glibc/sysdeps
Joseph Myers 809fdf0d23 Remove __ASSUME_ATFCTS conditionals in sysdeps/unix/sysv/linux/.
This patch cleans up for __ASSUME_ATFCTS now always being true for the
supported Linux kernel versions by removing conditional code in
sysdeps/unix/sysv/linux.  Several fchownat.c files that were only
present because of differences in the fallback syscalls used
(depending on the architecture-specific names of chown-related
syscalls for 32-bit uids) are removed.  Files that looks like they
could be replaced by syscalls.list entries have the standard "Consider
moving to syscalls.list." comment (see bug 14138) added.  Conditionals
on the relevant __NR_* syscall numbers being defined are also removed,
since my analysis indicated that the relevant syscalls are always
defined for all relevant kernel versions using any affected file.
Much of the removed fallback code had unbounded stack allocations, so
this reduces the number of cases to consider for anyone reviewing uses
of alloca and VLAs in glibc.

There remain tests of __ASSUME_ATFCTS in io/openat.c (to determine
whether to define __have_atfcts) and sysdeps/posix/getcwd.c (which
also uses __have_atfcts); thus, the definition of __ASSUME_ATFCTS
remains in kernel-features.h.  The logical condition relevant there is
whether openat64_not_cancel_3 is known to work.  Hurd doesn't use this
version of getcwd at all, so the conditionals in getcwd.c are always
true in glibc.  However, this code is also used in gnulib.  So the
best way to deal with the conditionals there may be for gnulib people
to deal with merging all relevant changes in both directions between
the glibc and gnulib versions of this file, at the end of which the
openat conditionals should be in whatever form is best for gnulib, and
hardcoded in the _LIBC case to having openat supported.

Tested by comparing before-and-after disassembly of installed
(stripped) shared libraries, on x86_64 and x86.  On x86 the patch made
no change to the disassembly; on x86_64, the only changes were in
readlinkat, where formerly the return value from the readlinkat
syscall was stored in an int variable before being converted to
ssize_t for the return, and now the return value is returned directly
without truncation to int.  I think it's clearly correct not to
truncate the return value (although I also think the truncation would
not have been a user-visible bug because the kernel would never have
returned a value it could have affected).

	* include/fcntl.h (__atfct_seterrno): Remove prototype.
	(__atfct_seterrno_2): Likewise.
	* sysdeps/unix/sysv/linux/alpha/dl-fxstatat64.c: Do not include
	<kernel-features.h>.
	(__ASSUME_ATFCTS): Do not undefine and redefine.
	* sysdeps/unix/sysv/linux/alpha/fxstatat.c [__ASSUME_ATFCTS]
	(__have_atfcts): Remove conditional definition.
	(__fxstatat([__NR_fstatat64]: Make code unconditional.
	(__fxstatat) [!__ASSUME_ATFCTS]: Remove conditional code and code
	unreachable if [__ASSUME_ATFCTS].
	* sysdeps/unix/sysv/linux/dl-fxstatat64.c (__ASSUME_ATFCTS): Do
	not undefine and redefine.
	* sysdeps/unix/sysv/linux/faccessat.c: Do not include
	<kernel-features.h>.
	(faccessat) [__NR_faccessat]: Make code unconditional.
	(faccessat) [!__ASSUME_ATFCTS]: Remove conditional code.
	* sysdeps/unix/sysv/linux/fchmodat.c: Do not include
	<kernel-features.h>.
	(fchmodat) [__NR_fchmodat]: Make code unconditional.
	(fchmodat) [!__ASSUME_ATFCTS]: Remove conditional code.
	* sysdeps/unix/sysv/linux/fchownat.c: Do not include
	<kernel-features.h>.
	(fchownat) [__NR_fchownat]: Make code unconditional.
	(fchownat) [!__ASSUME_ATFCTS]: Remove conditional code.
	* sysdeps/unix/sysv/linux/futimesat.c: Do not include
	<kernel-features.h>.
	(futimesat) [__NR_futimesat]: Make code unconditional.
	(futimesat) [!__ASSUME_ATFCTS]: Remove conditional code.
	* sysdeps/unix/sysv/linux/fxstatat.c: Do not include
	<kernel-features.h>.
	(__fxstatat) [__NR_newfstatat]: Make code unconditional.
	(__fxstatat) [!__ASSUME_ATFCTS]: Remove conditional code.
	* sysdeps/unix/sysv/linux/fxstatat64.c: Do not include
	<kernel-features.h>.
	(__fxstatat64) [__NR_fstatat64]: Make code unconditional.
	(__fxstatat64) [!__ASSUME_ATFCTS]: Remove conditional code.
	* sysdeps/unix/sysv/linux/i386/fchownat.c: Remove file.
	* sysdeps/unix/sysv/linux/i386/fxstatat.c: Do not include
	<kernel-features.h>.
	(__fxstatat) [__NR_fstatat64]: Make code unconditional.
	(__fxstatat) [!__ASSUME_ATFCTS]: Remove conditional code.
	* sysdeps/unix/sysv/linux/linkat.c: Do not include
	<kernel-features.h>.
	(linkat) [__NR_linkat]: Make code unconditional.
	(linkat) [!__ASSUME_ATFCTS]: Remove conditional code.
	* sysdeps/unix/sysv/linux/m68k/fchownat.c: Remove file.
	* sysdeps/unix/sysv/linux/mips/mips64/fxstatat64.c: Do not include
	<kernel-features.h>.
	(__fxstatat64) [__NR_newfstatat]: Make code unconditional.
	(__fxstatat64) [!__ASSUME_ATFCTS]: Remove conditional code.
	* sysdeps/unix/sysv/linux/mkdirat.c: Do not include
	<kernel-features.h>.
	(mkdirat) [__NR_mkdirat]: Make code unconditional.
	(mkdirat) [!__ASSUME_ATFCTS]: Remove conditional code.
	* sysdeps/unix/sysv/linux/openat.c: Do not include
	<kernel-features.h>.
	[!__ASSUME_ATFCTS] (__atfct_seterrno): Remove function.
	[!__ASSUME_ATFCTS] (__have_atfcts): Remove variable.
	(OPENAT_NOT_CANCEL) [__NR_openat]: Make code unconditional.
	(OPENAT_NOT_CANCEL) [!__ASSUME_ATFCTS]: Remove conditional code.
	* sysdeps/unix/sysv/linux/powerpc/fchownat.c: Remove file.
	* sysdeps/unix/sysv/linux/readlinkat.c: Do not include
	<kernel-features.h>.
	(readlinkat) [__NR_readlinkat]: Make code unconditional.
	(readlinkat) [!__ASSUME_ATFCTS]: Remove conditional code.  Return
	result of INLINE_SYSCALL directly, not via int variable.
	* sysdeps/unix/sysv/linux/renameat.c: Do not include
	<kernel-features.h>.
	[!__ASSUME_ATFCTS] (__atfct_seterrno_2): Remove function.
	(renameat) [__NR_renameat]: Make code unconditional.
	(renameat) [!__ASSUME_ATFCTS]: Remove conditional code.
	* sysdeps/unix/sysv/linux/s390/s390-32/fchownat.c: Remove file.
	* sysdeps/unix/sysv/linux/sh/fchownat.c: Remove file.
	* sysdeps/unix/sysv/linux/sparc/sparc32/fchownat.c: Remove file.
	* sysdeps/unix/sysv/linux/sparc/sparc64/dl-fxstatat64.c
	(__ASSUME_ATFCTS): Do not undefine and redefine.
	* sysdeps/unix/sysv/linux/symlinkat.c: Do not include
	<kernel-features.h>.
	(symlinkat) [__NR_symlinkat]: Make code unconditional.
	(symlinkat) [!__ASSUME_ATFCTS]: Remove conditional code.
	* sysdeps/unix/sysv/linux/unlinkat.c: Do not include
	<kernel-features.h>.
	(unlinkat) [__NR_unlinkat]: Make code unconditional.
	(unlinkat) [!__ASSUME_ATFCTS]: Remove conditional code.
	* sysdeps/unix/sysv/linux/wordsize-64/dl-fxstatat64.c
	(__ASSUME_ATFCTS): Do not undefine and redefine.
	* sysdeps/unix/sysv/linux/wordsize-64/fxstatat.c: Do not include
	<kernel-features.h>.
	(__fxstatat) [__NR_newfstatat]: Make code unconditional.
	(__fxstatat) [!__ASSUME_ATFCTS]: Remove conditional code.
	* sysdeps/unix/sysv/linux/xmknodat.c: Do not include
	<kernel-features.h>.
	(__xmknodat) [__NR_mknodat]: Make code unconditional.
	(__xmknodat) [!__ASSUME_ATFCTS]: Remove conditional code.
2014-06-20 15:41:35 +00:00
..
aarch64 [AArch64] Add optimized strchr. 2014-06-19 11:03:59 +01:00
alpha Alpha: Define TLS_DEFINE_INIT_TP 2014-06-11 12:23:35 -07:00
arm Add adaptive elision to rwlocks 2014-06-13 13:15:28 -07:00
generic Add fallback file for elide.h 2014-06-14 09:27:09 -07:00
gnu Silence a missing-noreturn warning for _Unwind_Resume. 2014-05-09 10:06:20 -07:00
hppa HPPA: Define TLS_DEFINE_INIT_TP 2014-06-09 14:04:45 -07:00
i386 [BZ #6803] Set errno for scalbln, scalbn 2014-06-20 07:48:20 +05:30
ia64 [BZ #6803] Set errno for scalbln, scalbn 2014-06-20 07:48:20 +05:30
ieee754 [BZ #6803] Set errno for scalbln, scalbn 2014-06-20 07:48:20 +05:30
init_array Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
m68k [BZ #6803] Set errno for scalbln, scalbn 2014-06-20 07:48:20 +05:30
mach Remove second argument from TLS_INIT_TP macro 2014-05-27 14:48:46 +02:00
microblaze Remove second argument from TLS_INIT_TP macro 2014-05-27 14:48:46 +02:00
mips MIPS: Define TLS_DEFINE_INIT_TP 2014-06-09 13:47:38 -07:00
nptl Add adaptive elision to rwlocks 2014-06-13 13:15:28 -07:00
posix Return EAI_AGAIN for AF_UNSPEC when herrno is TRY_AGAIN (BZ #16849) 2014-05-15 12:33:11 +05:30
powerpc PowerPC: Move powerpc code out of nptl/ subdirectory 2014-06-17 07:54:22 -05:00
pthread Use list.h in posix-timer code. 2014-06-12 14:17:14 -07:00
s390 Use $(rtld-prefix) more consistently. 2014-06-18 10:35:29 +00:00
sh Add adaptive elision to rwlocks 2014-06-13 13:15:28 -07:00
sparc [BZ #6803] Set errno for scalbln, scalbn 2014-06-20 07:48:20 +05:30
tile Add adaptive elision to rwlocks 2014-06-13 13:15:28 -07:00
unix Remove __ASSUME_ATFCTS conditionals in sysdeps/unix/sysv/linux/. 2014-06-20 15:41:35 +00:00
wordsize-32 Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
wordsize-64 Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
x86 Use 3 bytes for __pad1 in pthread_rwlock_t for x32 2014-06-19 15:24:33 -07:00
x86_64 Remove sysdeps/x86_64/multiarch/rtld-strlen.S 2014-06-20 08:10:07 -07:00