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329ea513b4
Neither the <dlfcn.h> entry points, nor lazy symbol resolution, nor
initial shared library load-up, are cancellation points, so ld.so
should exclusively use I/O primitives that are not cancellable. We
currently achieve this by having the cancellation hooks compile as
no-ops when IS_IN(rtld); this patch changes to using exclusively
_nocancel primitives in the source code instead, which makes the
intent clearer and significantly reduces the amount of code compiled
under IS_IN(rtld) as well as IS_IN(libc) -- in particular,
elf/Makefile no longer thinks we require a copy of unwind.c in
rtld-libc.a. (The older mechanism is preserved as a backstop.)
The bulk of the change is splitting up the files that define the
_nocancel I/O functions, so they don't also define the variants that
*are* cancellation points; after which, the existing logic for picking
out the bits of libc that need to be recompiled as part of ld.so Just
Works. I did this for all of the _nocancel functions, not just the
ones used by ld.so, for consistency.
fcntl was a little tricky because it's only a cancellation point for
certain opcodes (F_SETLKW(64), which can block), and the existing
__fcntl_nocancel wasn't applying the FCNTL_ADJUST_CMD hook, which
strikes me as asking for trouble, especially as the only nontrivial
definition of FCNTL_ADJUST_CMD (for powerpc64) changes F_*LK* opcodes.
To fix this, fcntl_common moves to fcntl_nocancel.c along with
__fcntl_nocancel, and changes its name to the extern (but hidden)
symbol __fcntl_nocancel_adjusted, so that regular fcntl can continue
calling it. __fcntl_nocancel now applies FCNTL_ADJUST_CMD; so that
both both fcntl.c and fcntl_nocancel.c can see it, the only nontrivial
definition moves from sysdeps/u/s/l/powerpc/powerpc64/fcntl.c to
.../powerpc64/sysdep.h and becomes entirely a macro, instead of a macro
that calls an inline function.
The nptl version of libpthread also changes a little, because its
"compat-routines" formerly included files that defined all the
_nocancel functions it uses; instead of continuing to duplicate them,
I exported the relevant ones from libc.so as GLIBC_PRIVATE. Since the
Linux fcntl.c calls a function defined by fcntl_nocancel.c, it can no
longer be used from libpthread.so; instead, introduce a custom
forwarder, pt-fcntl.c, and export __libc_fcntl from libc.so as
GLIBC_PRIVATE. The nios2-linux ABI doesn't include a copy of vfork()
in libpthread, and it was handling that by manipulating
libpthread-routines in .../linux/nios2/Makefile; it is cleaner to do
what other such ports do, and have a pt-vfork.S that defines no symbols.
Right now, it appears that Hurd does not implement _nocancel I/O, so
sysdeps/generic/not-cancel.h will forward everything back to the
regular functions. This changed the names of some of the functions
that sysdeps/mach/hurd/dl-sysdep.c needs to interpose.
* elf/dl-load.c, elf/dl-misc.c, elf/dl-profile.c, elf/rtld.c
* sysdeps/unix/sysv/linux/dl-sysdep.c
Include not-cancel.h. Use __close_nocancel instead of __close,
__open64_nocancel instead of __open, __read_nocancel instead of
__libc_read, and __write_nocancel instead of __libc_write.
* csu/check_fds.c (check_one_fd)
* sysdeps/posix/fdopendir.c (__fdopendir)
* sysdeps/posix/opendir.c (__alloc_dir): Use __fcntl_nocancel
instead of __fcntl and/or __libc_fcntl.
* sysdeps/unix/sysv/linux/pthread_setname.c (pthread_setname_np)
* sysdeps/unix/sysv/linux/pthread_getname.c (pthread_getname_np)
* sysdeps/unix/sysv/linux/i386/smp.h (is_smp_system):
Use __open64_nocancel instead of __open_nocancel.
* sysdeps/unix/sysv/linux/not-cancel.h: Move all of the
hidden_proto declarations to the end and issue them if either
IS_IN(libc) or IS_IN(rtld).
* sysdeps/unix/sysv/linux/Makefile [subdir=io] (sysdep_routines):
Add close_nocancel, fcntl_nocancel, nanosleep_nocancel,
open_nocancel, open64_nocancel, openat_nocancel, pause_nocancel,
read_nocancel, waitpid_nocancel, write_nocancel.
* io/Versions [GLIBC_PRIVATE]: Add __libc_fcntl,
__fcntl_nocancel, __open64_nocancel, __write_nocancel.
* posix/Versions: Add __nanosleep_nocancel, __pause_nocancel.
* nptl/pt-fcntl.c: New file.
* nptl/Makefile (pthread-compat-wrappers): Remove fcntl.
(libpthread-routines): Add pt-fcntl.
* include/fcntl.h (__fcntl_nocancel_adjusted): New function.
(__libc_fcntl): Remove attribute_hidden.
* sysdeps/unix/sysv/linux/fcntl.c (__libc_fcntl): Call
__fcntl_nocancel_adjusted, not fcntl_common.
(__fcntl_nocancel): Move to new file fcntl_nocancel.c.
(fcntl_common): Rename to __fcntl_nocancel_adjusted; also move
to fcntl_nocancel.c.
* sysdeps/unix/sysv/linux/fcntl_nocancel.c: New file.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/fcntl.c: Remove file.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep.h:
Define FCNTL_ADJUST_CMD here, as a self-contained macro.
* sysdeps/unix/sysv/linux/close.c: Move __close_nocancel to...
* sysdeps/unix/sysv/linux/close_nocancel.c: ...this new file.
* sysdeps/unix/sysv/linux/nanosleep.c: Move __nanosleep_nocancel to...
* sysdeps/unix/sysv/linux/nanosleep_nocancel.c: ...this new file.
* sysdeps/unix/sysv/linux/open.c: Move __open_nocancel to...
* sysdeps/unix/sysv/linux/open_nocancel.c: ...this new file.
* sysdeps/unix/sysv/linux/open64.c: Move __open64_nocancel to...
* sysdeps/unix/sysv/linux/open64_nocancel.c: ...this new file.
* sysdeps/unix/sysv/linux/openat.c: Move __openat_nocancel to...
* sysdeps/unix/sysv/linux/openat_nocancel.c: ...this new file.
* sysdeps/unix/sysv/linux/openat64.c: Move __openat64_nocancel to...
* sysdeps/unix/sysv/linux/openat64_nocancel.c: ...this new file.
* sysdeps/unix/sysv/linux/pause.c: Move __pause_nocancel to...
* sysdeps/unix/sysv/linux/pause_nocancel.c: ...this new file.
* sysdeps/unix/sysv/linux/read.c: Move __read_nocancel to...
* sysdeps/unix/sysv/linux/read_nocancel.c: ...this new file.
* sysdeps/unix/sysv/linux/waitpid.c: Move __waitpid_nocancel to...
* sysdeps/unix/sysv/linux/waitpid_nocancel.c: ...this new file.
* sysdeps/unix/sysv/linux/write.c: Move __write_nocancel to...
* sysdeps/unix/sysv/linux/write_nocancel.c: ...this new file.
* sysdeps/unix/sysv/linux/nios2/Makefile: Don't override
libpthread-routines.
* sysdeps/unix/sysv/linux/nios2/pt-vfork.S: New file which
defines nothing.
* sysdeps/mach/hurd/dl-sysdep.c: Define __read instead of
__libc_read, and __write instead of __libc_write. Define
__open64 in addition to __open.
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|---|---|---|
| .. | ||
| bits | ||
| sys | ||
| access.c | ||
| bug-ftw1.c | ||
| bug-ftw2.c | ||
| bug-ftw3.c | ||
| bug-ftw4.c | ||
| bug-ftw5.c | ||
| chdir.c | ||
| chmod.c | ||
| chown.c | ||
| close.c | ||
| copy_file_range-compat.c | ||
| copy_file_range.c | ||
| creat64.c | ||
| creat.c | ||
| dup2.c | ||
| dup3.c | ||
| dup.c | ||
| euidaccess.c | ||
| faccessat.c | ||
| fchdir.c | ||
| fchmod.c | ||
| fchmodat.c | ||
| fchown.c | ||
| fchownat.c | ||
| fcntl.c | ||
| fcntl.h | ||
| flock.c | ||
| fstat64.c | ||
| fstat.c | ||
| fstatat64.c | ||
| fstatat.c | ||
| fstatfs64.c | ||
| fstatfs.c | ||
| fstatvfs64.c | ||
| fstatvfs.c | ||
| fts64.c | ||
| fts.c | ||
| fts.h | ||
| ftw64.c | ||
| ftw.c | ||
| ftw.h | ||
| ftwtest-sh | ||
| ftwtest.c | ||
| futimens.c | ||
| fxstat64.c | ||
| fxstat.c | ||
| fxstatat64.c | ||
| fxstatat.c | ||
| getcwd.c | ||
| getdirname.c | ||
| getwd.c | ||
| isatty.c | ||
| lchmod.c | ||
| lchown.c | ||
| link.c | ||
| linkat.c | ||
| lockf64.c | ||
| lockf.c | ||
| lseek64.c | ||
| lseek.c | ||
| lstat64.c | ||
| lstat.c | ||
| lxstat64.c | ||
| lxstat.c | ||
| Makefile | ||
| mkdir.c | ||
| mkdirat.c | ||
| mkfifo.c | ||
| mkfifoat.c | ||
| mknod.c | ||
| mknodat.c | ||
| open64_2.c | ||
| open64.c | ||
| open_2.c | ||
| open.c | ||
| openat64_2.c | ||
| openat64.c | ||
| openat_2.c | ||
| openat.c | ||
| pipe2.c | ||
| pipe.c | ||
| poll.c | ||
| poll.h | ||
| posix_fadvise64.c | ||
| posix_fadvise.c | ||
| posix_fallocate64.c | ||
| posix_fallocate.c | ||
| ppoll.c | ||
| pwd.c | ||
| read.c | ||
| readlink.c | ||
| readlinkat.c | ||
| rmdir.c | ||
| sendfile64.c | ||
| sendfile.c | ||
| stat64.c | ||
| stat.c | ||
| statfs64.c | ||
| statfs.c | ||
| statvfs64.c | ||
| statvfs.c | ||
| symlink.c | ||
| symlinkat.c | ||
| test-lfs.c | ||
| test-stat2.c | ||
| test-stat.c | ||
| test-utime.c | ||
| tst-copy_file_range-compat.c | ||
| tst-copy_file_range.c | ||
| tst-faccessat.c | ||
| tst-fchmodat.c | ||
| tst-fchownat.c | ||
| tst-fcntl.c | ||
| tst-fstatat.c | ||
| tst-fts-lfs.c | ||
| tst-fts.c | ||
| tst-futimesat.c | ||
| tst-getcwd-abspath.c | ||
| tst-getcwd.c | ||
| tst-linkat.c | ||
| tst-mkdirat.c | ||
| tst-mkfifoat.c | ||
| tst-mknodat.c | ||
| tst-open-tmpfile.c | ||
| tst-openat.c | ||
| tst-posix_fallocate64.c | ||
| tst-posix_fallocate-common.c | ||
| tst-posix_fallocate.c | ||
| tst-readlinkat.c | ||
| tst-renameat.c | ||
| tst-statvfs.c | ||
| tst-symlinkat.c | ||
| tst-ttyname_r.c | ||
| tst-unlinkat.c | ||
| ttyname_r.c | ||
| ttyname.c | ||
| umask.c | ||
| unlink.c | ||
| unlinkat.c | ||
| utime.c | ||
| utime.h | ||
| utimensat.c | ||
| Versions | ||
| write.c | ||
| xmknod.c | ||
| xmknodat.c | ||
| xstat64.c | ||
| xstat.c | ||