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_IO_MTSAFE_IO controls whether stdio is *built* with support for
multithreading. In the distant past it might also have worked as a
feature selection macro, allowing library *users* to select
thread-safe or lock-free stdio at application build time, I haven't
done the archaeology. Nowadays, defining _IO_MTSAFE_IO while using
the installed headers, or in _ISOMAC mode, will cause libio.h to throw
syntax errors.
This patch removes _IO_MTSAFE_IO from the public headers
(specifically, from libio/libio.h). The most important thing it
controlled in there was whether libio.h defines _IO_lock_t itself or
expects stdio-lock.h to have done it, and we do still need a
inter-header communication macro for that, because stdio-lock.h can
only define _IO_lock_t as a typedef. I've invented
_IO_lock_t_defined, which is defined by both versions of stdio-lock.h.
_IO_MTSAFE_IO also controlled the definitions of a handful of macros
that _might_ count as part of the public libio.h interface. They are
now unconditionally given their non-_IO_MTSAFE_IO definition in
libio/libio.h, and include/libio.h redefines them with the
_IO_MTSAFE_IO definition. This should minimize the odds of breaking
old software that actually uses those macros.
I suspect that this entire mechanism is vestigial, and that glibc
won't build anymore if you *don't* define _IO_MTSAFE_IO, but that's
another patchset. The bulk of libio.h is internal-use-only stuff that
no longer makes sense to expose (libstdc++ gave up on making a FILE
the same object as a C++ filebuf *decades* ago) but that, too, is
another patchset.
* libio/libio.h: Condition dummy definition of _IO_lock_t on
_IO_lock_t_defined, not _IO_MTSAFE_IO. Unconditionally use the
non-_IO_MTSAFE_IO definitions for _IO_peekc, _IO_flockfile,
_IO_funlockfile, and _IO_ftrylockfile. Only define
_IO_cleanup_region_start and _IO_cleanup_region_end if not
already defined.
* include/libio.h: If _IO_MTSAFE_IO is defined, redefine
_IO_peekc, _IO_flockfile, _IO_funlockfile, and _IO_ftrylockfile
appropriately.
* sysdeps/generic/stdio-lock.h, sysdeps/nptl/stdio-lock.h:
Define _IO_lock_t_defined after defining _IO_lock_t.
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It was noted in
<https://sourceware.org/ml/libc-alpha/2012-09/msg00305.html> that the
bits/*.h naming scheme should only be used for installed headers.
This patch renames bits/libc-lock.h to plain libc-lock.h and
bits/libc-lockP.h to plain libc-lockP.h to follow that convention.
Note that I don't know where libc-lockP.h comes from for Hurd (the
Hurd libc-lock.h includes libc-lockP.h, but the only libc-lockP.h in
the glibc source tree is for NPTL) - some unmerged patch? - but I
updated the #include in the Hurd libc-lock.h anyway.
Tested for x86_64 (testsuite, and that installed stripped shared
libraries are unchanged by the patch).
[BZ #14912]
* bits/libc-lock.h: Move to ...
* sysdeps/generic/libc-lock.h: ...here.
(_BITS_LIBC_LOCK_H): Rename macro to _LIBC_LOCK_H.
* sysdeps/mach/hurd/bits/libc-lock.h: Move to ...
* sysdeps/mach/hurd/libc-lock.h: ...here.
(_BITS_LIBC_LOCK_H): Rename macro to _LIBC_LOCK_H.
[_LIBC]: Include <libc-lockP.h> instead of <bits/libc-lockP.h>.
* sysdeps/mach/bits/libc-lock.h: Move to ...
* sysdeps/mach/libc-lock.h: ...here.
(_BITS_LIBC_LOCK_H): Rename macro to _LIBC_LOCK_H.
* sysdeps/nptl/bits/libc-lock.h: Move to ...
* sysdeps/nptl/libc-lock.h: ...here.
(_BITS_LIBC_LOCK_H): Rename macro to _LIBC_LOCK_H.
* sysdeps/nptl/bits/libc-lockP.h: Move to ...
* sysdeps/nptl/libc-lockP.h: ...here.
(_BITS_LIBC_LOCKP_H): Rename macro to _LIBC_LOCKP_H.
* crypt/crypt_util.c: Include <libc-lock.h> instead of
<bits/libc-lock.h>.
* dirent/scandir-tail.c: Likewise.
* dlfcn/dlerror.c: Likewise.
* elf/dl-close.c: Likewise.
* elf/dl-iteratephdr.c: Likewise.
* elf/dl-lookup.c: Likewise.
* elf/dl-open.c: Likewise.
* elf/dl-support.c: Likewise.
* elf/dl-writev.h: Likewise.
* elf/rtld.c: Likewise.
* grp/fgetgrent.c: Likewise.
* gshadow/fgetsgent.c: Likewise.
* gshadow/sgetsgent.c: Likewise.
* iconv/gconv_conf.c: Likewise.
* iconv/gconv_db.c: Likewise.
* iconv/gconv_dl.c: Likewise.
* iconv/gconv_int.h: Likewise.
* iconv/gconv_trans.c: Likewise.
* include/link.h: Likewise.
* inet/getnameinfo.c: Likewise.
* inet/getnetgrent.c: Likewise.
* inet/getnetgrent_r.c: Likewise.
* intl/bindtextdom.c: Likewise.
* intl/dcigettext.c: Likewise.
* intl/finddomain.c: Likewise.
* intl/gettextP.h: Likewise.
* intl/loadmsgcat.c: Likewise.
* intl/localealias.c: Likewise.
* intl/textdomain.c: Likewise.
* libidn/idn-stub.c: Likewise.
* libio/libioP.h: Likewise.
* locale/duplocale.c: Likewise.
* locale/freelocale.c: Likewise.
* locale/newlocale.c: Likewise.
* locale/setlocale.c: Likewise.
* login/getutent_r.c: Likewise.
* login/getutid_r.c: Likewise.
* login/getutline_r.c: Likewise.
* login/utmp-private.h: Likewise.
* login/utmpname.c: Likewise.
* malloc/mtrace.c: Likewise.
* misc/efgcvt.c: Likewise.
* misc/error.c: Likewise.
* misc/fstab.c: Likewise.
* misc/getpass.c: Likewise.
* misc/mntent.c: Likewise.
* misc/syslog.c: Likewise.
* nis/nis_call.c: Likewise.
* nis/nis_callback.c: Likewise.
* nis/nss-default.c: Likewise.
* nis/nss_compat/compat-grp.c: Likewise.
* nis/nss_compat/compat-initgroups.c: Likewise.
* nis/nss_compat/compat-pwd.c: Likewise.
* nis/nss_compat/compat-spwd.c: Likewise.
* nis/nss_nis/nis-alias.c: Likewise.
* nis/nss_nis/nis-ethers.c: Likewise.
* nis/nss_nis/nis-grp.c: Likewise.
* nis/nss_nis/nis-hosts.c: Likewise.
* nis/nss_nis/nis-network.c: Likewise.
* nis/nss_nis/nis-proto.c: Likewise.
* nis/nss_nis/nis-pwd.c: Likewise.
* nis/nss_nis/nis-rpc.c: Likewise.
* nis/nss_nis/nis-service.c: Likewise.
* nis/nss_nis/nis-spwd.c: Likewise.
* nis/nss_nisplus/nisplus-alias.c: Likewise.
* nis/nss_nisplus/nisplus-ethers.c: Likewise.
* nis/nss_nisplus/nisplus-grp.c: Likewise.
* nis/nss_nisplus/nisplus-hosts.c: Likewise.
* nis/nss_nisplus/nisplus-initgroups.c: Likewise.
* nis/nss_nisplus/nisplus-network.c: Likewise.
* nis/nss_nisplus/nisplus-proto.c: Likewise.
* nis/nss_nisplus/nisplus-pwd.c: Likewise.
* nis/nss_nisplus/nisplus-rpc.c: Likewise.
* nis/nss_nisplus/nisplus-service.c: Likewise.
* nis/nss_nisplus/nisplus-spwd.c: Likewise.
* nis/ypclnt.c: Likewise.
* nptl/libc_pthread_init.c: Likewise.
* nss/getXXbyYY.c: Likewise.
* nss/getXXent.c: Likewise.
* nss/getXXent_r.c: Likewise.
* nss/nss_db/db-XXX.c: Likewise.
* nss/nss_db/db-netgrp.c: Likewise.
* nss/nss_db/nss_db.h: Likewise.
* nss/nss_files/files-XXX.c: Likewise.
* nss/nss_files/files-alias.c: Likewise.
* nss/nsswitch.c: Likewise.
* posix/regex_internal.h: Likewise.
* posix/wordexp.c: Likewise.
* pwd/fgetpwent.c: Likewise.
* resolv/res_hconf.c: Likewise.
* resolv/res_libc.c: Likewise.
* shadow/fgetspent.c: Likewise.
* shadow/lckpwdf.c: Likewise.
* shadow/sgetspent.c: Likewise.
* socket/opensock.c: Likewise.
* stdio-common/reg-modifier.c: Likewise.
* stdio-common/reg-printf.c: Likewise.
* stdio-common/reg-type.c: Likewise.
* stdio-common/vfprintf.c: Likewise.
* stdio-common/vfscanf.c: Likewise.
* stdlib/abort.c: Likewise.
* stdlib/cxa_atexit.c: Likewise.
* stdlib/fmtmsg.c: Likewise.
* stdlib/random.c: Likewise.
* stdlib/setenv.c: Likewise.
* string/strsignal.c: Likewise.
* sunrpc/auth_none.c: Likewise.
* sunrpc/bindrsvprt.c: Likewise.
* sunrpc/create_xid.c: Likewise.
* sunrpc/key_call.c: Likewise.
* sunrpc/rpc_thread.c: Likewise.
* sysdeps/arm/backtrace.c: Likewise.
* sysdeps/generic/ldsodefs.h: Likewise.
* sysdeps/generic/stdio-lock.h: Likewise.
* sysdeps/generic/unwind-dw2-fde.c: Likewise.
* sysdeps/i386/backtrace.c: Likewise.
* sysdeps/ieee754/ldbl-opt/nldbl-compat.c: Likewise.
* sysdeps/m68k/backtrace.c: Likewise.
* sysdeps/mach/hurd/cthreads.c: Likewise.
* sysdeps/mach/hurd/dirstream.h: Likewise.
* sysdeps/mach/hurd/malloc-machine.h: Likewise.
* sysdeps/nptl/malloc-machine.h: Likewise.
* sysdeps/nptl/stdio-lock.h: Likewise.
* sysdeps/posix/dirstream.h: Likewise.
* sysdeps/posix/getaddrinfo.c: Likewise.
* sysdeps/posix/system.c: Likewise.
* sysdeps/pthread/aio_suspend.c: Likewise.
* sysdeps/s390/s390-32/backtrace.c: Likewise.
* sysdeps/s390/s390-64/backtrace.c: Likewise.
* sysdeps/unix/sysv/linux/check_pf.c: Likewise.
* sysdeps/unix/sysv/linux/if_index.c: Likewise.
* sysdeps/unix/sysv/linux/s390/s390-32/getutent_r.c: Likewise.
* sysdeps/unix/sysv/linux/s390/s390-32/getutid_r.c: Likewise.
* sysdeps/unix/sysv/linux/s390/s390-32/getutline_r.c: Likewise.
* sysdeps/unix/sysv/linux/shm-directory.c: Likewise.
* sysdeps/unix/sysv/linux/system.c: Likewise.
* sysdeps/x86_64/backtrace.c: Likewise.
* time/alt_digit.c: Likewise.
* time/era.c: Likewise.
* time/tzset.c: Likewise.
* wcsmbs/wcsmbsload.c: Likewise.
* nptl/tst-initializers1.c (do_test): Refer to <libc-lock.h>
instead of <bits/libc-lock.h> in comment.
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