_mcount() stub when profiling is enabled. Emit this code sequence
for assembly routines as welli (MCOUNT definition in <machine/asm.h>.
We do not pass the GOT entry however as the 4th argument, because it's
not used. The _mcount() stub calls __mcount(), which does the actual
work. Define _MCOUNT_DECL to define __mcount. We do not have an
implementation of mcount(), so we define MCOUNT as empty, but have a
weak alias to _mcount() in _mcount.S.
Note that the _mcount() stub in the kernel is slightly different from
the stub in userland. This is because we do not have to worry about
nested routines in the kernel.
64 bit systems, years roughly -2^31 through 2^31 can be represented in
time_t without any trouble. 32 bit time_t systems only range from
roughly 1902 through 2038. As a consequence, none of the date munging
code for all the various calendar tweaks before then is present. There
are other problems including the fact that there was no 'year zero' and
so on. So rather than get excited about trying to figure out when the
calendar jumped by two weeks etc, simply disallow negative (ie: prior to
1900) years.
This happens to have an important side effect. If you bzero a 'struct
tm', it corresponds to 'Jan 0, 1900, 00:00 GMT'. This happens to be
representable (after canonification) in 64 bit time_t space. Zero tm
structs are generally an error and mktime normally returns -1 for them.
Interestingly, it tries to canonify the 'jan 0' to 'dec 31, 1899', ie:
year -1. This conveniently trips the negative year test above, which
means we can trivially detect the null 'tm' struct.
This actually tripped up code at work. :-/ (Don't ask)
GP register, because it's clobbered for calls across load modules. The
previous commit inserted the call to _init_tls() between the call to
atexit() and the restoration of the GP register clobbered by it. Fix:
restore GP before we call _init_tls().
Pointy hat: dfr@
19 column positions wide in the first line and 20 in the rest of the lines.
This fixes the example to provide the correct output.
PR: 53454
Noticed by: Kuang-che Wu <kcwu@kcwu.homeip.net>
Submitted by: Marc Silver <marcs@draenor.org>
Approved by: re (scottl)
simple errx() function.
Improve behavior when bzlib/zlib are missing by detecting and
issuing an error message on attempts to read gzip/bzip2 compressed
archives.
a knob to force process scope threads. If the environment variable
LIBPTHREAD_PROCESS_SCOPE is set, force all threads to be process
scope threads regardless of how the application creates them. If
LIBPTHREAD_SYSTEM_SCOPE is set (forcing system scope threads), it
overrides LIBPTHREAD_PROCESS_SCOPE.
$ # To force system scope threads
$ LIBPTHREAD_SYSTEM_SCOPE=anything threaded_app
$ # To force process scope threads
$ LIBPTHREAD_PROCESS_SCOPE=anything threaded_app
