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2013-12-19fix hangs in localtime for near-overflowing time_t values on 64-bit archsRich Felker-0/+6
2013-12-14fix dynamic linker entry point for microblazeRich Felker-3/+4
the ABI allows the callee to clobber stack slots that correspond to arguments passed in registers, so the caller must adjust the stack pointer to reserve space appropriately. prior to this fix, the argv array was possibly clobbered by dynamic linker code before passing control to the main program.
2013-12-13optimize get_current_dir_name to reduce stack bloatRich Felker-3/+1
our getcwd already (as an extension) supports allocation of a buffer when the buffer argument is a null pointer, so there's no need to duplicate the allocation logic in this wrapper function. duplicating it is actually harmful in that it doubles the stack usage from PATH_MAX to 2*PATH_MAX.
2013-12-13use 0 instead of NULL for null pointer constantsRich Felker-15/+8
and thereby remove otherwise-unnecessary inclusion of stddef.h
2013-12-12include cleanups: remove unused headers and add feature test macrosSzabolcs Nagy-207/+68
2013-12-12remove an unnecessary check in inet_ptonSzabolcs Nagy-2/+1
at most 4 hexadecimal digits are processed in one field so the value cannot overflow. the netdb.h header was not used.
2013-12-12math: define _GNU_SOURCE when implementing non-standard math functionsSzabolcs Nagy-0/+6
this makes the prototypes in math.h are visible so they are checked agaist the function definitions
2013-12-06add posix_close, accepted for inclusion in the next issue of POSIXRich Felker-0/+6
this is purely a wrapper for close since Linux does not support EINTR semantics for the close syscall.
2013-12-02implement FNM_LEADING_DIR extension flag in fnmatchRich Felker-2/+9
previously this flag was defined and accepted as a no-op, possibly breaking some software that uses it. given the choice to remove the definition and possibly break applications that were already working, or simply implement the feature, the latter turned out to be easy enough to make the decision easy. in the case where the FNM_PATHNAME flag is also set, this implementation is clean and essentially optimal. otherwise, it's an inefficient "brute force" implementation. at some point, when cleaning up and refactoring this code, I may add a more direct code path for handling FNM_LEADING_DIR in the non-FNM_PATHNAME case, but at this point my main interest is avoiding introducing new bugs in the code that implements the standard fnmatch features specified by POSIX.
2013-12-01add infrastructure to record and report the version of libc.soRich Felker-2/+19
this is still experimental and subject to change. for git checkouts, an attempt is made to record the exact revision to aid in bug reports and debugging. no version information is recorded in the static libc.a or binaries it's linked into.
2013-12-01fix fnmatch corner cases related to escapingRich Felker-4/+4
the FNM_PATHNAME logic for advancing by /-delimited components was incorrect when the / character was escaped (i.e. \/), and a final \ at the end of pattern was not handled correctly.
2013-12-01fix the end of string matching in fnmatch with FNM_PATHNAMESzabolcs Nagy-2/+2
a '/' in the pattern could be incorrectly matched against the terminating null byte in the string causing arbitrarily long sequence of out-of-bounds access in fnmatch("/","",FNM_PATHNAME)
2013-11-30support mix of IPv4 and v6 nameservers in resolv.confRich Felker-5/+31
a v6 socket will only be used if there is at least one v6 nameserver address. if the kernel lacks v6 support, the code will fall back to using a v4 socket and requests to v6 servers will silently fail. when using a v6 socket, v4 addresses are converted to v4-mapped form and setsockopt is used to ensure that the v6 socket can accept both v4 and v6 traffic (this is on-by-default on Linux but the default is configurable in /proc and so it needs to be set explicitly on the socket level). this scheme avoids increasing resource usage during lookups and allows the existing network io loop to be used without modification. previously, nameservers whose address family did not match the address family of the first-listed nameserver were simply ignored. prior to recent __ipparse fixes, they were not ignored but erroneously parsed.
2013-11-27reject invalid address families in getaddrinfoRich Felker-0/+3
subsequent code assumes the address family requested is either unspecified or one of IPv4/IPv6, and could malfunction if this constraint is not met, so other address families should be explicitly rejected.
2013-11-26fix off-by-one length failure in strftime/wcsftime and improve error behaviorRich Felker-12/+16
these functions were spuriously failing in the case where the buffer size was exactly the number of bytes/characters to be written, including null termination. since these functions do not have defined error conditions other than buffer size, a reasonable application may fail to check the return value when the format string and buffer size are known to be valid; such an application could then attempt to use a non-terminated buffer. in addition to fixing the bug, I have changed the error handling behavior so that these functions always null-terminate the output except in the case where the buffer size is zero, and so that they always write as many characters as possible before failing, rather than dropping whole fields that do not fit. this actually simplifies the logic somewhat anyway.
2013-11-25remove duplicate includes from dynlink.c, strfmon.c and getaddrinfo.cSzabolcs Nagy-7/+0
2013-11-24shadow: Implement fgetspentMichael Forney-1/+10
2013-11-24shadow: Move spent parsing to internal functionMichael Forney-31/+40
2013-11-24Fix dn_comp prototype and add stubMichael Forney-0/+9
This function is used by ping6 from iputils.
2013-11-24shadow: Implement putspentMichael Forney-5/+13
2013-11-24math: clean up __rem_pio2Szabolcs Nagy-71/+53
- remove the HAVE_EFFICIENT_IRINT case: fn is an exact integer, so it can be converted to int32_t a bit more efficiently than with a cast (the rounding mode change can be avoided), but musl does not support this case on any arch. - __rem_pio2: use double_t where possible - __rem_pio2f: use less assignments to avoid stores on i386 - use unsigned int bit manipulation (and union instead of macros) - use hexfloat literals instead of named constants
2013-11-23Fix dn_expand pointer followingMichael Forney-1/+1
2013-11-23putgrent: Add missing newlineMichael Forney-0/+1
2013-11-23putgrent: Stop writing output on first failureMichael Forney-2/+3
This way, if an fprintf fails, we get an incomplete group entry rather than a corrupted one.
2013-11-23strcmp: Remove unnecessary check for *rMichael Forney-1/+1
If *l == *r && *l, then by transitivity, *r.
2013-11-22fix and refactor child reaping logic in wordexpRich Felker-6/+16
loop condition was incorrect and confusing and caused an infinite loop when (broken) applications reaped the pid from a signal handler or another thread before wordexp's call to waitpid could do so.
2013-11-22fix fd leak and case where fd 1 is already closed in wordexpRich Felker-4/+4
2013-11-22fix resource exhaustion and zero-word cases in wordexpRich Felker-8/+18
when WRDE_NOSPACE is returned, the we_wordv and we_wordc members must be valid, because the interface contract allows them to return partial results. in the case of zero results (due either to resource exhaustion or a zero-word input) the we_wordv array still should contain a terminating null pointer and the initial we_offs null pointers. this is impossible on resource exhaustion, so a correct application must presumably check for a null pointer in we_wordv; POSIX however seems to ignore the issue. the previous code may have crashed under this situation.
2013-11-22improve robustness of wordexp and fix handling of 0-word caseRich Felker-11/+16
avoid using exit status to determine if a shell error occurred, since broken programs may install SIGCHLD handlers which reap all zombies, including ones that don't belong to them. using clone and __WCLONE does not seem to work for avoiding this problem since exec resets the exit signal to SIGCHLD. instead, the new code uses a dummy word at the beginning of the shell's output, which is ignored, to determine whether the command was executed successfully. this also fixes a corner case where a word string containing zero words was interpreted as a single zero-length word rather than no words at all. POSIX does not seem to require this case to be supported anyway, though. in addition, the new code uses the correct retry idiom for waitpid to ensure that spurious STOP/CONT signals in the child and/or EINTR in the parent do not prevent successful wait for the child, and blocks signals in the child.
2013-11-21add legacy getloadavg apiSzabolcs Nagy-0/+18
2013-11-20fix fd leak (missing close-on-exec) in getifaddrsRich Felker-1/+1
2013-11-21math: add (obsolete) bsd drem and finite functionsSzabolcs Nagy-0/+20
2013-11-21math: lgamma cleanup (simpler sin(pi*x) for the negative case)Szabolcs Nagy-202/+110
* simplify sin_pi(x) (don't care about inexact here, the result is inexact anyway, and x is not so small to underflow) * in lgammal add the previously removed special case for x==1 and x==2 (to fix the sign of zero in downward rounding mode) * only define lgammal on supported long double platforms * change tgamma so the generated code is a bit smaller
2013-11-11iswspace: fix handling of 0rofl0r-2/+1
2013-11-09fix harmless inconsistency in semtimedopRich Felker-1/+1
this should not matter since the reality is that either all the sysv sem syscalls are individual syscalls, or all of them are multiplexed on the SYS_ipc syscall (depending on arch). but best to be consistent anyway.
2013-11-09implement semtimedopRich Felker-0/+14
this is a Linux-specific extension to the sysv semaphore api.
2013-11-08remove O_NOFOLLOW from __map_file used for time zone file loadingRich Felker-1/+1
it's not clear why I originally wrote O_NOFOLLOW into this; I suspect the reason was with an aim of making the function more general for mapping partially or fully untrusted files provided by the user. however, the timezone code already precludes use of absolute or relative pathnames in suid/sgid programs, and disallows .. in pathnames which are relative to one of the system timezone locations, so there is no threat of opening a symlink which is not trusted by appropriate user. since some users may wish to put symbolic links in the zoneinfo directories to alias timezones, it seems preferable to allow this.
2013-11-08fix handling of overly-long TZ environment variable valuesRich Felker-1/+1
the rest of the code is not prepared to handle an empty TZ string, so falling back to __gmt ("GMT"), just as if TZ had been blank or unset, is the preferable action.
2013-11-04timezone parser: fix iteration over search dir pathsrofl0r-1/+1
try+l points to \0, so only one iteration was ever tried.
2013-11-04timezone parser: fix offset to transition table in 64bit code pathrofl0r-1/+1
we need to skip to the second TZif header, which starts at skip+44, and then skip another header (20 bytes) plus the following 6 32bit values.
2013-11-04fix timezone parser code crashing on 64bit sysrofl0r-1/+1
if sizeof(time_t) == 8, this code path was missing the correct offset into the zoneinfo file, using the header magic to do offset calculations. the 6 32bit fields to be read start at offset 20.
2013-11-02fix regression in inet_aton due to misinterpretation of __ipparse returnRich Felker-3/+3
inet_aton returns a boolean success value, whereas __ipparse returns 0 on success and -1 on failure. also change the conditional in inet_addr to be consistent with other uses of __ipparse where only negative values are treated as failure.
2013-11-01simplify faccessat AT_EACCESS path and eliminate resource dependenceRich Felker-14/+21
now that we're waiting for the exit status of the child process, the result can be conveyed in the exit status rather than via a pipe. since the error value might not fit in 7 bits, a table is used to translate possible meaningful error values to small integers.
2013-11-01fix faccessat AT_EACCESS path not to leave zombie processesRich Felker-2/+6
I mistakenly assumed that clone without a signal produced processes that would not become zombies; however, waitpid with __WCLONE is required to release their pids.
2013-10-29POSIX conformance fix: define struct entry in search.hSzabolcs Nagy-8/+8
2013-10-28fenv: fix i386 fesetround for sseSzabolcs Nagy-1/+1
i386 fenv code checks __hwcap for sse support, but in fesetround the sse code was unconditionally jumped over after the test so the sse rounding mode was never set.
2013-10-28math: extensive log*.c cleanupSzabolcs Nagy-583/+369
The log, log2 and log10 functions share a lot of code and to a lesser extent log1p too. A small part of the code was kept separately in __log1p.h, but since it did not capture much of the common code and it was inlined anyway, it did not solve the issue properly. Now the log functions have significant code duplication, which may be resolved later, until then they need to be modified together. logl, log10l, log2l, log1pl: * Fix the sign when the return value should be -inf. * Remove the volatile hack from log10l (seems unnecessary) log1p, log1pf: * Change the handling of small inputs: only |x|<2^-53 is special (then it is enough to return x with the usual subnormal handling) this fixes the sign of log1p(0) in downward rounding. * Do not handle the k==0 case specially (other than skipping the elaborate argument reduction) * Do not handle 1+x close to power-of-two specially (this code was used rarely, did not give much speed up and the precision wasn't better than the general) * Fix the correction term formula (c=1-(u-x) was used incorrectly when x<1 but (double)(x+1)==2, this was not a critical issue) * Use the exact same method for calculating log(1+f) as in log (except in log1p the c correction term is added to the result). log, logf, log10, log10f, log2, log2f: * Use double_t and float_t consistently. * Now the first part of log10 and log2 is identical to log (until the return statement, hopefully this makes maintainence easier). * Most special case formulas were removed (close to power-of-two and k==0 cases), they increase the code size without providing precision or performance benefits (and obfuscate the code). Only x==1 is handled specially so in downward rounding mode the sign of zero is correct (the general formula happens to give -0). * For x==0 instead of -1/0.0 or -two54/0.0, return -1/(x*x) to force raising the exception at runtime. * Arg reduction code is changed (slightly simplified) * The thresholds for arg reduction to [sqrt(2)/2,sqrt(2)] are now consistently the [0x3fe6a09e00000000,0x3ff6a09dffffffff] and the [0x3f3504f3,0x3fb504f2] intervals for double and float reductions respectively (the exact threshold values are not critical) * Remove the obsolete comment for the FLT_EVAL_METHOD!=0 case in log2f (The same code is used for all eval methods now, on i386 slightly simpler code could be used, but we have asm there anyway) all: * Fix signed int arithmetics (using unsigned for bitmanipulation) * Fix various comments
2013-10-25add legacy ftime function and sys/timeb.hRich Felker-0/+12
despite being marked legacy, this was specified by SUSv3 as part of the XSI option; only the most recent version of the standard dropped it. reportedly there's actual code using it.
2013-10-23fix inet_ptonSzabolcs Nagy-26/+19
* parse IPv4 dotted-decimal correctly (without strtoul, no leading zeros) * disallow single leading ':' in IPv6 address * allow at most 4 hex digits in IPv6 address (according to RFC 2373) * have enough hex fields in IPv4 mapped IPv6 address * disallow leading zeros in IPv4 mapped IPv6 address
2013-10-22fix __ipparse to parse the generic numbers-and-dots IPv4 format correctlySzabolcs Nagy-5/+12
* allow at most 4 parts * bounds check the parts correctly * disallow leading whitespace and sign * check the address family before falling back to IPv6