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* glob: Simplify the interface for the GLOB_ALTDIRFUNC callback gl_readdirFlorian Weimer2016-05-092-1/+80
| | | | | | | | | | | | | | Previously, application code had to set up the d_namlen member if the target supported it, involving conditional compilation. After this change, glob will use the length of the string in d_name instead of d_namlen to determine the file name length. All glibc targets provide the d_type and d_ino members, and setting them as needed for gl_readdir is straightforward. Changing the behavior with regards to d_ino is left to a future cleanup. (cherry picked from commit 137fe72eca6923a00381a3ca9f0e7672c1f85e3f)
* malloc: Run fork handler as late as possible [BZ #19431]Florian Weimer2016-05-091-8/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | Previously, a thread M invoking fork would acquire locks in this order: (M1) malloc arena locks (in the registered fork handler) (M2) libio list lock A thread F invoking flush (NULL) would acquire locks in this order: (F1) libio list lock (F2) individual _IO_FILE locks A thread G running getdelim would use this order: (G1) _IO_FILE lock (G2) malloc arena lock After executing (M1), (F1), (G1), none of the threads can make progress. This commit changes the fork lock order to: (M'1) libio list lock (M'2) malloc arena locks It explicitly encodes the lock order in the implementations of fork, and does not rely on the registration order, thus avoiding the deadlock. (cherry picked from commit 29d794863cd6e03115d3670707cc873a9965ba92)
* Update INSTALL with latest versions tested to work.Carlos O'Donell2016-02-141-7/+6
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* Fix doc quoting problems with Texinfo 5Paul Eggert2016-01-101-0/+7
| | | | | | | | | | | | | | | Without this change, in the info file output, Texinfo 5 quotes code in text with undirected single quotes 'like this' and generates code examples that with many PDF readers cannot be cut out of PDFs and pasted into code. * manual/libc.texinfo: Configure the libc manual like the GNU Emacs manual, by using @documentencoding and setting txicodequoteundirected and txicodequotebacktick. This way, Texinfo 5 quotes code in text with directed single quotes ‘like this’ and produces examples that can be cut out of PDFs. This change causes Texinfo 5 to generate info files that contain UTF-8 characters in the set {'‘', '’', '“', '”', 'Ä', 'ä', 'ö', '−', '–', '—', '©', '⇒', '•', '…'}, which is OK nowadays.
* Make shebang interpreter directives consistentMarko Myllynen2016-01-074-4/+4
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* Update miscellaneous files from upstream sources.Joseph Myers2016-01-051-600/+1529
| | | | | | | | | | | This patch updates texinfo.tex, config.guess, config.sub and move-if-change from their respective upstream sources. * manual/texinfo.tex: Update to version 2016-01-04.21 with trailing whitespace removed. * scripts/config.guess: Update to version 2016-01-01. * scripts/config.sub: Update to version 2016-01-01. * scripts/move-if-change: Update from gnulib.
* Update copyright dates not handled by scripts/update-copyrights.Joseph Myers2016-01-041-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | I've updated copyright dates in glibc for 2016. This is the patch for the changes not generated by scripts/update-copyrights and subsequent build / regeneration of generated files. * NEWS: Update copyright dates. * catgets/gencat.c (print_version): Likewise. * csu/version.c (banner): Likewise. * debug/catchsegv.sh: Likewise. * debug/pcprofiledump.c (print_version): Likewise. * debug/xtrace.sh (do_version): Likewise. * elf/ldconfig.c (print_version): Likewise. * elf/ldd.bash.in: Likewise. * elf/pldd.c (print_version): Likewise. * elf/sotruss.sh: Likewise. * elf/sprof.c (print_version): Likewise. * iconv/iconv_prog.c (print_version): Likewise. * iconv/iconvconfig.c (print_version): Likewise. * locale/programs/locale.c (print_version): Likewise. * locale/programs/localedef.c (print_version): Likewise. * login/programs/pt_chown.c (print_version): Likewise. * malloc/memusage.sh (do_version): Likewise. * malloc/memusagestat.c (print_version): Likewise. * malloc/mtrace.pl: Likewise. * manual/libc.texinfo: Likewise. * nptl/version.c (banner): Likewise. * nscd/nscd.c (print_version): Likewise. * nss/getent.c (print_version): Likewise. * nss/makedb.c (print_version): Likewise. * posix/getconf.c (main): Likewise. * scripts/test-installation.pl: Likewise. * sysdeps/unix/sysv/linux/lddlibc4.c (main): Likewise.
* Update copyright dates with scripts/update-copyrights.Joseph Myers2016-01-0446-46/+46
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* Make obsolete syscall wrappers into compat symbols (bug 18472).Joseph Myers2015-12-141-2/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Various Linux kernel syscalls have become obsolete over time. Specifically, the following are obsolete in all kernel versions supported by glibc, are not present for architectures more recently added to the kernel, and as such, the wrapper functions for them should be compat symbols, not in static libc and not available for new links with shared libc. * bdflush: in Linux 2.6, does nothing if present. * create_module get_kernel_syms query_module: Linux 2.4 module interface, syscalls not present in Linux 2.6. * uselib: part of the mechanism for loading a.out shared libraries, irrelevant with ELF. This patch adds support for syscalls.list to list syscall aliases of the form NAME@VERSION:OBSOLETED, with SHLIB_COMPAT conditionals being generated for such aliases. Those five syscalls are then made into compat symbols (obsoleted in glibc 2.23, so future ports won't have these symbols at all), with the header <sys/kdaemon.h> declaring bdflush being removed. When we move to 3.2 as minimum kernel version, the same can be done for nfsservctl (removed in Linux 3.1) as well. Tested for x86_64 and x86 (testsuite, as well as checking that the symbols in question indeed become compat symbols, that they are indeed omitted from static libc, and that the generated SHLIB_COMPAT conditionals look right). [BZ #18472] * sysdeps/unix/Makefile ($(objpfx)stub-syscalls.c): Handle entries for the form NAME@VERSION:OBSOLETED and generate SHLIB_COMPAT conditionals for them. * sysdeps/unix/make-syscalls.sh (emit_weak_aliases): Likewise. * sysdeps/unix/sysv/linux/sys/kdaemon.h: Remove file. * sysdeps/unix/sysv/linux/Makefile (sysdep_headers): Remove sys/kdaemon.h. * sysdeps/unix/sysv/linux/syscalls.list (bdflush): Make into compat-only syscall, obsoleted in glibc 2.23. (create_module): Likewise. (get_kernel_syms): Likewise. (query_module): Likewise. (uselib): Likewise. * manual/sysinfo.texi (System Parameters): Do not mention bdflush.
* Split large string section; add truncation advicePaul Eggert2015-12-106-227/+250
| | | | | | | | | | | | * manual/examples/strncat.c: Remove. This example was misleading, as the code would have undefined behavior if "hello" was longer than SIZE. Anyway, the manual shouldn't encourage strncpy+strncat for this sort of thing. * manual/string.texi (Copying Strings and Arrays): Split into three sections Copying Strings and Arrays, Concatenating Strings, and Truncating Strings, as this section was way too long. All cross-referenced changed. Add advice about string-truncation functions. Remove misleading strncat example.
* Document best practice for disconnected NSS modules.Carlos O'Donell2015-12-101-0/+7
| | | | | | | | NSS modules which can run in disconnected modes should return NSS_STATUS_NOTFOUND and SUCCESS in order to follow best practice for such modules and ensure user applications can have these modules configured without causing problems if the data sources are not connected.
* Fix typo in strncat, wcsncat manual entriesPaul Eggert2015-12-041-4/+6
| | | | | | * manual/string.texi (Copying and Concatenation): Fix typos in sample implementations of strncat and wcsncat, by having them use the old value of the destination length, not the new one.
* Consistency about byte vs character in string.texiPaul Eggert2015-12-041-221/+236
| | | | | | | | | | | * manual/string.texi (String and Array Utilities): Distinguish more carefully among bytes, multibyte characters, and wide characters. Use "byte" when talking about C 'char', to distinguish it more clearly from multibyte characters. Say "wide character" or "multibyte character" instead of "character", when a wide or multibyte character is intended. Similarly for "multibyte string" versus "string". Define these terms more carefully.
* Remove CPU set size checking from affinity functions [BZ #19143]Florian Weimer2015-11-241-2/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | With current kernel versions, the check does not reliably detect that unavailable CPUs are requested, for these reasons: (1) The kernel will silently ignore non-allowed CPUs, that is, CPUs which are physically present but disallowed for the thread based on system configuration. (2) Similarly, CPU bits which lack an online CPU (possible CPUs) are ignored. (3) The existing probing code assumes that the CPU mask size is a power of two and at least 1024. Neither has it to be a power of two, nor is the minimum possible value 1024, so the value determined is often too large. This means that the CPU set size check in glibc accepts CPU bits beyond the actual hard system limit. (4) Future kernel versions may not even have a fixed CPU set size. After the removal of the probing code, the kernel still returns EINVAL if no CPU in the requested set remains which can run the thread after the affinity change. Applications which care about the exact affinity mask will have to query it using sched_getaffinity after setting it. Due to the effects described above, this commit does not change this. The new tests supersede tst-getcpu, which is removed. This addresses bug 19164 because the new tests allocate CPU sets dynamically. * nptl/check-cpuset.h: Remove. * nptl/pthread_attr_setaffinity.c (__pthread_attr_setaffinity_new): Remove CPU set size check. * nptl/pthread_setattr_default_np.c (pthread_setattr_default_np): Likewise. * sysdeps/unix/sysv/linux/check-cpuset.h: Remove. * sysdeps/unix/sysv/linux/pthread_setaffinity.c (__kernel_cpumask_size, __determine_cpumask_size): Remove. (__pthread_setaffinity_new): Remove CPU set size check. * sysdeps/unix/sysv/linux/sched_setaffinity.c (__kernel_cpumask_size): Remove. (__sched_setaffinity_new): Remove CPU set size check. * manual/threads.texi (Default Thread Attributes): Remove stale reference to check_cpuset_attr, determine_cpumask_size in comment. * sysdeps/unix/sysv/linux/Makefile [$(subdir) == posix] (tests): Remove tst-getcpu. Add tst-affinity, tst-affinity-pid. [$(subdir) == nptl] (tests): Add tst-thread-affinity-pthread, tst-thread-affinity-pthread2, tst-thread-affinity-sched. * sysdeps/unix/sysv/linux/tst-affinity.c: New file. * sysdeps/unix/sysv/linux/tst-affinity-pid.c: New file. * sysdeps/unix/sysv/linux/tst-skeleton-affinity.c: New skeleton test file. * sysdeps/unix/sysv/linux/tst-thread-affinity-sched.c: New file. * sysdeps/unix/sysv/linux/tst-thread-affinity-pthread.c: New file. * sysdeps/unix/sysv/linux/tst-thread-affinity-pthread2.c: New file. * sysdeps/unix/sysv/linux/tst-thread-skeleton-affinity.c: New skeleton test file. * sysdeps/unix/sysv/linux/tst-getcpu.c: Remove. Superseded by tst-affinity-pid.
* Require GCC 4.7 or later to build glibc.Joseph Myers2015-10-271-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch implements a requirement of GCC 4.7 or later to build glibc. This was discussed in the thread starting at <https://sourceware.org/ml/libc-alpha/2015-08/msg00851.html>. Concerns were expressed by Mike and David. At <https://sourceware.org/ml/libc-alpha/2015-10/msg00453.html> I have provided a 14-patch series showing in outline the cleanups facilitated by this version requirement, as requested by Mike (this patch is the first in that series, with the addition of a NEWS entry). Given the absence of further concerns or alternative proposals for criteria for updates to this version requirement as requested in <https://sourceware.org/ml/libc-alpha/2015-10/msg00065.html>, I am interpreting this as "absence of sustained opposition" under Carlos's definition at <https://sourceware.org/glibc/wiki/Consensus> and proposing this patch for inclusion in glibc. I'd like to remind people testing with 4.6 that if they move to testing with GCC 5 then it will probably be about four years before they need to update the compiler they use to test glibc again. Although on the principles of time-based updates I think a move to requiring binutils 2.23 would be reasonable, I'm not currently aware of any cleanups that would facilitate so am not proposing that at this time (but would expect to propose a move to requiring binutils 2.24 in a year's time, as that brings features such as AVX512 support that should allow some conditionals to be cleaned up). If someone thinks a move to requiring 2.23 would help clean things up for their architecture, please speak up. (And in general, I suspect there are lots of architecture-specific configure tests that could be removed on the basis of current GCC and binutils version requirements, given how I've found architecture-independent tests obsolete on the basis of version requirements going back 20 years.) Tested for x86_64 and x86 (testsuite, and that installed shared libraries are unchanged by the patch). * configure.ac (libc_cv_compiler_ok): Require GCC 4.7 or later. * configure: Regenerated. * manual/install.texi (Tools for Compilation): Document requirement for GCC 4.7 or later. * INSTALL: Regenerated.
* Convert 29 more function definitions to prototype style (multiple parameters ↵Joseph Myers2015-10-201-2/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | in one K&R parameter declaration). This automatically-generated patch converts 29 function definitions in glibc (including one in an example in the manual) from old-style K&R to prototype-style. Following my other recent such patches, this one deals with the case of function definitions where one K&R parameter declaration declares multiple parameters, as in: void foo (a, b) int a, *b; { } Tested for x86_64 and x86 (testsuite, and that installed stripped shared libraries are unchanged by the patch). * crypt/crypt.c (_ufc_doit_r): Convert to prototype-style function definition. (_ufc_doit_r): Likewise. * crypt/crypt_util.c (_ufc_copymem): Likewise. (_ufc_output_conversion_r): Likewise. * inet/inet_mkadr.c (__inet_makeaddr): Likewise. * inet/rcmd.c (rcmd_af): Likewise. (rcmd): Likewise. (ruserok_af): Likewise. (ruserok): Likewise. (ruserok2_sa): Likewise. (ruserok_sa): Likewise. (iruserok_af): Likewise. (iruserok): Likewise. (__ivaliduser): Likewise. (__validuser2_sa): Likewise. * inet/rexec.c (rexec_af): Likewise. (rexec): Likewise. * inet/ruserpass.c (ruserpass): Likewise. * locale/programs/xmalloc.c (xcalloc): Likewise. * manual/examples/timeval_subtract.c (timeval_subtract): Likewise. * math/w_drem.c (__drem): Likewise. * math/w_dremf.c (__dremf): Likewise. * math/w_dreml.c (__dreml): Likewise. * misc/daemon.c (daemon): Likewise. * resolv/res_debug.c (p_fqnname): Likewise. * stdlib/div.c (div): Likewise. * string/memcmp.c (memcmp_bytes): Likewise. * sunrpc/pmap_rmt.c (pmap_rmtcall): Likewise. * sunrpc/svc_udp.c (svcudp_bufcreate): Likewise.
* timezone: polish grammar a bit in documentationMike Frysinger2015-10-191-2/+2
| | | | Reported-by: ricaljasan@pacific.net
* malloc: Rewrite with explicit TLS access using __threadFlorian Weimer2015-10-171-4/+0
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* The va_list pointer is unspecified after a call to vfprintf [BZ #18982]Florian Weimer2015-10-171-14/+10
| | | | This adjusts the documentation to the existing implementation.
* manual/argp.texi (Specifying Argp Parsers): Fix typo.Namhyung Kim2015-10-141-1/+1
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* Fix manual argument order for posix_fallocate64 (Bug 19086).Carlos O'Donell2015-10-071-1/+1
| | | | | | | | | The argument order for posix_fallocate64 in the manual was wrong, it was listed as [fd, len, offset] when it should have been [fd, offset, len]. Verified io/fcntl.h has the right argument order, and it does. Verified generated PDF.
* Files open O_WRONLY not supported in fallocate emulation.Carlos O'Donell2015-09-291-0/+4
| | | | | | | | | | | | | | | | | In the posix_fallocate description in the manual we list various drawbacks with the emulation, including the fact that a file opened with O_APPEND fails with EBADF. Similarly a file opened with O_WRONLY fails with EBADF. We must be able to emulate a compare-and-swap via pread/compare/pwrite in order to make the emulation as safe as possible. It is not acceptable to ignore the read failure because it could result in significant data loss across all of the blocks. There is no other way to make this work without a true atomic CAS and SIGBUS handler (which is looking more attractive as a way to remove the race condition). This patch adds O_WRONLY to the manual as another bullet to clarify the limits of the emulation. Manual looks good in PDF.
* timezone: add a configure flag to disable program installMike Frysinger2015-09-181-0/+10
| | | | | | | | | Some distros build+install the timezone tools (zic/zdump/tzselect) outside of glibc and use the upstream package directly. Add a configure flag to glibc so they can disable install of those tools. This allows tests to run & pass regardless of the configure flag. Only the install of them is impacted.
* manual: skip build when perl is unavailableMike Frysinger2015-08-211-0/+3
| | | | | | | Do not try to generate the manual when perl is unavailable. This matches the behavior when makeinfo is unavailable. Otherwise the install step fails when trying to generate the libm section since it runs a perl script.
* Fix exponents in manual.Ondřej Bílka2015-08-204-23/+34
| | | | | | | * manual/macros.texi: Add twoexp macro. * manual/filesys.texi: Fix exponents. * manual/llio.texi: Likewise. * manual/stdio.texi: Likewise.
* PowerPC: Extend Program Priority Register supportGabriel F. T. Gomes2015-08-191-0/+18
| | | | | | | | | | | | This patch adds extra inline functions to change the Program Priority Register from ISA 2.07. 2015-08-19 Gabriel F. T. Gomes <gftg@linux.vnet.ibm.com> * sysdeps/powerpc/sys/platform/ppc.h (__ppc_set_ppr_med_high, __ppc_set_ppr_very_low): New functions. * manual/platform.texi: Add documentation about __ppc_set_ppr_med_high and __ppc_set_ppr_very_low.
* Attempting to install glibc configured with --prefix=/usr intoMartin Sebor2015-06-121-6/+8
| | | | | | | | a non-standard directory specified by the prefix make variable fails with an error. Since this is an unsupported use case, this change makes make install fail early and with a descriptive error message when either the prefix or the exec_prefix make variable is overridden on the command line.
* Start of series of patches with x86_64 vector math functions.Andrew Senkevich2015-06-091-0/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Here is implementation of cos containing SSE, AVX, AVX2 and AVX512 versions according to Vector ABI which had been discussed in <https://groups.google.com/forum/#!topic/x86-64-abi/LmppCfN1rZ4>. Vector math library build and ABI testing enabled by default for x86_64. * sysdeps/x86_64/fpu/Makefile: New file. * sysdeps/x86_64/fpu/Versions: New file. * sysdeps/x86_64/fpu/svml_d_cos_data.S: New file. * sysdeps/x86_64/fpu/svml_d_cos_data.h: New file. * sysdeps/x86_64/fpu/svml_d_cos2_core.S: New file. * sysdeps/x86_64/fpu/svml_d_cos4_core.S: New file. * sysdeps/x86_64/fpu/svml_d_cos4_core_avx.S: New file. * sysdeps/x86_64/fpu/svml_d_cos8_core.S: New file. * sysdeps/x86_64/fpu/svml_d_wrapper_impl.h: New file. * sysdeps/x86_64/fpu/multiarch/svml_d_cos2_core.S: New file. * sysdeps/x86_64/fpu/multiarch/svml_d_cos2_core_sse4.S: New file. * sysdeps/x86_64/fpu/multiarch/svml_d_cos4_core.S: New file. * sysdeps/x86_64/fpu/multiarch/svml_d_cos4_core_avx2.S: New file. * sysdeps/x86_64/fpu/multiarch/svml_d_cos8_core.S: New file. * sysdeps/x86_64/fpu/multiarch/svml_d_cos8_core_avx512.S: New file. * sysdeps/x86_64/fpu/multiarch/Makefile (libmvec-sysdep_routines): Added build of SSE, AVX2 and AVX512 IFUNC versions. * sysdeps/x86/fpu/bits/math-vector.h: Added SIMD declaration for cos. * math/bits/mathcalls.h: Added cos declaration with __MATHCALL_VEC. * sysdeps/x86_64/configure.ac: Options for libmvec build. * sysdeps/x86_64/configure: Regenerated. * sysdeps/x86_64/sysdep.h (cfi_offset_rel_rsp): New macro. * sysdeps/unix/sysv/linux/x86_64/libmvec.abilist: New file. * manual/install.texi (Configuring and compiling): Document --disable-mathvec. * INSTALL: Regenerated. * NEWS: Mention addition of libmvec and x86_64 vector cos.
* posix_fallocate: Emulation fixes and documentation [BZ #15661]Florian Weimer2015-06-051-0/+94
| | | | | | | | Handle signed integer overflow correctly. Detect and reject O_APPEND. Document drawbacks of emulation. This does not completely address bug 15661, but improves the situation somewhat.
* Fix typo in safety annotations in envz_removeSiddhesh Poyarekar2015-05-201-1/+1
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* Add envz_remove to the libc manualSiddhesh Poyarekar2015-05-191-0/+8
| | | | | | | | | | | | | | | | | | | | | I was told that Ma Shimao submitted a patch to add envz_remove to the libc manual, but the patch could not be accepted since he does not have a copyright assignment in place. I have been woefully behind on libc-alpha recently and have not seen the patch or the discussion thread. I have also not read the man page for envz_remove, so Alexandre Oliva asked me if I could write this independently and post a patch. The patch below is the result of the same - I have written it based on the implementation in string/envz.c and Alex told me via email that the function is AS, AC and MT-safe like envz_strip. I assume Alex and Carlos cannot review this since they have been tainted by the original patch (I haven't even tried to look for a link to it since I don't want to be tainted) so someone else will have to review this. If there are no reviewers till the end of the week, I will commit this since I believe there is a chance that there are no other reviewers who haven't read that thread. * manual/string.texi (Envz Functions): Add envz_remove.
* Avoid SIGFPE in wordexp [BZ #18100]Florian Weimer2015-03-231-1/+2
| | | | | Check for a zero divisor and integer overflow before performing division in arithmetic expansion.
* manual: fix XPG basename prototypeYaakov Selkowitz2015-03-121-1/+1
| | | | * manual/string.texi (XPG basename): Fix prototype.
* Document test-wrapper-env-only in INSTALL.Roland McGrath2015-03-061-8/+13
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* manual: complete example in error message documentationRical Jasan2015-03-061-6/+12
| | | | | | | | | | | | | | | | | | | | | | | | The manual gives "an example showing how to handle failure to open a file correctly." The example function, open_sesame, uses the newly-introduced strerror function and errno and program_invocation_short_name variables. It fails to specify GNU extensions, however, so attempts to use it in the following way: int main (void) {open_sesame ("badname");} fail during compilation with "error: ‘program_invocation_short_name’ undeclared", indicating the example is incomplete. The presence of "#include"s suggest everything neccesary for the function to work should be present. For completeness, the example is lacking the following line: #define _GNU_SOURCE as the declarations of program_invocation_*name in errno.h are wrapped in an "#ifdef __USE_GNU" conditional. The documentation of the variables is also expanded, adding that their definition lies in errno.h and noting specifically they are GNU extensions.
* manual: drop strerror C89 compatibility noteMike Frysinger2015-03-061-3/+0
| | | | | Mentioning systems that are old and don't support C89 is probably a waste of time nowadays. Drop the note.
* Refine documentation of libm exceptions goals.Joseph Myers2015-02-171-6/+13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch refines the math.texi documentation of the goals for when libm function raise the inexact and underflow exceptions. The previous text was problematic in some cases around the underflow threshold. * Strictly, it would have meant that if the mathematical result of pow was very slightly below DBL_MIN, for example, it was required to raise the underflow exception; although normally a few ulps error would be OK, if that error meant the computed value was slightly above DBL_MIN it would fail the previously described underflow exception goal. * Similarly, strict IEEE semantics would imply that sin (DBL_MIN), in round-to-nearest mode, underflows on before-rounding but not after-rounding architectures, while returning DBL_MIN; the previous wording would have required an underflow exception, so preventing checks for a result with absolute value below DBL_MIN from being sufficient checks to determine whether the exception is required. (Under the previous wording, checks for a result with absolute value <= DBL_MIN wouldn't have been sufficient either, because in FE_TOWARDZERO mode a result of DBL_MIN definitely does not result from an underflowing infinite-precision result.) * The previous wording about rounding infinite-precision values could be taken to mean all exceptions including "inexact" must be consistent with some such value. That would mean that a result of DBL_MIN in FE_UPWARD mode with "inexact" raised must also have "underflow" raised on before-rounding architectures. Again, that would cause problems for computing a result (possibly with spurious "inexact" exceptions) and then using a rounding-mode-independent test for results with absolute value below DBL_MIN to determine whether an underflow exception must be forced in case the underflows from intermediate computations happened to be exact. By refining the documentation, this patch avoids stating goals for accuracy close to the underflow threshold that were stricter than applied anywhere else, and allows the implementation strategy of: compute a result within a few ulps, taking care to avoid underflows in intermediate computations, then force an underflow exception if that result was subnormal. Only fully-defined functions such as fma need to take greater care about the exact underflow threshold (including its dependence on whether the architecture is before-rounding or after-rounding, and on the rounding mode on after-rounding architectures). (If the rounding mode is changed as part of the computation, it's still necessary to ensure that not just intermediate computations, but the final computation of the result to be returned, do not raise underflow if that result is the least normal value and underflow would be inconsistent with the original rounding mode. Since such code can readily discard exceptions as part of saving and restoring the rounding mode - SET_RESTORE_ROUND_NOEX etc. - I don't think that should be a problem in practice.) * manual/math.texi (Errors in Math Functions): Clarify goals regarding inexact and underflow exceptions.
* * manual/time.texi (TZ Variable): glibc no longer comes with tzdata.Paul Eggert2015-02-161-1/+2
| | | | Problem reported by J William Piggott.
* [BZ #17969]J William Piggott2015-02-121-2/+2
| | | | | * manual/time.texi (TZ Variable): The zoneinfo path is /usr/share/zoneinfo.
* Document tv_sec is of type time_t:Rüdiger Sonderfeld2015-02-121-2/+2
| | | | | | The tv_sec is of type time_t in both struct timeval and struct timespec. This matches the implementation and also the relevant standard (checked C11 for timespec and opengroup for timeval).
* glibc 2.21 pre-release update.Carlos O'Donell2015-02-052-2/+12
| | | | | | | | | | | | Update all translations. Update contributions in the manual. Update installation notes with information about newest working tools. Reconfigure using exactly autoconf 2.69. Regenerate INSTALL.
* Update copyright dates not handled by scripts/update-copyrights.Joseph Myers2015-01-021-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | I've updated copyright dates in glibc for 2015. This is the patch for the changes not generated by scripts/update-copyrights and subsequent build / regeneration of generated files. Apart from the files updated last time (of which sotruss.ksh had moved to sotruss.sh during the year) this also updates nptl/version.c (missed from 2006 until October) and sysdeps/unix/sysv/linux/lddlibc4.c (missed since 2009). * NEWS: Update copyright dates. * catgets/gencat.c (print_version): Likewise. * csu/version.c (banner): Likewise. * debug/catchsegv.sh: Likewise. * debug/pcprofiledump.c (print_version): Likewise. * debug/xtrace.sh (do_version): Likewise. * elf/ldconfig.c (print_version): Likewise. * elf/ldd.bash.in: Likewise. * elf/pldd.c (print_version): Likewise. * elf/sotruss.sh: Likewise. * elf/sprof.c (print_version): Likewise. * iconv/iconv_prog.c (print_version): Likewise. * iconv/iconvconfig.c (print_version): Likewise. * locale/programs/locale.c (print_version): Likewise. * locale/programs/localedef.c (print_version): Likewise. * login/programs/pt_chown.c (print_version): Likewise. * malloc/memusage.sh (do_version): Likewise. * malloc/memusagestat.c (print_version): Likewise. * malloc/mtrace.pl: Likewise. * manual/libc.texinfo: Likewise. * nptl/version.c (banner): Likewise. * nscd/nscd.c (print_version): Likewise. * nss/getent.c (print_version): Likewise. * nss/makedb.c (print_version): Likewise. * posix/getconf.c (main): Likewise. * scripts/test-installation.pl: Likewise. * sysdeps/unix/sysv/linux/lddlibc4.c (main): Likewise.
* Update copyright dates with scripts/update-copyrights.Joseph Myers2015-01-0247-47/+47
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* Require bison 2.7 or newer for regenerating intl/plural.yWill Newton2014-12-221-0/+9
| | | | | | | | | | | | | | | | | | | The merge of the latest gettext code introduced changes to the yacc parser source that are incompatible with versions of bison older than 2.7. Add a configure check for the appropriate versions and document the requirement in INSTALL. ChangeLog: 2014-12-22 Will Newton <will.newton@linaro.org> * manual/install.texi: Document that we require bison 2.7 or above. * INSTALL: Regenerate. * configure.ac: Use AC_CHECK_PROG_VER instead of AC_PATH_PROG when checking for bison and check for version 2.7 or above. * configure: Regenerate.
* manual: Correct guarantee about pointers compared by qsort()Anders Kaseorg2014-12-211-6/+8
| | | | | | | C99, C11, POSIX, and the glibc implementation do guarantee that the pointers passed to the qsort comparison function lie within the array. Signed-off-by: Anders Kaseorg <andersk@mit.edu>
* Bump required version of texinfo to 4.7Will Newton2014-12-151-1/+1
| | | | | | | | | | | | | | | It seems we require texinfo 4.7 for the --plaintext option, so document that and check for the correct version in configure. ChangeLog: 2014-12-15 Will Newton <will.newton@linaro.org> * manual/install.texi: Bump required version of texinfo to 4.7 from 4.5. * INSTALL: Regenerated. * configure.ac: Check for makeinfo version 4.7 and above. * configure: Regenerated.
* manual: Remove incorrect claim that qsort() can be stabilizedAnders Kaseorg2014-12-101-5/+4
| | | | | | | | | | | | Under certain conditions on the size of the array and its items, qsort() may fall back to an in-place quicksort if it cannot allocate memory for a temporary array with malloc(). This algorithm is not a stable sort even if the comparison function is written in the described manner. Fixes #10672. Signed-off-by: Anders Kaseorg <andersk@mit.edu>
* Use -Werror by default, add --disable-werror.Joseph Myers2014-12-101-0/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | As discussed starting at <https://sourceware.org/ml/libc-alpha/2014-11/msg00323.html>, this patch makes the glibc build use -Werror by default to avoid accidentally adding new warnings to the build. The configure option --disable-werror can be used to disable this. -Wno-error=undef is temporarily used because the build isn't clean regarding -Wundef warnings. The idea is that once the remaining -Wundef warnings have been cleaned up (in at least one configuration), -Wno-error=undef will be removed. I get a clean build and test on x86_64 (GCC 4.9 branch) with this patch. The expectation is that this may well break the build for some other configurations, and people seeing such breakage should make appropriate fixes to fix or suppress the warnings for their configurations. In some cases that may involve using pragmas as the right fix (I think that will be right for the -Wno-inline issue for MIPS I referred to in <https://sourceware.org/ml/libc-alpha/2012-11/msg00798.html>, for example), in some cases -Wno-error in sysdeps makefiles (__restore_rt in MIPS sigaction, for example), in some cases substantive fixes for the warnings. Note that if, with a view to listing all the warnings then fixing them all, you just look for "warning:" in output from building and testing with --disable-werror, you'll see lots of warnings from the linker about functions such as tmpnam. Those warnings can be ignored - only compiler warnings are relevant to -Werror, not linker warnings. * configure.ac (--disable-werror): New configure option. (enable_werror): New AC_SUBST. * configure: Regenerated. * config.make.in (enable-werror): New variable. * Makeconfig [$(enable-werror) = yes] (+gccwarn): Add -Werror -Wno-error=undef. (+gccwarn-c): Do not use -Werror=implicit-function-declaration. * manual/install.texi (Configuring and compiling): Document --disable-werror. * INSTALL: Regenerated. * debug/Makefile (CFLAGS-tst-chk1.c): Add -Wno-error. (CFLAGS-tst-chk2.c): Likewise. (CFLAGS-tst-chk3.c): Likewise. (CFLAGS-tst-chk4.cc): Likewise. (CFLAGS-tst-chk5.cc): Likewise. (CFLAGS-tst-chk6.cc): Likewise. (CFLAGS-tst-lfschk1.c): Likewise. (CFLAGS-tst-lfschk2.c): Likewise. (CFLAGS-tst-lfschk3.c): Likewise. (CFLAGS-tst-lfschk4.cc): Likewise. (CFLAGS-tst-lfschk5.cc): Likewise. (CFLAGS-tst-lfschk6.cc): Likewise.
* manual: fix addmntent's MT-Safety race annotationMa Shimiao2014-11-211-1/+1
| | | | | | | for ChangeLog * manual/sysinfo.texi (addmntent): It is actually MT-Safe, because the potential race is on the user-supplied stream.
* ctermid: return string literal, document MT-Safety pitfallAlexandre Oliva2014-11-211-3/+5
| | | | | | | | | | for ChangeLog * sysdeps/posix/ctermid.c (ctermid): Return a pointer to a string literal if not passed a buffer. * manual/job.texi (ctermid): Update reasoning, note deviation from posix, suggest mtasurace when not passed a buffer, for future non-preliminary safety notes.
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