path: root/src/stdio
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2019-03-21support archs with no renameat syscall, only renameat2Drew DeVault-2/+4
2019-03-12setvbuf: return failure if mode is invalidA. Wilcox-1/+3
POSIX requires setvbuf to return non-zero if `mode` is not one of _IONBF, _IOLBF, or _IOFBF.
2019-02-13fix behavior of gets when input line contains a null byteRich Felker-3/+8
the way gets was implemented in terms of fgets, it used the location of the null termination to determine where to find and remove the newline, if any. an embedded null byte prevented this from working. this also fixes a one-byte buffer overflow, whereby when gets read an N-byte line (not counting newline), it would store two null terminators for a total of N+2 bytes. it's unlikely that anyone would care that a function whose use is pretty much inherently a buffer overflow writes too much, but it could break the only possible correct uses of this function, in conjunction with input of known format from a trusted/same-privilege-domain source, where the buffer length may have been selected to exactly match a line length contract. there seems to be no correct way to implement gets in terms of a single call to fgets or scanf, and using multiple calls would require explicit locking, so we might as well just write the logic out explicitly character-at-a-time. this isn't fast, but nobody cares if a catastrophically unsafe function that's so bad it was removed from the C language is fast.
2018-11-02fix failure to flush stderr when fflush(0) is calledRich Felker-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 Felker-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.
2018-10-18further optimize getc/putc when locking is neededRich Felker-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.
2018-10-18fix build regression due to missing file for putc changesRich Felker-0/+22
commit d664061adb4d7f6647ab2059bc351daa394bf5da inadvertently omitted the new file putc.h.
2018-10-18bypass indirection through pointer objects to access stdin/out/errRich Felker-9/+15
by ABI, the public stdin/out/err macros use extern pointer objects, and this is necessary to avoid copy relocations that would be expensive and make the size of the FILE structure part of the ABI. however, internally it makes sense to access the underlying FILE objects directly. this avoids both an indirection through the GOT to find the address of the stdin/out/err pointer objects (which can't be computed PC-relative because they may have been moved to the main program by copy relocations) and an indirection through the resulting pointer object. in most places this is just a minor optimization, but in the case of getchar and putchar (and the unlocked versions thereof), ipa constant propagation makes all accesses to members of stdin/out PC-relative or GOT-relative, possibly reducing register pressure as well.
2018-10-17optimize hot paths of putc with manual shrink-wrappingRich Felker-13/+8
this is the analog of commit dd8f02b7dce53d6b1c4282439f1636a2d63bee01, but for putc.
2018-10-17optimize hot paths of getc with manual shrink-wrappingRich Felker-15/+30
with these changes, in a program that has not created any threads besides the main thread and that has not called f[try]lockfile, getc performs indistinguishably from getc_unlocked. this was measured on several i386 and x86_64 models, and should hold on other archs too simply by the properties of the code generation. the case where the caller already holds the lock (via flockfile) is improved significantly as well (40-60% reduction in time on machines tested) and the case where locking is needed is improved somewhat (roughly 10%). the key technique used here is forcing the non-hot path out-of-line and enabling it to be a tail call. a static noinline function (conditional on __GNUC__) is used rather than the extern hiddens used elsewhere for this purpose, so that the compiler can choose non-default calling conventions, making it possible to tail-call to a callee that takes more arguments than the caller on archs where arguments are passed on the stack or must have space reserved on the stack for spilling the. the tid could just be reloaded via the thread pointer in locking_getc, but that would be ridiculously expensive on some archs where thread pointer load requires a trap or syscall.
2018-10-16move stdio locking MAYBE_WAITERS definition to stdio_impl.hRich Felker-4/+0
don't repeat definition in two places.
2018-09-18fix race condition in file lockingKaarle Ritvanen-6/+6
The condition occurs when - thread #1 is holding the lock - thread #2 is waiting for it on __futexwait - thread #1 is about to release the lock and performs a_swap - thread #3 enters the __lockfile function and manages to grab the lock before thread #1 calls __wake, resetting the MAYBE_WAITERS flag - thread #1 calls __wake - thread #2 wakes up but goes again to __futexwait as the lock is held by thread #3 - thread #3 releases the lock but does not call __wake as the MAYBE_WAITERS flag is not set This condition results in thread #2 not being woken up. This patch fixes the problem by making the woken up thread ensure that the flag is properly set before going to sleep again. Mainainer's note: This fixes a regression introduced in commit c21f750727515602a9e84f2a190ee8a0a2aeb2a1.
2018-09-16getdelim: only grow buffer when necessary, improve OOM behaviorRich Felker-10/+17
commit b114190b29417fff6f701eea3a3b3b6030338280 introduced spurious realloc of the output buffer in cases where the result would exactly fit in the caller-provided buffer. this is contrary to a strict reading of the spec, which only allows realloc when the provided buffer is "of insufficient size". revert the adjustment of the realloc threshold, and instead push the byte read by getc_unlocked (for which the adjustment was made) back into the stdio buffer if it does not fit in the output buffer, to be read in the next loop iteration. in order not to leave a pushed-back byte in the stdio buffer if realloc fails (which would violate the invariant that logical FILE position and underlying open file description offset match for unbuffered FILEs), the OOM code path must be changed. it would suffice move just one byte in this case, but from a QoI perspective, in the event of ENOMEM the entire output buffer (up to the allocated length reported via *n) should contain bytes read from the FILE stream. otherwise the caller has no way to distinguish trunated data from uninitialized buffer space. the SIZE_MAX/2 check is removed since the sum of disjoint object sizes is assumed not to be able to overflow, leaving just one OOM code path.
2018-09-16fix null pointer subtraction and comparison in stdioRich Felker-29/+39
morally, for null pointers a and b, a-b, a<b, and a>b should all be defined as 0; however, C does not define any of them. the stdio implementation makes heavy use of such pointer comparison and subtraction for buffer logic, and also uses null pos/base/end pointers to indicate that the FILE is not in the corresponding (read or write) mode ready for accesses through the buffer. all of the comparisons are fixed trivially by using != in place of the relational operators, since the opposite relation (e.g. pos>end) is logically impossible. the subtractions have been reviewed to check that they are conditional the stream being in the appropriate reading- or writing-through-buffer mode, with checks added where needed. in fgets and getdelim, the checks added should improve performance for unbuffered streams by avoiding a do-nothing call to memchr, and should be negligible for buffered streams.
2018-09-16fix failure of getdelim to set stream orientation on errorRich Felker-0/+2
if EINVAL or ENOMEM happened before the first getc_unlocked, it was possible that the stream orientation had not yet been set.
2018-09-12split internal lock API out of libc.h, creating lock.hRich Felker-1/+1
this further reduces the number of source files which need to include libc.h and thereby be potentially exposed to libc global state and internals. this will also facilitate further improvements like adding an inline fast-path, if we want to do so later.
2018-09-12remove spurious inclusion of libc.h for LFS64 ABI aliasesRich Felker-14/+7
the LFS64 macro was not self-documenting and barely saved any characters. simply use weak_alias directly so that it's clear what's being done, and doesn't depend on a header to provide a strange macro.
2018-09-12reduce spurious inclusion of libc.hRich Felker-12/+19
libc.h was intended to be a header for access to global libc state and related interfaces, but ended up included all over the place because it was the way to get the weak_alias macro. most of the inclusions removed here are places where weak_alias was needed. a few were recently introduced for hidden. some go all the way back to when libc.h defined CANCELPT_BEGIN and _END, and all (wrongly implemented) cancellation points had to include it. remaining spurious users are mostly callers of the LOCK/UNLOCK macros and files that use the LFS64 macro to define the awful *64 aliases. in a few places, new inclusion of libc.h is added because several internal headers no longer implicitly include libc.h. declarations for __lockfile and __unlockfile are moved from libc.h to stdio_impl.h so that the latter does not need libc.h. putting them in libc.h made no sense at all, since the macros in stdio_impl.h are needed to use them correctly anyway.
2018-09-12hide purely dependency-triggering functions in stdio __toread & __towriteRich Felker-2/+2
2018-09-12overhaul internally-public declarations using wrapper headersRich Felker-8/+4
commits leading up to this one have moved the vast majority of libc-internal interface declarations to appropriate internal headers, allowing them to be type-checked and setting the stage to limit their visibility. the ones that have not yet been moved are mostly namespace-protected aliases for standard/public interfaces, which exist to facilitate implementing plain C functions in terms of POSIX functionality, or C or POSIX functionality in terms of extensions that are not standardized. some don't quite fit this description, but are "internally public" interfacs between subsystems of libc. rather than create a number of newly-named headers to declare these functions, and having to add explicit include directives for them to every source file where they're needed, I have introduced a method of wrapping the corresponding public headers. parallel to the public headers in $(srcdir)/include, we now have wrappers in $(srcdir)/src/include that come earlier in the include path order. they include the public header they're wrapping, then add declarations for namespace-protected versions of the same interfaces and any "internally public" interfaces for the subsystem they correspond to. along these lines, the wrapper for features.h is now responsible for the definition of the hidden, weak, and weak_alias macros. this means source files will no longer need to include any special headers to access these features. over time, it is my expectation that the scope of what is "internally public" will expand, reducing the number of source files which need to include *_impl.h and related headers down to those which are actually implementing the corresponding subsystems, not just using them.
2018-09-12move __stdio_exit_needed to stdio_impl.hRich Felker-4/+0
this functions is glue for linking dependency logic.
2018-09-12make internal declarations for flockfile tracking functions checkableRich Felker-4/+0
logically these belong to the intersection of the stdio and pthread subsystems, and either place the declarations could go (stdio_impl.h or pthread_impl.h) requires a forward declaration for one of the argument types.
2018-09-12fix issues from public functions defined without declaration visibleRich Felker-0/+2
policy is that all public functions which have a public declaration should be defined in a context where that public declaration is visible, to avoid preventable type mismatches. an audit performed using GCC's -Wmissing-declarations turned up the violations corrected here. in some cases the public header had not been included; in others, a feature test macro needed to make the declaration visible had been omitted. in the case of gethostent and getnetent, the omission seems to have been intentional, as a hack to admit a single stub definition for both functions. this kind of hack is no longer acceptable; it's UB and would not fly with LTO or advanced toolchains. the hack is undone to make exposure of the declarations possible.
2018-08-30prevent perror from clobbering stderr's orientationRich Felker-0/+8
this requirement is specified by POSIX.
2018-08-29make vfprintf set stream orientation even for zero-length outputRich Felker-1/+2
if no output is produced, no underlying fwrite will ever be called, but byte-oriented printf functions are still required to set the orientation of the stream to byte-oriented. call __towrite explicitly if the FILE is not already in write mode.
2018-08-29re-fix vfprintf temporary buffer logicRich Felker-2/+2
commit b5a8b28915aad17b6f49ccacd6d3fef3890844d1 setup the write buffer bound pointers for the temporary buffer manually to fix a buffer overflow issue, but in doing so, caused vfprintf on unbuffered files never to call __towrite, thereby failing to set the stream orientation to byte-oriented, failing to clear any prior read mode, and failing to produce an error when the stream is not writable. revert the inline setup of the bounds pointers and instead zero them, so that the underlying fwrite code will call __towrite to set them up.
2018-08-29fix missing flush of stderr at exit if it was put in buffered modeRich Felker-0/+1
commit 0b80a7b0404b6e49b0b724e3e3fe0ed5af3b08ef added the ability to set application-provided stdio FILE buffers, adding the possibility that stderr might be buffered at exit time, but __stdio_exit did not have code to flush it. this regression was not present in any release.
2018-08-28vfwprintf: honor field width with 'c' format typeA. Wilcox-1/+4
2018-08-28set stream orientations in open_[w]memstreamRich Felker-0/+3
fundamentally there is no good reason these functions need to set an orientation (morally it should be possible to write a wchar_t[] memory stream using byte functions, or a char[] memory stream using wide functions), but it's a part of the specification that they do. aside from being able to inspect the orientation with fwide, failure to set the orientation in open_wmemstream is observable if the locale changes between open_wmemstream and the first operation on the stream; this is because the encoding rule (locale) for the stream is required to be bound at the time the stream becomes wide-oriented. for open_wmemstream, call fwide to avoid duplicating the logic for binding the encoding rule. for open_memstream it suffices just to set the mode field in the FILE struct.
2018-08-28make fmemopen's w+ mode truncate the bufferRich Felker-0/+1
the w+ mode is specified to "truncate the buffer contents". like most of fmemopen, exactly what this means is underspecified. mode w and w+ of course implicitly 'truncate' the buffer if a write from the initial position is flushed, so in order for this part of the text about w+ not to be spurious, it should be interpreted as requiring something else, and the obvious reasonable interpretation is that the truncation is immediately visible if you attempt to read from the stream or the buffer before writing/flushing. this interpretation agrees with reported conformance test failures.
2018-08-28set errno when fileno is called on a FILE with no underlying fdRich Felker-4/+7
this is a POSIX requirement. also remove the gratuitous locking shenanigans and simply access f->fd under control of the lock. there is no advantage to not doing so, and it made the correctness non-obvious at best.
2018-08-23fix printf precision specifier for hex floats on non-ld80 archsRich Felker-0/+1
the code to perform rounding to the desired precision wrongly assumed the long double mantissa was an integral number of nibbles (hex digits) in length. this is true for 80-bit extended precision (64-bit mantissa) but not for double (53) or quad (113). scale the rounding value by 1<<(LDBL_MANT_DIG%4) to compensate.
2018-07-13fix writes outside buffer by ungetc after setvbufRich Felker-1/+1
commit 0b80a7b0404b6e49b0b724e3e3fe0ed5af3b08ef, which added non-stub setvbuf, applied the UNGET pushback adjustment to the size of the buffer passed in, but inadvertently omitted offsetting the start by the same amount, thereby allowing unget to clobber up to 8 bytes before the start of the buffer. this bug was introduced in the present release cycle; no releases are affected.
2018-04-19setvbuf: minor comment typo fixWill Dietz-1/+1
2018-04-18add support for caller-provided buffers to setvbufRich Felker-11/+14
2018-04-18clean up allocation/setup logic for open_[w]memstreamRich Felker-38/+50
bring these functions up to date with the current idioms we use/prefer in fmemopen and fopencookie.
2018-04-18clean up allocation/setup logic for fmemopenRich Felker-21/+31
rather than manually performing pointer arithmetic to carve multiple objects out of one allocation, use a containing struct that encompasses them all.
2018-04-18minor cleanup in fopencookieRich Felker-5/+2
assign entire struct rather than member-at-a-time. don't repeat buffer sizes; always use sizeof to ensure consistency.
2018-04-18refactor flockfile not to duplicate lock mechanism logicRich Felker-12/+14
2018-04-18fix stdio lock dependency on read-after-free not faultingRich Felker-20/+24
instead of using a waiters count, add a bit to the lock field indicating that the lock may have waiters. threads which obtain the lock after contending for it will perform a potentially-spurious wake when they release the lock.
2018-02-24fix aliasing violations in fgetpos/fsetposRich Felker-2/+2
add a member of appropriate type to the fpos_t union so that accesses are well-defined. use long long instead of off_t since off_t is not always exposed in stdio.h and there's no namespace-clean alias for it. access is still performed using pointer casts rather than by naming the union member as a matter of style; to the extent possible, the naming of fields in opaque types defined in the public headers is not treated as an API contract with the implementation. access via the pointer cast is valid as long as the union has a member of matching type.
2018-02-24in vswprintf, initialize the FILE rather than memset-and-assignRich Felker-9/+8
this is the idiom that's used elsewhere and should be more efficient or at least no worse.
2018-02-24remove unused MIN macro from getdelim source fileRich Felker-2/+0
2018-02-24remove useless null check before call to free in fcloseRich Felker-1/+1
2018-02-24remove useless and confusing parentheses in stdio __towrite functionRich Felker-1/+1
they seem to be relics of e3cd6c5c265cd481db6e0c5b529855d99f0bda30 where this code was refactored from a check that previously masked against (F_ERR|F_NOWR) instead of just F_NOWR.
2018-02-24avoid use of readv syscall in __stdio_read backend when not neededRich Felker-1/+2
formally, calling readv with a zero-length first iov component should behave identically to calling read on just the second component, but presence of a zero-length iov component has triggered bugs in some kernels and performs significantly worse than a simple read on some file types.
2018-02-24consistently return number of bytes read from stdio read backendRich Felker-2/+2
the stdio FILE read backend's return type is size_t, not ssize_t, and all of the special (non-fd-backed) FILE types already return the number of bytes read (zero) on error or eof. only __stdio_read leaked a syscall error return into its return value. fread had a workaround for this behavior going all the way back to the original check-in. remove the workaround since it's no longer needed.
2018-02-24remove obfuscated flags bit-twiddling logic in __stdio_readRich Felker-1/+1
replace with simple conditional that doesn't rely on assumption that cnt is either 0 or -1.
2018-02-11fix incorrect overflow check for allocation in fmemopenRich Felker-1/+1
when a null buffer pointer is passed to fmemopen, requesting it allocate its own memory buffer, extremely large size arguments near SIZE_MAX could overflow and result in underallocation. this results from omission of the size of the cookie structure in the overflow check but inclusion of it in the calloc call. instead of accounting for individual small contributions to the total allocation size needed, simply reject sizes larger than PTRDIFF_MAX, which will necessarily fail anyway. then adding arbitrary fixed-size structures is safe without matching up the expressions in the comparison and the allocation.
2018-01-10fix printf alt-form octal with value 0 and no explicit precisionRich Felker-2/+2
commit 78897b0dc00b7cd5c29af5e0b7eebf2396d8dce0 wrongly simplified Dmitry Levin's original submitted patch fixing alt-form octal with the zero flag and field width present, omitting the special case where the value is zero. as a result, printf("%#o",0) wrongly prints "00" rather than "0". the logic prior to this commit was actually better, in that it was aligned with how the alt-form flag (#) for printf is specified ("it shall increase the precision"). at the time there was no good way to avoid the zero flag issue with the old logic, but commit 167dfe9672c116b315e72e57a55c7769f180dffa added tracking of whether an explicit precision was provided. revert commit 78897b0dc00b7cd5c29af5e0b7eebf2396d8dce0 and switch to using the explicit precision indicator for suppressing the zero flag.