Denys Vlasenko [Tue, 10 Feb 2015 17:30:56 +0000 (18:30 +0100)]
x86_64/memset: simple optimizations
"and $0xff,%esi" is a six-byte insn (81 e6 ff 00 00 00), can use
4-byte "movzbl %sil,%esi" (40 0f b6 f6) instead.
64-bit imul is slow, move it as far up as possible so that the result
(rax) has more time to be ready by the time we start using it
in mem stores.
There is no need to shuffle registers in preparation to "rep movs"
if we are not going to take that code path. Thus, patch moves
"jump if len < 16" instructions up, and changes alternate code path
to use rdx and rdi instead of rcx and r8.
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Timo Teräs [Mon, 9 Feb 2015 11:34:41 +0000 (13:34 +0200)]
make protocol table zero byte separated and add ipv6 protocols
Szabolcs Nagy [Mon, 9 Feb 2015 21:53:20 +0000 (22:53 +0100)]
add syscall numbers for the new execveat syscall
this syscall allows fexecve to be implemented without /proc, it is new
in linux v3.19, added in commit
51f39a1f0cea1cacf8c787f652f26dfee9611874
(sh and microblaze do not have allocated syscall numbers yet)
added a x32 fix as well: the io_setup and io_submit syscalls are no
longer common with x86_64, so use the x32 specific numbers.
Szabolcs Nagy [Mon, 9 Feb 2015 21:22:13 +0000 (22:22 +0100)]
add new socket options SO_INCOMING_CPU, SO_ATTACH_BPF, SO_DETACH_BPF
these socket options are new in linux v3.19, introduced in commit
2c8c56e15df3d4c2af3d656e44feb18789f75837 and commit
89aa075832b0da4402acebd698d0411dcc82d03e
with SO_INCOMING_CPU the cpu can be queried on which a socket is
managed inside the kernel and optimize polling of large number of
sockets accordingly.
SO_ATTACH_BPF lets eBPF programs (created by the bpf syscall) to
be attached to sockets.
Szabolcs Nagy [Mon, 9 Feb 2015 21:11:52 +0000 (22:11 +0100)]
use the internal macro name FUTEX_PRIVATE in __wait
the name was recently added for the setxid/synccall rework,
so use the name now that we have it.
Szabolcs Nagy [Mon, 9 Feb 2015 20:38:02 +0000 (21:38 +0100)]
add IEEE binary128 long double support to floatscan
just defining the necessary constants:
LD_B1B_MAX is 2^113 - 1 in base 10^9
KMAX is 2048 so the x array can hold up to 18432 decimal digits
(the worst case is converting 2^-16495 = 5^16495 * 10^-16495 to
binary, it requires the processing of int(log10(5)*16495)+1 = 11530
decimal digits after discarding the leading zeros, the conversion
requires some headroom in x, but KMAX is more than enough for that)
However this code is not optimal on archs with IEEE binary128
long double because the arithmetics is software emulated (on
all such platforms as far as i know) which means big and slow
strtod.
Szabolcs Nagy [Mon, 9 Feb 2015 00:16:35 +0000 (01:16 +0100)]
math: fix fmodl for IEEE binary128
This trivial copy-paste bug went unnoticed due to lack of testing.
No currently supported target archs are affected.
Szabolcs Nagy [Sun, 8 Feb 2015 18:13:09 +0000 (19:13 +0100)]
simplify armhf fesetenv
armhf fesetenv implementation did a useless read of the fpscr.
Szabolcs Nagy [Sun, 8 Feb 2015 17:56:52 +0000 (18:56 +0100)]
fix fesetenv(FE_DFL_ENV) on mips
mips fesetenv did not handle FE_DFL_ENV, now fcsr is cleared in that
case.
Szabolcs Nagy [Sun, 8 Feb 2015 16:41:56 +0000 (17:41 +0100)]
math: fix __fpclassifyl(-0.0) for IEEE binary128
The sign bit was not cleared before checking for 0 so -0.0
was misclassified as FP_SUBNORMAL instead of FP_ZERO.
Szabolcs Nagy [Sun, 8 Feb 2015 16:40:54 +0000 (17:40 +0100)]
add parenthesis in fma.c to clarify intent and silence warnings
Rich Felker [Sat, 7 Feb 2015 19:01:34 +0000 (14:01 -0500)]
make getaddrinfo support SOCK_RAW and other socket types
all socket types are accepted at this point, but that may be changed
at a later time if the behavior is not meaningful for other types. as
before, omitting type (a value of 0) gives both UDP and TCP results,
and SOCK_DGRAM or SOCK_STREAM restricts to UDP or TCP, respectively.
for other socket types, the service name argument is required to be a
null pointer, and the protocol number provided by the caller is used.
Szabolcs Nagy [Sat, 7 Feb 2015 16:25:58 +0000 (17:25 +0100)]
remove cruft from x86_64 syscall.h
x86_64 syscall.h defined some musl internal syscall names and made
them public. These defines were already moved to src/internal/syscall.h
(except for SYS_fadvise which is added now) so the cruft in x86_64
syscall.h is not needed.
Rich Felker [Fri, 6 Feb 2015 04:34:27 +0000 (23:34 -0500)]
fix failure of fchmodat to report EOPNOTSUPP in the race path
in the case where a non-symlink file was replaced by a symlink during
the fchmodat operation with AT_SYMLINK_NOFOLLOW, mode change on the
new symlink target was successfully suppressed, but the error was not
reported. instead, fchmodat simply returned 0.
Rich Felker [Thu, 5 Feb 2015 03:50:40 +0000 (22:50 -0500)]
fix fd leak race (missing O_CLOEXEC) in fchmodat
Rich Felker [Tue, 3 Feb 2015 05:31:35 +0000 (00:31 -0500)]
make execvp continue PATH search on EACCES rather than issuing an errror
the specification for execvp itself is unclear as to whether
encountering a file that cannot be executed due to EACCES during the
PATH search is a mandatory error condition; however, XBD 8.3's
specification of the PATH environment variable clarifies that the
search continues until a file with "appropriate execution permissions"
is found.
since it seems undesirable/erroneous to report ENOENT rather than
EACCES when an early path element has a non-executable file and all
later path elements lack any file by the requested name, the new code
stores a flag indicating that EACCES was seen and sets errno back to
EACCES in this case.
Rich Felker [Tue, 3 Feb 2015 05:16:55 +0000 (00:16 -0500)]
fix missing memory barrier in cancellation signal handler
in practice this was probably a non-issue, because the necessary
barrier almost certainly exists in kernel space -- implementing signal
delivery without such a barrier seems impossible -- but for the sake
of correctness, it should be done here too.
in principle, without a barrier, it is possible that the thread to be
cancelled does not see the store of its cancellation flag performed by
another thread. this affects both the case where the signal arrives
before entering the critical program counter range from __cp_begin to
__cp_end (in which case both the signal handler and the inline check
fail to see the value which was already stored) and the case where the
signal arrives during the critical range (in which case the signal
handler should be responsible for cancellation, but when it does not
see the cancellation flag, it assumes the signal is spurious and
refuses to act on it).
in the fix, the barrier is placed only in the signal handler, not in
the inline check at the beginning of the critical program counter
range. if the signal handler runs before the critical range is
entered, it will of course take no action, but its barrier will ensure
that the inline check subsequently sees the store. if on the other
hand the inline check runs first, it may miss seeing the store, but
the subsequent signal handler in the critical range will act upon the
cancellation request. this strategy avoids adding a memory barrier in
the common, non-cancellation code path.
Felix Janda [Sun, 1 Feb 2015 09:43:37 +0000 (10:43 +0100)]
fix typo in x86_64/x32 user_fpregs_struct
mxcs_mask should be mxcr_mask
Trutz Behn [Wed, 28 Jan 2015 17:46:54 +0000 (18:46 +0100)]
make fsync, fdatasync, and msync cancellation points
these are mandatory cancellation points per POSIX, so their omission
was a conformance bug.
Trutz Behn [Wed, 28 Jan 2015 17:46:52 +0000 (18:46 +0100)]
move MREMAP_MAYMOVE and MREMAP_FIXED out of bits
the definitions are generic for all kernel archs. exposure of these
macros now only occurs on the same feature test as for the function
accepting them, which is believed to be more correct.
Trutz Behn [Wed, 28 Jan 2015 17:46:49 +0000 (18:46 +0100)]
fix missing comma in sh setjmp asm
this typo did not result in an erroneous setjmp with at least binutils
2.22 but fix it for clarity and compatibility with potentially stricter
sh assemblers.
Trutz Behn [Wed, 28 Jan 2015 17:46:46 +0000 (18:46 +0100)]
remove mips-only EINIT and EREMDEV errnos
the errno values are unused by the kernel and the macro definitions were
never exposed by glibc.
Rich Felker [Sat, 31 Jan 2015 02:54:58 +0000 (21:54 -0500)]
fix failure of configure to detect gcc due to message translations
based on patch by Vadim Ushakov. in general overriding LC_ALL rather
than specific categories (here, LC_MESSAGES) is undesirable, but
LC_ALL is easier and in this case there is nothing else that depends
on the locale in this invocation of the compiler.
Rich Felker [Wed, 21 Jan 2015 19:26:05 +0000 (14:26 -0500)]
fix erroneous return of partial username matches by getspnam[_r]
when using /etc/shadow (rather than tcb) as its backend, getspnam_r
matched any username starting with the caller-provided string rather
than requiring an exact match. in practice this seems to have affected
only systems where one valid username is a prefix for another valid
username, and where the longer username appears first in the shadow
file.
Rich Felker [Wed, 21 Jan 2015 18:28:40 +0000 (13:28 -0500)]
simplify part of getopt_long
as a result of commit
e8e4e56a8ce1f3d7e4a027ff5478f2f8ea70c46b,
the later code path for setting optarg to a null pointer is no longer
necessary, and removing it eliminates an indention level and arguably
makes the code more readable.
Rich Felker [Wed, 21 Jan 2015 18:16:15 +0000 (13:16 -0500)]
always set optarg in getopt_long
the standard getopt does not touch optarg unless processing an option
with an argument. however, programs using the GNU getopt API, which we
attempt to provide in getopt_long, expect optarg to be a null pointer
after processing an option without an argument.
before argument permutation support was added, such programs typically
detected its absence and used their own replacement getopt_long,
masking the discrepency in behavior.
Rich Felker [Fri, 16 Jan 2015 04:17:38 +0000 (23:17 -0500)]
overhaul __synccall and fix AS-safety and other issues in set*id
multi-threaded set*id and setrlimit use the internal __synccall
function to work around the kernel's wrongful treatment of these
process properties as thread-local. the old implementation of
__synccall failed to be AS-safe, despite POSIX requiring setuid and
setgid to be AS-safe, and was not rigorous in assuring that all
threads were caught. in a worst case, threads late in the process of
exiting could retain permissions after setuid reported success, in
which case attacks to regain dropped permissions may have been
possible under the right conditions.
the new implementation of __synccall depends on the presence of
/proc/self/task and will fail if it can't be opened, but is able to
determine that it has caught all threads, and does not use any locks
except its own. it thereby achieves AS-safety simply by blocking
signals to preclude re-entry in the same thread.
with this commit, all known conformance and safety issues in set*id
functions should be fixed.
Rich Felker [Fri, 16 Jan 2015 03:51:55 +0000 (22:51 -0500)]
add FUTEX_PRIVATE macro to internal futex.h
Rich Felker [Thu, 15 Jan 2015 12:21:02 +0000 (07:21 -0500)]
suppress EINTR in sem_wait and sem_timedwait
per POSIX, the EINTR condition is an optional error for these
functions, not a mandatory one. since old kernels (pre-2.6.22) failed
to honor SA_RESTART for the futex syscall, it's dangerous to trust
EINTR from the kernel. thankfully POSIX offers an easy way out.
Rich Felker [Thu, 15 Jan 2015 12:09:14 +0000 (07:09 -0500)]
for multithreaded set*id/setrlimit, handle case where callback does not run
in the current version of __synccall, the callback is always run, so
failure to handle this case did not matter. however, the upcoming
overhaul of __synccall will have failure cases, in which case the
callback does not run and errno is already set. the changes being
committed now are in preparation for that.
Rich Felker [Wed, 14 Jan 2015 04:35:08 +0000 (23:35 -0500)]
release 1.1.6
Rich Felker [Tue, 13 Jan 2015 17:04:38 +0000 (12:04 -0500)]
increase syslog message limit from 256 to 1024
this addresses alpine linux issue #3692 and brings the syslog message
length limit in alignment with uclibc's implementation.
Rich Felker [Mon, 12 Jan 2015 23:16:32 +0000 (18:16 -0500)]
remove rlimit hacks from multi-threaded set*id() code
the code being removed was introduced to work around "partial failure"
of multi-threaded set*id() operations, where some threads would
succeed in changing their ids but an RLIMIT_NPROC setting would
prevent the rest from succeeding, leaving the process in an
inconsistent and dangerous state. however, the workaround code did not
handle important usage cases like swapping real and effective uids
then restoring their original values, and the wrongful kernel
enforcement of RLIMIT_NPROC at setuid time was removed in Linux 3.1,
making the workaround obsolete.
since the partial failure still is dangerous on old kernels, and could
in principle happen on post-fix kernels as well if set*id() syscalls
fail for another spurious reason such as resource-related failures,
new code is added to detect and forcibly kill the process if/when such
a situation arises. future documentation releases should be updated to
reflect that setting RLIMIT_NPROC to RLIM_INFINITY is necessary to
avoid this forced-kill on old kernels. ideally, at some point the
kernel will get proper multi-threaded set*id() syscalls capable of
performing their actions atomically, and all of the userspace code to
emulate them can be treated as a fallback for outdated kernels.
Rich Felker [Mon, 12 Jan 2015 05:59:49 +0000 (00:59 -0500)]
simplify ctermid
opening /dev/tty then using ttyname_r on it does not produce a
canonical terminal name; it simply yields "/dev/tty".
it would be possible to make ctermid determine the actual controlling
terminal device via field 7 of /proc/self/stat, but doing so would
introduce a buffer overflow into applications built with L_ctermid==9,
which glibc defines, adversely affecting the quality of ABI compat.
Rich Felker [Sun, 11 Jan 2015 21:32:47 +0000 (16:32 -0500)]
fix regression in getopt_long support for non-option arguments
commit
b72cd07f176b876aa51864d93aa8101477b1d732 added support for a
this feature in getopt, but it was later broken in the case where
getopt_long is used as a side effect of the changes made in commit
91184c4f16b143107fa9935edebe5d2b20bd70d8, which prevented the
underlying getopt call from seeing the leading '-' or '+' character in
optstring.
this commit changes the logic in the getopt_long core to check for a
leading colon, possibly after the leading '-' or '+', without
depending on the latter having been skipped by the caller. a minor
incorrectness in the return value for one error condition in
getopt_long is also fixed when opterr has been set to zero but
optstring has no leading ':'.
Rich Felker [Fri, 9 Jan 2015 05:09:54 +0000 (00:09 -0500)]
check for connect failure in syslog log opening
based on patch by Dima Krasner, with minor improvements for code size.
connect can fail if there is no listening syslogd, in which case a
useless socket was kept open, preventing subsequent syslog call from
attempting to connect again.
Szabolcs Nagy [Tue, 16 Dec 2014 01:37:33 +0000 (02:37 +0100)]
add new prctl command PR_SET_MM_MAP to sys/prctl.h
PR_SET_MM_MAP was introduced as a subcommand for PR_SET_MM in
linux v3.18 commit
f606b77f1a9e362451aca8f81d8f36a3a112139e
the associated struct type is replicated in sys/prctl.h using
libc types.
example usage:
struct prctl_mm_map *p;
...
prctl(PR_SET_MM, PR_SET_MM_MAP, p, sizeof *p);
the kernel side supported struct size may be queried with
the PR_SET_MM_MAP_SIZE subcommand.
Szabolcs Nagy [Mon, 15 Dec 2014 23:20:36 +0000 (00:20 +0100)]
add new syscall numbers for bpf and kexec_file_load
these syscalls are new in linux v3.18, bpf is present on all
supported archs except sh, kexec_file_load is only allocted for
x86_64 and x32 yet.
bpf was added in linux commit
99c55f7d47c0dc6fc64729f37bf435abf43f4c60
kexec_file_load syscall number was allocated in commit
f0895685c7fd8c938c91a9d8a6f7c11f22df58d2
Rich Felker [Sun, 21 Dec 2014 07:43:35 +0000 (02:43 -0500)]
move wint_t definition to the shared part of alltypes.h.in
Rich Felker [Sun, 21 Dec 2014 07:30:29 +0000 (02:30 -0500)]
fix signedness of UINT32_MAX and UINT64_MAX at the preprocessor level
per the rules for hexadecimal integer constants, the previous
definitions were correctly treated as having unsigned type except
possibly when used in preprocessor conditionals, where all artithmetic
takes place as intmax_t or uintmax_t. the explicit 'u' suffix ensures
that they are treated as unsigned in all contexts.
Rich Felker [Sun, 21 Dec 2014 07:10:51 +0000 (02:10 -0500)]
overhaul forkpty function using new login_tty
based on discussion with and patches by Felix Janda. these changes
started as an effort to factor forkpty in terms of login_tty, which
returns an error and skips fd reassignment and closing if setting the
controlling terminal failed. the previous forkpty code was unable to
handle errors in the child, and did not attempt to; it just silently
ignored them. but this would have been unacceptable when switching to
using login_tty, since the child would start with the wrong stdin,
stdout, and stderr and thereby clobber the parent's files.
the new code uses the same technique as the posix_spawn implementation
to convey any possible error in the child to the parent so that the
parent can report failure to the caller. it is also safe against
thread cancellation and against signal delivery in the child prior to
the determination of success.
Rich Felker [Sun, 21 Dec 2014 04:38:25 +0000 (23:38 -0500)]
block pthread cancellation in openpty function
being a nonstandard function, this isn't strictly necessary, but it's
inexpensive and avoids unpleasant surprises. eventually I would like
all functions in libc to be safe against cancellation, either ignoring
it or acting on it cleanly.
Rich Felker [Sun, 21 Dec 2014 04:22:57 +0000 (23:22 -0500)]
don't write openpty results until success is determined
not only is this semantically more correct; it also reduces code size
slightly by eliminating the need for the compiler to assume the
possibility of aliasing.
Felix Janda [Sun, 21 Dec 2014 01:13:27 +0000 (20:13 -0500)]
add login_tty function
Rich Felker [Sun, 21 Dec 2014 00:49:19 +0000 (19:49 -0500)]
set optopt in getopt_long
this is undocumented but possibly expected behavior of GNU
getopt_long, and useful when error message printing has been
suppressed.
Rich Felker [Sun, 21 Dec 2014 00:44:37 +0000 (19:44 -0500)]
add error message printing to getopt_long and make related improvements
some related changes are also made to getopt, and the return value of
getopt_long in the case of missing arguments is fixed.
Rich Felker [Sat, 20 Dec 2014 05:05:29 +0000 (00:05 -0500)]
support translation for getopt error messages
Rich Felker [Sat, 20 Dec 2014 04:59:54 +0000 (23:59 -0500)]
fix stderr locking and ferror semantics in getopt message printing
if writing the error message fails, POSIX requires that ferror(stderr)
be set. and as a function that operates on a stdio stream, getopt is
required to lock the stream it uses, stderr.
fwrite calls are used instead of fprintf since there is a demand from
some users not to pull in heavy stdio machinery via getopt. this
mimics the original code using write.
Rich Felker [Fri, 19 Dec 2014 01:44:51 +0000 (20:44 -0500)]
use tkill instead of tgkill in implementing raise
this shaves off a useless syscall for getting the caller's pid and
brings raise into alignment with other functions which were adapted to
use tkill rather than tgkill.
commit
83dc6eb087633abcf5608ad651d3b525ca2ec35e documents the
rationale for this change, and in particular why the tgkill syscall is
useless for its designed purpose of avoiding races.
Rich Felker [Thu, 18 Dec 2014 22:41:34 +0000 (17:41 -0500)]
don't suppress sign output for NANs in printf
formally, it seems a sign is only required when the '+' modifier
appears in the format specifier, in which case either '+' or '-' must
be present in the output. but the specification is written such that
an optional negative sign is part of the output format anyway, and the
simplest approach to fixing the problem is removing the code that was
suppressing the sign.
Rich Felker [Thu, 18 Dec 2014 21:42:21 +0000 (16:42 -0500)]
fix return value computation in one code path of wcsnrtombs
the affected code was wrongly counting characters instead of bytes.
Rich Felker [Wed, 17 Dec 2014 21:52:37 +0000 (16:52 -0500)]
fix signedness of WINT_MIN expression
since wint_t is unsigned, WINT_MIN needs to expand to an unsigned zero.
Rich Felker [Wed, 17 Dec 2014 21:47:34 +0000 (16:47 -0500)]
make the definition of _Complex_I explicitly complex
it's unclear whether compilers which provide pure imaginary types
might produce a pure imaginary expression for 1.0fi. using 0.0f+1.0fi
ensures that the result is explicitly complex and makes this obvious
to human readers too.
Rich Felker [Wed, 17 Dec 2014 21:44:43 +0000 (16:44 -0500)]
make the result of the cimag macro a non-lvalue
this change is not necessary but helps diagnose invalid code. based on
patch by Jens Gustedt.
Rich Felker [Wed, 17 Dec 2014 21:34:41 +0000 (16:34 -0500)]
fix definition of CMPLX macros in complex.h to work in constant expressions
based on patches by Jens Gustedt. these macros need to be usable in
static initializers, and the old definitions were not.
there is no portable way to provide correct definitions for these
macros unless the compiler supports pure imaginary types. a portable
definition is provided for this case even though there are presently
no compilers that can use it. gcc and compatible compilers provide a
builtin function that can be used, but clang fails to support this and
instead requires a construct which is a constraint violation and which
is only a constant expression as a clang-specific extension.
since these macros are a namespace violation in pre-C11 profiles, and
since no known pre-C11 compilers provide any way to define them
correctly anyway, the definitions have been made conditional on C11.
Rich Felker [Wed, 17 Dec 2014 21:08:50 +0000 (16:08 -0500)]
provide CMPLX macros in implementation-internal libm.h
this avoids assuming the presence of C11 macro definitions in the
public complex.h, which need changes potentially incompatible with the
way these macros are being used internally.
Nagy Szabolcs [Fri, 10 Oct 2014 10:09:03 +0000 (12:09 +0200)]
implement FNM_CASEFOLD extension to fnmatch function
Rich Felker [Wed, 17 Dec 2014 19:40:35 +0000 (14:40 -0500)]
add basic dns record parsing functions
based on patch by Timo Teräs, with some corrections to bounds checking
code and other minor changes.
while they are borderline scope creep, the functions added are fairly
small and are roughly the minimum code needed to use the results of
the res_query API without re-implementing error-prone DNS packet
parsing, and they are used in practice by some kerberos related
software and possibly other things. at this time there is no intent to
implement further nameser.h API functions.
Rich Felker [Wed, 17 Dec 2014 08:08:53 +0000 (03:08 -0500)]
correctly handle write errors encountered by printf-family functions
previously, write errors neither stopped further output attempts nor
caused the function to return an error to the caller. this could
result in silent loss of output, possibly in the middle of output in
the event of a non-permanent error.
the simplest solution is temporarily clearing the error flag for the
target stream, then suppressing further output when the error flag is
set and checking/restoring it at the end of the operation to determine
the correct return value.
since the wide version of the code internally calls the narrow fprintf
to perform some of its underlying operations, initial clearing of the
error flag is suppressed when performing a narrow vfprintf on a
wide-oriented stream. this is not a problem since the behavior of
narrow operations on wide-oriented streams is undefined.
Rich Felker [Sat, 13 Dec 2014 19:22:58 +0000 (14:22 -0500)]
simplify getopt_long argv permutation loop logic
Rich Felker [Sat, 13 Dec 2014 06:04:21 +0000 (01:04 -0500)]
fix handling of "--" with getopt_long argv permutation
if argv permutation is used, the option terminator "--" should be
moved before any skipped non-option arguments rather than being left
in the argv tail where the caller will see and interpret it.
Rich Felker [Thu, 11 Dec 2014 06:07:02 +0000 (01:07 -0500)]
accept null longopts pointer in getopt_long
this is an undocumented feature of GNU getopt_long that the BSD
version also mimics, and is reportedly needed by some programs.
Rich Felker [Thu, 11 Dec 2014 02:29:01 +0000 (21:29 -0500)]
fix getopt handling of initial '+' in optstring
in the case where an initial '+' was passed in optstring (a
getopt_long feature to suppress argv permutation), getopt would fail
to see a possible subsequent ':', resulting in incorrect handling of
missing arguments.
Rich Felker [Thu, 11 Dec 2014 02:26:49 +0000 (21:26 -0500)]
support abbreviated options in getopt_long
Rich Felker [Thu, 11 Dec 2014 01:25:32 +0000 (20:25 -0500)]
support options after non-option arguments in getopt_long (argv permutation)
Bobby Bingham [Tue, 9 Dec 2014 02:18:12 +0000 (20:18 -0600)]
don't shadow functions with macros in C++
C++ programmers typically expect something like "::function(x,y)" to work
and may be surprised to find that "(::function)(x,y)" is actually required
due to the headers declaring a macro version of some standard functions.
We already omit function-like macros for C++ in most cases where there is
a real function available. This commit extends this to the remaining
function-like macros which have a real function version.
Rich Felker [Sat, 6 Dec 2014 02:19:39 +0000 (21:19 -0500)]
use direct syscall rather than write function in posix_spawn child
the write function is a cancellation point and accesses thread-local
state belonging to the calling thread in the parent process. since
cancellation is blocked for the duration of posix_spawn, this is
probably safe, but it's fragile and unnecessary. making the syscall
directly is just as easy and clearly safe.
Rich Felker [Sat, 6 Dec 2014 02:15:41 +0000 (21:15 -0500)]
don't fail posix_spawn on failed close
the resolution of austin group issue #370 removes the requirement that
posix_spawn fail when the close file action is performed on an
already-closed fd. since there are no other meaningful errors for
close, just ignoring the return value completely is the simplest fix.
Rich Felker [Thu, 4 Dec 2014 15:23:33 +0000 (10:23 -0500)]
fix getopt handling of ':' modifier for multibyte option characters
the previous hard-coded offsets of +1 and +2 contained a hidden
assumption that the option character matched was single-byte, despite
this implementation of getopt attempting to support multibyte option
characters. this patch reworks the matching logic to leave the final
index pointing just past the matched character so that fixed offsets
can be used to check for ':'.
Timo Teräs [Wed, 3 Dec 2014 14:09:37 +0000 (16:09 +0200)]
add arm private syscall numbers
it is part of kernel uapi, and some programs (e.g. nodejs) do use them
Rich Felker [Wed, 3 Dec 2014 03:17:52 +0000 (22:17 -0500)]
fix return value of pthread_getaffinity_np and pthread_setaffinity_np
these functions are expected to return an error code rather than
setting errno and returning -1.
Rich Felker [Wed, 3 Dec 2014 02:54:36 +0000 (21:54 -0500)]
fix uninitialized output from sched_getaffinity
the sched_getaffinity syscall only fills a cpu set up to the set size
used/supported by the kernel. the rest is left untouched and userspace
is responsible for zero-filling it based on the return value of the
syscall.
Gianluca Anzolin [Tue, 25 Nov 2014 07:56:03 +0000 (08:56 +0100)]
add support for non-option arguments extension to getopt
this is a GNU extension, activated by including '-' as the first
character of the options string, whereby non-option arguments are
processed as if they were arguments to an option character '\1' rather
than ending option processing.
Rich Felker [Sun, 23 Nov 2014 21:17:57 +0000 (16:17 -0500)]
adapt dynamic linker for new binutils versions that omit DT_RPATH
the new DT_RUNPATH semantics for search order are always used, and
since binutils had always set both DT_RPATH and DT_RUNPATH when the
latter was used, processing only DT_RPATH worked fine. however, recent
binutils has stopped generating DT_RPATH when DT_RUNPATH is used,
which broke support for this feature completely.
Rich Felker [Sun, 23 Nov 2014 19:33:01 +0000 (14:33 -0500)]
fix tabs/spaces in memcpy.s
this file had been a mess that went unnoticed ever since it was
imported. some lines used spaces for indention while others used tabs,
and tabs were used for alignment.
Rich Felker [Sun, 23 Nov 2014 19:27:45 +0000 (14:27 -0500)]
fix build regression in arm asm for setjmp/longjmp with old assemblers
Rich Felker [Sun, 23 Nov 2014 19:12:14 +0000 (14:12 -0500)]
fix build regression in arm asm for memcpy
commit
27828f7e9adb6b4f93ca56f6f98ef4c44bb5ed4e fixed compatibility
with clang's internal assembler, but broke compatibility with gas and
the traditional arm asm syntax by switching to the arm "unified
assembler language" (UAL). recent versions of gas also support UAL,
but require the .syntax directive to be used to switch to it. clang on
the other hand defaults to UAL. and old versions of gas (still
relevant) don't support UAL at all.
for the conditional ldm/stm instructions, "ia" is default and can just
be omitted, resulting in a mnemonic that's compatible with both
traditional and UAL syntax. but for byte/halfword loads and stores,
there seems to be no mnemonic compatible with both, and thus .word is
used to produce the desired opcode explicitly. the .inst directive is
not used because it is not compatible with older assemblers.
Joakim Sindholt [Thu, 6 Nov 2014 17:57:56 +0000 (18:57 +0100)]
arm assembly changes for clang compatibility
Rich Felker [Sun, 23 Nov 2014 02:50:13 +0000 (21:50 -0500)]
unify non-inline version of syscall code across archs
except powerpc, which still lacks inline syscalls simply because
nobody has written the code, these are all fallbacks used to work
around a clang bug that probably does not exist in versions of clang
that can compile musl. however, it's useful to have the generic
non-inline code anyway, as it eases the task of porting to new archs:
writing inline syscall code is now optional. this approach could also
help support compilers which don't understand inline asm or lack
support for the needed register constraints.
mips could not be unified because it has special fixup code for broken
layout of the kernel's struct stat.
Rich Felker [Sun, 23 Nov 2014 02:06:40 +0000 (21:06 -0500)]
inline 5- and 6-argument syscalls on arm
Rich Felker [Sun, 23 Nov 2014 01:50:01 +0000 (20:50 -0500)]
remove old clang workarounds from arm syscall implementation
the register constraints in the non-clang case were tested to work on
clang back to 3.2, and earlier versions of clang have known bugs that
preclude building musl.
there may be other reasons to prefer not to use inline syscalls, but
if so the function-call-based implementations should be added back in
a unified way for all archs.
Rich Felker [Sat, 22 Nov 2014 17:26:38 +0000 (12:26 -0500)]
fix __aeabi_read_tp oversight in arm atomics/tls overhaul
calls to __aeabi_read_tp may be generated by the compiler to access
TLS on pre-v6 targets. previously, this function was hard-coded to
call the kuser helper, which would crash on kernels with kuser helper
removed.
to fix the problem most efficiently, the definition of __aeabi_read_tp
is moved so that it's an alias for the new __a_gettp. however, on v7+
targets, code to initialize the runtime choice of thread-pointer
loading code is not even compiled, meaning that defining
__aeabi_read_tp would have caused an immediate crash due to using the
default implementation of __a_gettp with a HCF instruction.
fortunately there is an elegant solution which reduces overall code
size: putting the native thread-pointer loading instruction in the
default code path for __a_gettp, so that separate default/native code
paths are not needed. this function should never be called before
__set_thread_area anyway, and if it is called early on pre-v6
hardware, the old behavior (crashing) is maintained.
ideally __aeabi_read_tp would not be called at all on v7+ targets
anyway -- in fact, prior to the overhaul, the same problem existed,
but it was never caught by users building for v7+ with kuser disabled.
however, it's possible for calls to __aeabi_read_tp to end up in a v7+
binary if some of the object files were built for pre-v7 targets, e.g.
in the case of static libraries that were built separately, so this
case needs to be handled.
Rich Felker [Wed, 19 Nov 2014 05:40:32 +0000 (00:40 -0500)]
overhaul ARM atomics/tls for performance and compatibility
previously, builds for pre-armv6 targets hard-coded use of the "kuser
helper" system for atomics and thread-pointer access, resulting in
binaries that fail to run (crash) on systems where this functionality
has been disabled (as a security/hardening measure) in the kernel.
additionally, builds for armv6 hard-coded an outdated/deprecated
memory barrier instruction which may require emulation (extremely
slow) on future models.
this overhaul replaces the behavior for all pre-armv7 builds (both of
the above cases) to perform runtime detection of the appropriate
mechanisms for barrier, atomic compare-and-swap, and thread pointer
access. detection is based on information provided by the kernel in
auxv: presence of the HWCAP_TLS bit for AT_HWCAP and the architecture
version encoded in AT_PLATFORM. direct use of the instructions is
preferred when possible, since probing for the existence of the kuser
helper page would be difficult and would incur runtime cost.
for builds targeting armv7 or later, the runtime detection code is not
compiled at all, and much more efficient versions of the non-cas
atomic operations are provided by using ldrex/strex directly rather
than wrapping cas.
Rich Felker [Wed, 19 Nov 2014 05:34:29 +0000 (00:34 -0500)]
save auxv pointer into libc struct early in dynamic linker startup
this allows most code to assume it has already been saved, and is a
prerequisite for upcoming changes for arm atomic/tls operations.
Felix Fietkau [Tue, 21 Oct 2014 20:24:50 +0000 (22:24 +0200)]
getopt: fix optional argument processing
Processing an option character with optional argument fails if the
option is last on the command line. This happens because the
if (optind >= argc) check runs first before testing for optional
argument.
Jens Gustedt [Sun, 9 Nov 2014 10:18:08 +0000 (11:18 +0100)]
implement a private state for the uchar.h functions
The C standard is imperative on that:
7.28.1 ... If ps is a null pointer, each function uses its own internal
mbstate_t object instead, which is initialized at program startup to
the initial conversion state;
and these functions are also not supposed to implicitly use the state of
the wchar.h functions:
7.29.6.3 ... The implementation behaves as if no library function calls
these functions with a null pointer for ps.
Previously this resulted in two bugs.
- The functions c16rtomb and mbrtoc16 would crash when called with ps
set to null.
- The function mbrtoc32 used the private state of mbrtowc, which it
is not allowed to do.
Rich Felker [Sat, 15 Nov 2014 17:16:19 +0000 (12:16 -0500)]
fix behavior of printf with alt-form octal, zero precision, zero value
in this case there are two conflicting rules in play: that an explicit
precision of zero with the value zero produces no output, and that the
'#' modifier for octal increases the precision sufficiently to yield a
leading zero. ISO C (7.19.6.1 paragraph 6 in C99+TC3) includes a
parenthetical remark to clarify that the precision-increasing behavior
takes precedence, but the corresponding text in POSIX off of which I
based the implementation is missing this remark.
this issue was covered in WG14 DR#151.
Szabolcs Nagy [Wed, 5 Nov 2014 21:13:58 +0000 (22:13 +0100)]
math: use fnstsw consistently instead of fstsw in x87 asm
fnstsw does not wait for pending unmasked x87 floating-point exceptions
and it is the same as fstsw when all exceptions are masked which is the
only environment libc supports.
Szabolcs Nagy [Wed, 5 Nov 2014 20:40:29 +0000 (21:40 +0100)]
math: fix x86_64 and x32 asm not to use sahf instruction
Some early x86_64 cpus (released before 2006) did not support sahf/lahf
instructions so they should be avoided (intel manual says they are only
supported if CPUID.80000001H:ECX.LAHF-SAHF[bit 0] = 1).
The workaround simplifies exp2l and expm1l because fucomip can be
used instead of the fucomp;fnstsw;sahf sequence copied from i386.
In fmodl and remainderl sahf is replaced by a simple bit test.
Rich Felker [Wed, 5 Nov 2014 05:38:40 +0000 (00:38 -0500)]
fix 64-bit syscall argument passing on or1k
the kernel syscall interface for or1k does not expect 64-bit arguments
to be aligned to "even" register boundaries. this incorrect alignment
broke truncate/ftruncate and as well as a few less-common syscalls.
Rich Felker [Fri, 31 Oct 2014 19:35:24 +0000 (15:35 -0400)]
fix uninitialized mode variable in openat function
this was introduced in commit
2da3ab1382ca8e39eb1e4428103764a81fba73d3
as an oversight while making the variadic argument access conditional.
Szabolcs Nagy [Tue, 28 Oct 2014 23:34:37 +0000 (00:34 +0100)]
math: use the rounding idiom consistently
the idiomatic rounding of x is
n = x + toint - toint;
where toint is either 1/EPSILON (x is non-negative) or 1.5/EPSILON
(x may be negative and nearest rounding mode is assumed) and EPSILON is
according to the evaluation precision (the type of toint is not very
important, because single precision float can represent the 1/EPSILON of
ieee binary128).
in case of FLT_EVAL_METHOD!=0 this avoids a useless store to double or
float precision, and the long double code became cleaner with
1/LDBL_EPSILON instead of ifdefs for toint.
__rem_pio2f and __rem_pio2 functions slightly changed semantics:
on i386 a double-rounding is avoided so close to half-way cases may
get evaluated differently eg. as sin(pi/4-eps) instead of cos(pi/4+eps)
Szabolcs Nagy [Tue, 28 Oct 2014 23:25:50 +0000 (00:25 +0100)]
fix rint.c and rintf.c when FLT_EVAL_METHOD!=0
The old code used the rounding idiom incorrectly:
y = (double)(x + 0x1p52) - 0x1p52;
the cast is useless if FLT_EVAL_METHOD==0 and causes a second rounding
if FLT_EVAL_METHOD==2 which can give incorrect result in nearest rounding
mode, so the correct idiom is to add/sub a power-of-2 according to the
characteristics of double_t.
This did not cause actual bug because only i386 is affected where rint
is implemented in asm.
Other rounding functions use a similar idiom, but they give correct
results because they only rely on getting a neighboring integer result
and the rounding direction is fixed up separately independently of the
current rounding mode. However they should be fixed to use the idiom
correctly too.
Rich Felker [Fri, 31 Oct 2014 00:08:40 +0000 (20:08 -0400)]
fix invalid access by openat to possibly-missing variadic mode argument
the mode argument is only required to be present when the O_CREAT or
O_TMPFILE flag is used.
Rich Felker [Fri, 31 Oct 2014 00:03:56 +0000 (20:03 -0400)]
fix failure of open to read variadic mode argument for O_TMPFILE
Rich Felker [Mon, 20 Oct 2014 04:22:51 +0000 (00:22 -0400)]
manually "shrink wrap" fast path in pthread_once
this change is a workaround for the inability of current compilers to
perform "shrink wrapping" optimizations. in casual testing, it roughly
doubled the performance of pthread_once when called on an
already-finished once control object.
Rich Felker [Tue, 14 Oct 2014 17:32:42 +0000 (13:32 -0400)]
release 1.1.5
Rich Felker [Tue, 14 Oct 2014 16:30:50 +0000 (12:30 -0400)]
suppress macro definitions of ctype functions under C++
based on patch by Sergey Dmitrouk.
Rich Felker [Tue, 14 Oct 2014 00:59:42 +0000 (20:59 -0400)]
implement uchar.h (C11 UTF-16/32 conversion) interfaces
Rich Felker [Mon, 13 Oct 2014 22:26:28 +0000 (18:26 -0400)]
eliminate global waiters count in pthread_once