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The close_range () function implements the same API as the Linux and FreeBSD syscalls. It operates atomically and reliably. The specified upper bound is clamped to the actual size of the file descriptor table; it is expected that the most common use case is with last = UINT_MAX. Like in the Linux syscall, it is also possible to pass the CLOSE_RANGE_CLOEXEC flag to mark the file descriptors in the range cloexec instead of acually closing them. Also, add a Hurd version of the closefrom () function. Since unlike on Linux, close_range () cannot fail due to being unuspported by the running kernel, a fallback implementation is never necessary. Signed-off-by: Sergey Bugaev <bugaevc@gmail.com> Message-Id: <20211106153524.82700-1-bugaevc@gmail.com>
228 lines
8.3 KiB
Makefile
228 lines
8.3 KiB
Makefile
# Copyright (C) 1993-2021 Free Software Foundation, Inc.
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# This file is part of the GNU C Library.
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# The GNU C Library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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# The GNU C Library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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# You should have received a copy of the GNU Lesser General Public
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# License along with the GNU C Library; if not, see
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# <https://www.gnu.org/licenses/>.
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ifdef in-Makerules
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# Look for header files in hurd/ under the top-level library source directory.
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# Look for generated header files where they get created.
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includes += -I$(..)hurd -I$(common-objpfx)hurd/
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# We use the style `if (err = call(...))' a lot in the Hurd code,
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# where we have a lot of functions that return zero or an errno code.
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+cflags += -Wno-parentheses
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# Do not use any assembly code from sysdeps/unix (and subdirectories).
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# This bypasses all the system call stubs and uses any existing posix or
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# generic C files instead.
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inhibit-sysdep-asm += unix.*
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inhibit-unix-syscalls = yes
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# Don't try to generate anything from the installed Unix system and its
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# libraries. That is only of use when building for a Unix system, so as to
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# be compatible with some existing binaries for that system.
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inhibit-glue = yes
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ifeq (,$(filter mach hurd,$(subdir)))
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# Subdirectories other than hurd/ might use the generated Hurd headers.
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# So make sure we get a chance to run in hurd/ to make them before all else.
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# (But we don't want to do this in mach/, because hurd/ needs some things
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# there, and we know mach/ doesn't need anything from hurd/.)
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hurd-objpfx = $(common-objpfx)hurd/
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# These are all the generated headers that <hurd.h> includes.
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before-compile += $(patsubst %,$(hurd-objpfx)hurd/%.h,auth io fs process)
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$(patsubst %,$(hurd-objpfx)hurd/%.h,auth io fs process): hurd-before-compile
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.PHONY: hurd-before-compile
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hurd-before-compile: $(common-objpfx)mach/mach-shortcuts.h
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$(MAKE) -C $(..)hurd subdir=hurd before-compile no_deps=t
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endif
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# Hurd profil.c includes this file, so give a rule to make it.
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ifeq ($(subdir),gmon)
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$(common-objpfx)hurd/../mach/RPC_task_get_sampled_pcs.c:
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$(MAKE) -C $(..)mach subdir=mach before-compile no_deps=t
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endif
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# Generate bits/errno.h from the section of the manual that lists all the errno
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# codes.
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errno.texinfo = $(..)manual/errno.texi
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hurd = $(..)sysdeps/mach/hurd
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define mach-errno-h
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($(foreach h,mach/message.h \
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mach/kern_return.h \
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mach/mig_errors.h \
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device/device_types.h,\
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echo '#include <$h>';\
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))
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endef
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# We use the compiler to generate a list of absolute file names for
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# the headers we want to search for Mach error codes, listed above (and
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# incidentally, all other headers those include).
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-include $(common-objpfx)errnos.d
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$(common-objpfx)errnos.d: $(mach-errnos-deps)
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$(mach-errno-h) | \
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$(CC) $(CFLAGS) \
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$(subst -include $(common-objpfx)libc-modules.h,,$(CPPFLAGS)) \
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-M -x c - | \
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sed $(sed-remove-objpfx) -e 's,- *:,mach-errnos-deps :=,' \
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-e 's, \.\./, $(..),g' > $@t
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mv -f $@t $@
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$(hurd)/bits/errno.h: $(common-objpfx)stamp-errnos ;
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$(common-objpfx)stamp-errnos: $(hurd)/errnos.awk $(errno.texinfo) \
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$(mach-errnos-deps) $(common-objpfx)errnos.d
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mkdir -p $(hurd-objpfx)bits
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$(AWK) -f $^ > $(hurd-objpfx)bits/errno.h-tmp
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# Make it unwritable so noone will edit it by mistake.
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-chmod a-w $(hurd-objpfx)bits/errno.h-tmp
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$(move-if-change) $(hurd-objpfx)bits/errno.h-tmp $(hurd)/bits/errno.h
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touch $@
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common-generated += errnos.d stamp-errnos
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# We install the real libc.a as libcrt.a and as libc.a we install a linker
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# script which does -( -lcrt -lmachuser -lhurduser -).
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libc-name = crt
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ifeq (,$(subdir))
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install-others += $(inst_libdir)/libc.a
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$(inst_libdir)/libc.a: $(hurd)/libc-ldscript $(+force); $(do-install)
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ifeq (yes,$(build-profile))
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install-others += $(inst_libdir)/libc_p.a
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$(inst_libdir)/libc_p.a: $(hurd)/libc_p-ldscript $(+force); $(do-install)
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endif
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endif
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# Make sure these are used to build the libc.so shared object too. There
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# is a circular dependency between each of these shared objects and libc
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# (many high-level libc functions call stubs, stubs call low-level libc
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# functions like memcpy and mach_msg). This works out fine at run time
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# (all the objects are loaded before resolving their symbols, so these
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# interdependencies are fine). But to create the shared objects we must
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# link them one at a time; since each needs one or both of the others to
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# produce its DT_NEEDED entries and to assign its undefined symbols the
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# right symbol versions, we can't do any of them before the others! To
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# get around this, we link each lib*user.so shared object twice. First,
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# we link an object without reference to libc.so (since we haven't linked
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# libc.so yet), so it lacks a DT_NEEDED record for the libc soname it
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# depends on, and its undefined symbol references lack the symbol version
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# assignments they should have. We will use this shared object solely to
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# link libc.so against it; that gives libc.so the proper DT_NEEDED record,
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# and symbol versions assignments (if the lib*user.so object is using them).
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# Finally we link a second version of the same lib*user.so shared object,
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# this time linked normally against libc so it gets a proper DT_NEEDED
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# record and symbol version set; this one can be installed for run-time use.
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rpcuserlibs := $(common-objpfx)mach/libmachuser.so \
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$(common-objpfx)hurd/libhurduser.so
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link-rpcuserlibs := $(rpcuserlibs:%user.so=%user-link.so)
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$(common-objpfx)libc.so: $(link-rpcuserlibs)
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$(common-objpfx)linkobj/libc.so: $(link-rpcuserlibs)
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rpath-dirs += mach hurd
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# Make sure the `lib' pass builds the dummy shared objects so
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# we can link libc against them.
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ifeq (mach,$(subdir))
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lib-noranlib: $(common-objpfx)mach/libmachuser-link.so
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endif
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ifeq (hurd,$(subdir))
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lib-noranlib: $(common-objpfx)hurd/libhurduser-link.so
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endif
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$(link-rpcuserlibs): %-link.so: %_pic.a
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# These shared objects are just for the purpose of linking libc,
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# so they don't need abi-note.o linked into them.
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$(build-shlib-helper) \
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-nostdlib -o $@ \
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-Wl,-soname=$(*F).so$($(*F).so-version) \
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$(build-shlib-objlist)
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libmachuser-link.so-no-z-defs = yes
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libhurduser-link.so-no-z-defs = yes
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# And get them into the libc.so ldscript.
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$(inst_libdir)/libc.so: $(rpcuserlibs)
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# The RPC stubs from these libraries are needed in building the dynamic
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# linker, too. It must be self-contained, so we link the needed PIC
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# objects directly into the shared object.
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ifeq (elf,$(subdir))
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$(objpfx)librtld.map: $(rpcuserlibs:.so=_pic.a)
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CFLAGS-dl-load.c = -DEXTERNAL_MAP_FROM_FD
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endif
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# Override the generic Makeconfig values so we link against the RPC libs.
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link-libc-static := -Wl,--start-group \
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$(patsubst %,$(common-objpfx)%.a,\
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libc mach/libmachuser hurd/libhurduser) \
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$(static-gnulib) -Wl,--end-group
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link-libc-static-tests := -Wl,--start-group \
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$(patsubst %,$(common-objpfx)%.a,\
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libc mach/libmachuser hurd/libhurduser) \
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$(static-gnulib-tests) -Wl,--end-group
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ifeq ($(subdir),csu)
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extra-objs += static-start.o
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# We need special startup code for statically linked binaries.
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$(objpfx)crt0.o: $(objpfx)static-start.o $(objpfx)abi-note.o $(objpfx)init.o
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$(link-relocatable)
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endif
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ifeq (hurd, $(subdir))
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sysdep_routines += cthreads
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endif
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ifeq (io, $(subdir))
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sysdep_routines += f_setlk close_nocancel close_nocancel_nostatus close_range \
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fcntl_nocancel open_nocancel openat_nocancel read_nocancel \
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pread64_nocancel write_nocancel pwrite64_nocancel \
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wait4_nocancel \
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xstat fxstat lxstat xstat64 fxstat64 lxstat64 \
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xmknod xmknodat \
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fxstatat fxstatat64
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endif
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ifeq (misc, $(subdir))
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sysdep_routines += writev_nocancel writev_nocancel_nostatus mremap
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endif
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ifeq ($(subdir),sunrpc)
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sysdep_headers += nfs/nfs.h
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endif
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ifeq ($(subdir),socket)
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sysdep_headers += net/ethernet.h net/if_arp.h net/if_ether.h net/route.h
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endif
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ifeq ($(subdir),nis)
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CFLAGS-ypclnt.c += -DUSE_BINDINGDIR=1
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endif
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LDLIBS-pthread.so += $(objdir)/hurd/libhurduser.so
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LDLIBS-c_malloc_debug.so += $(link-rpcuserlibs)
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endif # in-Makerules
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