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that might redefine system include files.
(siginterrupt) [!HAVE_SIGINTERRUPT]: New macro.
(my_usleep): Use NULL rather than (void *) 0.
(rpl_nanosleep) [!defined SA_NOCLDSTOP]:
Use siginterrupt to specify that system calls should be interrupted.
(rpl_nanosleep): Move initialization of suspended closer to call of
my_usleep.
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Include stdbool.h.
(rpl_nanosleep): Usee bool for booleans.
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(first_call): Make it private to rpl_nanosleep, and have it
be zero initially as that's a bit faster.
(my_usleep): Round up fractional times instead of truncating them,
as this is the usual meaning for 'sleep'.
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(rpl_nanosleep): Rename from nanosleep.
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Don't use SA_INTERRUPT to decide whether to call sigaction, as
POSIX.1 doesn't require SA_INTERRUPT and some systems
(e.g. Solaris 7) don't define it. Use SA_NOCLDSTOP instead;
it's been part of POSIX.1 since day 1 (in 1988).
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Don't include time.h or sys/time.h here.
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