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2018-12-09add TRAP_UNK si_code to signal.h from linux v4.18Szabolcs Nagy1-0/+1
used for undiagnosed trap exceptions where linux previously set si_code to 0. new in linux commit db78e6a0a6f9f7d7277965600eeb1a5b3a6f55a8
2018-12-09add SIGSYS support to sys/signalfd.h from linux v4.18Szabolcs Nagy1-1/+5
new in linux commit 76b7f670730e87974f71df9f6129811e2769666e in struct signalfd_siginfo the pad member is changed to __pad to keep the namespace clean, it's not part of the public api.
2018-12-09add AF_XDP to sys/socket.h from linux v4.18Szabolcs Nagy1-1/+4
new address family and related macros were added in linux commit 68e8b849b221b37a78a110a0307717d45e3593a0
2018-12-09update netinet/udp.h for linux v4.18Szabolcs Nagy1-0/+3
add UDP_NO_CHECK6_* to restrict zero UDP6 checksums, new in linux commit 1c19448c9ba6545b80ded18488a64a7f3d8e6998 (pre-v4.18 change, was missed) add UDP_SEGMENT to support generic segmentation offload for udp datagrams, bec1f6f697362c5bc635dacd7ac8499d0a10a4e7 (new in v4.18)
2018-12-09update netinet/tcp.h for linux v4.18Szabolcs Nagy1-0/+18
add packet delivery info to tcp_info, new in linux commit feb5f2ec646483fb66f9ad7218b1aad2a93a2a5c add TCP_ZEROCOPY_RECEIVE socket option for zerocopy receive, new in linux commit 05255b823a6173525587f29c4e8f1ca33fd7677d add TCP_INQ socket option and TCP_CM_INQ cmsg to get in-queue bytes in cmsg upon read, new in linux commit b75eba76d3d72e2374fac999926dafef2997edd2 add TCP_REPAIR_* to fix repair socket window probe patch, new in linux commit 31048d7aedf31bf0f69c54a662944632f29d82f2
2018-12-09fix wordexp not to read past end of string ending with lone backslashRich Felker1-1/+1
2018-12-02fix memccpy to not access buffer past given sizeQuentin Rameau1-1/+1
memccpy would return a pointer over the given size when c is not found in the source buffer and n reaches 0.
2018-11-19fix regression in access to optopt objectRich Felker1-0/+1
commit b9410061e2ad6fe91bb3910c3adc7d4a315b7ce9 inadvertently omitted optopt from the "dynamic list", causing it to be split into separate objects that don't share their value if the main program contains a copy relocation for it (for non-PIE executables that access it, and some PIE ones, depending on arch and toolchain versions/options).
2018-11-08optimize two-way strstr and memmem bad character shiftRich Felker2-2/+2
first, the condition (mem && k < p) is redundant, because mem being nonzero implies the needle is periodic with period exactly p, in which case any byte that appears in the needle must appear in the last p bytes of the needle, bounding the shift (k) by p. second, the whole point of replacing the shift k by mem (=l-p) is to prevent shifting by less than mem when discarding the memory on shift, in which case linear time could not be guaranteed. but as written, the check also replaced shifts greater than mem by mem, reducing the benefit of the shift. there is no possible benefit to this reduction of the shift; since mem is being cleared, the full shift is valid and more optimal. so only replace the shift by mem when it would be less than mem.
2018-11-02fix regression in setlocale for LC_ALL with per-category settingRich Felker1-1/+1
commit d88e5dfa8b989dafff4b748bfb3cba3512c8482e inadvertently changed the argument pased to __get_locale from part (the current ;-delimited component) to name (the full string).
2018-11-02fix failure to flush stderr when fflush(0) is calledRich Felker1-1/+4
commit ddc947eda311331959c73dbc4491afcfe2326346 fixed the corresponding bug for exit which was introduced when commit 0b80a7b0404b6e49b0b724e3e3fe0ed5af3b08ef added support for caller-provided buffers, making it possible for stderr to be a buffered stream.
2018-11-02fix deadlock and buffered data loss race in fcloseRich Felker1-13/+19
fflush(NULL) and __stdio_exit lock individual FILEs while holding the open file list lock to walk the list. since fclose first locked the FILE to be closed, then the ofl lock, it could deadlock with these functions. also, because fclose removed the FILE to be closed from the open file list before flushing and closing it, a concurrent fclose or exit could complete successfully before fclose flushed the FILE it was closing, resulting in data loss. reorder the body of fclose to first flush and close the file, then remove it from the open file list only after unlocking it. this creates a window where consumers of the open file list can see dead FILE objects, but in the absence of undefined behavior on the part of the application, such objects will be in an inactive-buffer state and processing them will have no side effects. __unlist_locked_file is also moved so that it's performed only for non-permanent files. this change is not necessary, but preserves consistency (and thereby provides safety/hardening) in the case where an application uses one of the standard streams after closing it while holding an explicit lock on it. such usage is of course undefined behavior.
2018-11-02__libc_start_main: slightly simplify stage2 pointer setupAlexander Monakov1-3/+4
Use "+r" in the asm instead of implementing a non-transparent copy by applying "0" constraint to the source value. Introduce a typedef for the function type to avoid spelling it out twice.
2018-11-02remove commented-out debug printf from strstrRich Felker1-1/+0
this was leftover from before the initial commit.
2018-11-02fix spuriously slow check in twoway strstr/memmem coresRich Felker2-2/+2
mem0 && mem && ... is redundant since mem can only be nonzero when mem0 is nonzero.
2018-10-22don't omit setting errno in internal __map_file functionRich Felker1-2/+2
a caller needs the reason for open (or fstat, albeit unlikely) failure if it's going to make decisions about continuing a path search or similar.
2018-10-22make the default locale (& a variant) failure-free cases for newlocaleRich Felker1-1/+20
commit aeeac9ca5490d7d90fe061ab72da446c01ddf746 introduced fail-safe invariants that creating a locale_t object for the C locale or C.UTF-8 locale will always succeed. extend the guarantee to also cover the following: - newlocale(LC_ALL_MASK, "", 0) - newlocale(LC_ALL_MASK-LC_CTYPE_MASK, "C", 0) provided that the LANG/LC_* environment variables have not been changed by the program. these usages are idiomatic for getting the default locale, and for getting a locale that behaves as the C locale except for honoring the default locale's character encoding.
2018-10-22simplify newlocale and allow failure for explicit locale namesRich Felker1-23/+14
unify the code paths for allocated and non-allocated locale objects, always using a tmp object. this is necessary to avoid clobbering the base locale object too soon if we allow for the possibility that looking up an explicitly requested locale name may fail, and makes the code simpler and cleaner anyway. eliminate the complex and fragile logic for checking whether one of the non-allocated locale objects can be used for the result, and instead just memcmp against each of them.
2018-10-20remove volatile qualification from category pointers in __locale_structRich Felker1-1/+1
commit 63c188ec42e76ff768e81f6b65b11c68fc43351e missed making this change when switching from atomics to locking for modification of the global locale, leaving access to locale structures unnecessarily burdened with the restrictions of volatile. the volatile qualification was originally added in commit 56fbaa3bbe73f12af2bfbbcf2adb196e6f9fe264.
2018-10-20adapt setlocale to support possibility of failureRich Felker2-12/+22
introduce a new LOC_MAP_FAILED sentinel for errors, since null pointers for a category's locale map indicate the C locale. at this time, __get_locale does not fail, so there should be no functional change by this commit.
2018-10-18adjust types in FILE struct to make line buffering check less expensiveRich Felker1-4/+2
the choice of signed char for lbf was a theoretically space-saving hack that was not helping, and was unwantedly expensive. while comparing bytes against a byte-sized member sounds easy, the trick here was that the byte to be compared was unsigned while the lbf member was signed, making it possible to set lbf negative to disable line buffering. however, this imposed a requirement to promote both operands, zero-extending one and sign-extending the other, in order to compare them. to fix this, repurpose the waiters count slot (unused since commit c21f750727515602a9e84f2a190ee8a0a2aeb2a1). while we're at it, switch mode (orientation) from signed char to int as well. this makes no semantic difference (its only possible values are -1, 0, and 1) but it might help on archs where byte access is awkward.
2018-10-18optimize internal putc_unlocked macro used in putcRich Felker1-1/+2
to check whether flush due to line buffering is needed, the int-type character argument must be truncated to unsigned char for comparison. if the original value is subsequently passed to __overflow, it must be preserved, adding to register pressure. since it doesn't matter, truncate all uses so the original value is no longer live.
2018-10-18fix wrong result for putc variants due to operator precedenceRich Felker1-1/+1
the internal putc_unlocked macro was wrongly returning a meaningless boolean result rather than the written character or EOF. bug was found by reading (very surprising) asm.
2018-10-18further optimize getc/putc when locking is neededRich Felker2-10/+10
check whether the lock is free before loading the calling thread's tid. if so, just use a dummy tid value that cannot compare equal to any actual thread id (because it's one bit wider). this also avoids the need to save the tid and pass it to locking_getc or locking_putc, reducing register pressure. this change might slightly hurt the case where the caller already holds the lock, but it does not affect the single-threaded case, and may significantly improve the multi-threaded case, especially on archs where loading the thread pointer is disproportionately expensive like early mips and arm ISA levels. but even on i386 it helps, at least on some machines; I measured roughly a 10-15% improvement.
2018-10-18use prototype for function pointer in static link libc init barrierRich Felker1-1/+1
this is not needed for correctness, but doesn't hurt, and in some cases the compiler may pessimize the call assuming the callee might be variadic when it lacks a prototype.
2018-10-18fix error in constraints for static link libc init barrierRich Felker1-1/+1
commit 4390383b32250a941ec616e8bff6f568a801b1c0 inadvertently used "r" instead of "0" for the input constraint, which only happened to work for the configuration I tested it on because it usually makes sense for the compiler to choose the same input and output register.