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At the moment when targeting bare-metal targets or systems without
definition for the locking primitives newlib, uses dummy empty macros.
This has the advantage of reduced size and faster implementation but
does not allow the application to retarget the locking routines.
Retargeting is useful for a single toolchain to support multiple systems
since then it's only at link time that you know which system you are
targeting.
This patch adds a new configure option
--enable-newlib-retargetable-locking to use dummy empty functions
instead of dummy empty macros. The default is to keep the current
behavior to not have any size or speed impact on targets not interested
in this feature. To allow for any size of lock, the _LOCK_T type is
changed into pointer to struct _lock and the _init function are tasked
with allocating the locks. The platform being targeted must provide the
static locks. A dummy implementation of the locking routines and static
lock is provided for single-threaded applications to link successfully
out of the box.
To ensure that the behavior is consistent (either no locking whatsoever
or working locking), the dummy implementation is strongly defined such
that a partial retargeting will cause a doubly defined link error.
Indeed, the linker will only pull in the file providing the dummy
implementation if it cannot find an implementation for one of the
routine or lock.
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* libc/include/sys/lock.h: Add void cast to avoid "statement has no
effect" warnings from gcc.
* libc/include/sys/stdio.h: Ditto.
* libc/include/sys/time.h: Correct gettimeofday() prototype.
* libc/stdlib/__exp10.c: Add #include "std.h" for function prototype.
* libc/stdlib/__ten_mu.c: Ditto.
* libc/stdlib/std.h: Correct __exp10's ANSI prototype.
* libc/stdlib/ldtoa.c: Change eiisinf definition to ANSI form. (Are
already others in file without _ansi method, so did not bother.)
* libc/stdlib/system.c: Use _ansi forms for function prototypes and
definitions.
* libc/time/mktime.c: Ditto.
* libc/misc/__dprintf.c: Ditto.
* libc/include/stdio.h: Add function prototypes for _fgetc_r,
_fgetpos_r, _fsetpos_r, _freopen_r, _rewind_r, freopen64, _freopen64_r,
_funopen_r, and _fopencookie_r.
* libc/include/reent.h: Add function prototype for _stat64_r, align
_execve_r prototype with POSIX definition for execve.
* libc/reent/execr.c: Align function prototype with POSIX definition.
* libc/stdio/asniprintf.c: Add #include "local.h".
* libc/stdio/vasniprintf.c: Ditto.
* libc/stdio/fread.c: Remove unused variable newcount.
* libc/stdio/local.h: Add function prototype for __sccl.
* libc/stdio/open_memstream.c: Remove unused variable flags.
* libc/stdio/vfscanf.c: Proper prototyping for ccfn, remove prototype
for __sccl since now in local.h.
* libc/string/memcpy.c: Add #include <string.h> (for real and for
traditional synopsis), remove extraneous stddef.h and limits.h.
* libc/syscalls/sysclose.c: Add #include <unistd.h>.
* libc/syscalls/sysfork.c: Ditto.
* libc/syscalls/sysgetpid.c: Ditto.
* libc/syscalls/sysexecve.c: Add #include <unistd.h>, align function
prototype with POSIX definition.
* libc/syscalls/sysfstat.c: Add #include <sys/stat.h>.
* libc/syscalls/sysgettod.c: Correct sys/times.h to sys/time.h.
* libc/syscalls/syskill.c: Add #include <signal.h>.
* libc/syscalls/syslink.c: Add #include <unistd.h>, fix prototype.
* libc/syscalls/sysunlink.c: Ditto.
* libc/syscalls/sysstat.c: Add #include <sys/stat.h>, fix prototype.
* libc/syscalls/syswait.c: Add #include <sys/wait.h>, fix prototype.
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* libc/include/sys/lock.h: Replaced empty {} with (0) to conform
with locking API.
* libc/include/sys/stdio.h: (_flockfile)[!_SINGLE_THREAD]: Add
check for__SSTR in _flags and if set, skip lock request.
(_funlockfile)[!SINGLE_THREAD]: Ditto.
* libc/stdio/local.h (CHECK_INIT): Added check that _REENT is
not NULL.
* libc/stdio/siprintf.c (siprintf, _siprintf_r): Added missing
initialisation of _file to -1 in local FILE.
* libc/stdio/snprintf.c (snprintf, _snprintf_r): Ditto.
* libc/stdio/sscanf.c (sscanf, _sscanf_r): Ditto.
* libc/stdio/vsnprintf.c (vsnprintf, _vsnprintf_r): Ditto.
* libc/stdio/vsscanf.c (_vsscanf_r): Ditto.
* libc/stdio/sscanf.c (sscanf, _sscanf_r): Added __SSTR flag to
_flags in local FILE to prevent locking.
* libc/stdio/vsscanf.c (_vsscanf_r): Ditto.
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* libc/include/sys/_types.h (_flock_t): Added.
* libc/include/sys/lock.h (__lock_try_acquire): New interface.
(__lock_try_acquire_recursive): Ditto.
* libc/include/sys/reent.h (__sFILE, __sFILE64): Add new
_lock field.
* libc/stdio/findfp.c (std)[!__SINGLE_THREAD__]: Initialize _lock
field.
* libc/stdio/fopen.c (_fopen_r)[!__SINGLE_THREAD__]: Ditto.
* libc/stdio64/fopen64.c (_fopen64_r)[!__SINGLE_THREAD__]: Ditto.
* libc/sys/linux/include/time.h (struct timespec): Moved from
<sys/types.h> and added check for __need_timespec flag so type
can be defined by itself.
* libc/sys/linux/sys/_types.h (_flock_t): New type.
* libc/sys/linux/sys/types.h (struct timespec): Moved to
<time.h>.
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* libc/include/string.h[__linux__]: Add strsignal prototype.
* libc/include/sys/lock.h: New file with default locking support.
* libc/include/sys/reent.h: Add signal buffer support for strsignal
and psignal.
* libc/posix/Makefile.am: Add support for readdir_r.c.
* libc/posix/Makefile.in: Regenerated.
* libc/posix/closedir.c: Add locking support and hash table cleanup.
* libc/posix/opendir.c: Add lock support.
* libc/posix/readdir.c: Ditto.
* libc/posix/rewinddir.c: Ditto.
* libc/posix/scandir.c: Ditto.
* libc/posix/seekdir.c: Ditto.
* libc/posix/telldir.c: Ditto plus add _cleanupdir routine to
clean up leftover hash table entries.
* libc/posix/readdir_r.c: New file.
* libc/sys/linux/Makefile.am: Add psignal.c and strsignal.c support.
* libc/sys/linux/Makefile.in: Regenerated.
* libc/sys/linux/sys/dirent.h: Add dd_lock to DIR structure.
* libc/sys/linux/sys/signal.h: Add psignal prototype.
* libc/sys/linux/psignal.c: New file.
* libc/sys/linux/strsignal.c: Ditto.
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