unlocked linknamespace, localplt issues (bug 15105, bug 19463). 2018-02-21 18:01:11 +00:00
getusershell.c Remove internal usage of extensible stat functions 2020-09-11 14:35:32 -03:00
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gtty.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
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Makefile tst: Provide test for select 2021-03-23 12:23:33 +01:00
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mntent_r.c mntent: Use __putc_unlocked instead of fputc_unlocked 2021-01-08 21:02:12 +05:30
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sbrk.c Use hidden visibility for early static PIE code 2021-01-21 15:55:01 +00:00
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select.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
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stab.h Update. 1997-06-21 02:59:26 +00:00
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syscall.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
syscall.h update from main archive 960107 1997-01-07 23:29:44 +00:00
sysexits.h Update. 1999-06-09 13:08:30 +00:00
syslog.c Correct locking and cancellation cleanup in syslog functions (bug 26100) 2020-08-18 11:27:03 +02:00
syslog.h initial import 1995-02-18 01:27:10 +00:00
truncate64.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
truncate.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
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tst-efgcvt-template.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-empty.c Move all tests out of the csu subdirectory 2016-12-21 11:52:19 +01:00
tst-error1.c Split DIAG_* macros to new header libc-diag.h. 2017-02-25 09:59:46 -05:00
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tst-gethostid.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-hsearch.c Modify several tests to use test-skeleton.c 2014-11-05 15:24:08 +05:30
tst-insremque.c [BZ #2766] 2006-06-17 17:01:42 +00:00
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tst-mntent2.c Fix warning in misc/tst-mntent2.c. 2014-12-16 10:27:16 +01:00
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tst-mntent.c getmntent: fix memory corruption w/blank lines [BZ #18887] 2015-08-29 18:07:00 -04:00
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tst-pselect.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-select.c linux: Normalize and return timeout on select (BZ #27651) 2021-04-12 18:38:37 -03:00
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ttyent.h Remove pre-ISO C support 2012-01-07 23:57:22 -05:00
ttyslot.c As a minor cleanup remove the (r)index defines from include/string.h as 2017-02-06 18:15:18 +00:00
ualarm.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
unwind-link.c Implement <unwind-link.h> for dynamically loading the libgcc_s unwinder 2021-03-01 15:58:01 +01:00
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Versions Implement <unwind-link.h> for dynamically loading the libgcc_s unwinder 2021-03-01 15:58:01 +01:00
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