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2013-12-01add infrastructure to record and report the version of libc.soRich Felker-3/+39
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.
2013-11-29increase TTY_NAME_MAX limit to 32Rich Felker-1/+1
the old value of 20 was reported by Laurent Bercot as being insufficient for a reasonable real-world usage case. actual problem was the internal buffer used by ttyname(), but the implementation of ttyname uses TTY_NAME_MAX, and for consistency it's best to increase both. the new value is aligned with glibc.
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.
2013-11-26adjust fallback INFINITY definition for FLT_EVAL_METHOD==2 caseRich Felker-1/+1
on archs with excess precision, the floating point constant 1e40f may be evaluated such that it does not actually produce an infinity. 1e5000f is sufficiently large to produce an infinity for all supported floating point formats. note that this definition of INFINITY is only used for old or non-GNUC compilers anyway; despite being a portable, conforming definition, it leads to erroneous warnings on many compilers and thus using the builtin is preferred.
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
2013-11-24restore type of NULL to void * except when used in C++ programsRich Felker-0/+33
unfortunately this eliminates the ability of the compiler to diagnose some dangerous/incorrect usage, but POSIX requires (as an extension to the C language, i.e. CX shaded) that NULL have type void *. plain C allows it to be defined as any null pointer constant. the definition 0L is preserved for C++ rather than reverting to plain 0 to avoid dangerous behavior in non-conforming programs which use NULL as a variadic sentinel. (it's impossible to use (void *)0 for C++ since C++ lacks the proper implicit pointer conversions, and other popular alternatives like the GCC __null extension seem non-conforming to the standard's requirements.)
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-1/+10
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
2013-11-24use 0 instead of NULL in headers where NULL is not definedSzabolcs Nagy-3/+3
some macros in sys/mtio.h and syslog.h used NULL without defining it
2013-11-23add O_TMPFILE flag, new in linux 3.11Szabolcs Nagy-0/+6
definition in linux: #define O_TMPFILE (__O_TMPFILE | O_DIRECTORY) where __O_TMPFILE and O_DIRECTORY are arch specific
2013-11-23add TCP_NOTSENT_LOWAT tcp socket option, new in linux v3.12Szabolcs Nagy-0/+1
2013-11-23add linux tcp state enumsTimo Teräs-0/+12
2013-11-23add multicast structures from RFC 3678 to netinet/in.hTimo Teräs-1/+42
and use _GNU_SOURCE || _BSD_SOURCE guards for all of the RFC 3678 namespace polluting things like glibc/uclibc does.
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.
2013-11-23timeradd/timersub: cast result to void to get rid of warningsrofl0r-2/+2
previously: timersub(&now, t, &diff); warning: value computed is not used [-Wunused-value]
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/+19
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/+26
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
2013-11-20fix the nominal type of LDBL_* limits on archs with ld64Rich Felker-16/+16
previously these macros wrongly had type double rather than long double. I see no way an application could detect the error in C99, but C11's _Generic can trivially detect it. at the same time, even though these archs do not have excess precision, the number of decimal places used to represent these constants has been increased to 21 to be consistent with the decimal representations used for the DBL_* macros.
2013-11-20write floating point limit constants to 21 significant decimal placesRich Felker-10/+10
this is enough to produce the correct value even if the constant is interpreted as 80-bit extended precision, which matters on archs with excess precision (FLT_EVAL_METHOD==2) under at least some interpretations of the C standard. the shorter representations, while correct if converted to the nominal precision at translation time, could produce an incorrect value at extended precision, yielding results such as (double)DBL_MAX != DBL_MAX.
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.
2013-11-09adjust sys/wait.h not to produde errors in strict ISO C feature profileRich Felker-3/+7
siginfo_t is not available from signal.h when the strict ISO C feature profile (e.g. passing -std=c99 to gcc without defining any other feature test macros) is used, but the type is needed to declare waitid. using sys/wait.h (or any POSIX headers) in strict ISO C mode is an application bug, but in the interest of compatibility, it's best to avoid producing gratuitous errors. the simplest fix I could find is suppressing the declaration of waitid (and also signal.h inclusion, since it's not needed for anything else) in this case, while still exposing everything else in sys/wait.h
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.
2013-10-30fix inttypes.h PRI and SCN macros for [u]intptr_t typesRich Felker-11/+13
while using "l" unconditionally gave the right behavior due to matching sizes/representations, it was technically UB and produced compiler warnings with format string checking.
2013-10-29POSIX conformance fix: define struct entry in search.hSzabolcs Nagy-9/+9
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.