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glibc

The GNU C library.

Other Activity This Week

Add new script for plotting string benchmark JSON output
Krzysztof Koch: Add a script for visualizing the JSON output generated by existing glibc string microbenchmarks. Overview: plot_strings.py is capable of plotting benchmark results in the following formats, which are controlled with the -p or --plot argument: 1.

Recent Activity

Add new script for plotting string benchmark JSON output
Krzysztof Koch: Add a script for visualizing the JSON output generated by existing glibc string microbenchmarks. Overview: plot_strings.py is capable of plotting benchmark results in the following formats, which are controlled with the -p or --plot argument: 1.

login: Acquire write lock early in pututline [BZ #24882]
Florian Weimer: It has been reported that due to lack of fairness in POSIX file locking, the current reader-to-writer lock upgrade can result in lack of forward progress.

Refactor nanosleep in terms of clock_nanosleep
Adhemerval Zanella: The generic version is straightforward.

nptl: Move nanosleep implementation to libc
Adhemerval Zanella: Checked on x86_64-linux-gnu and powerpc64le-linux-gnu.

y2038: linux: Provide __utimensat64 implementation
Lukasz Majewski: This patch provides new __utimensat64 explicit 64 bit function for setting access and modification time of a file.

nptl: Replace non cancellable pause/nanosleep with futex
Adhemerval Zanella: To help y2038 work avoid duplicate all the logic of nanosleep on non cancellable version, the patch replace it with a new futex operation, lll_timedwait.

Revise the documentation of simple calendar time
Zack Weinberg: This is a thorough revision of all the material relating to the functions time, stime, gettimeofday, settimeofday, clock_gettime, clock_getres, clock_settime, and difftime, spilling over into the discussion of time-related data types (which now get their own section) and touching the adjtime family as well (which deserves its own thorough revision, but I'd have to do a bunch of research first). Substantive changes are: - Document clock_gettime, clock_getres, and clock_settime.

Use clock_gettime to implement gettimeofday
Adhemerval Zanella: Consolidate generic gettimeofday implementation to use clock_gettime.

Use clock_gettime to implement timespec_get
Zack Weinberg: timespec_get is the same function as clock_gettime, with an obnoxious coating of NIH painted on it by the ISO C committee.

Consolidate and deprecate ftime
Zack Weinberg: ftime is an obsolete variation on gettimeofday, offering only millisecond time resolution; it was probably a system call in ooold versions of BSD Unix.

glibc Release Tags

[MIPS] Raise highest supported EI_ABIVERSION value [BZ #24916]
Mihailo Stojanovic: This bumps the highest valid EI_ABIVERSION value to ABSOLUTE ABI. New testcase loads the symbol from the GOT with the "lb" instruction so that the EI_ABIVERSION header field of the shared object is set to ABSOLUTE (it doesn't actually check the value of the symbol), and makes sure that the main executable is executed without "ABI version invalid" error. Tested for all three ABIs (o32, n32, n64) using both static linker which handles undefined weak symbols correctly [1] (and sets the EI_ABIVERSION of the test module) and the one that doesn't (EI_ABIVERSION left as 0). [1]

Open master for 2.31 development
Carlos O'Donell

Tag 2.30 release
Carlos O'Donell

Update install and NEWS for 2.30 release
Carlos O'Donell

Replace PREPARE_VERSION macro with inline function
Tobias Klauser: - sysdeps/unix/sysv/linux/dl-vdso.h (PREPARE_VERSION): Remove macro.

Add missing VDSO_{NAME,HASH}_* macros and use them for PREPARE_VERSION_KNOWN
Tobias Klauser: Define all currently used Linux versions used for PREPARE_VERSION{,_KNOWN} in sysdeps/unix/sysv/linux/dl-vdso.h and use them instead of duplicating the versions and precomputed hashes across architecture specific files. - sysdeps/unix/sysv/linux/aarch64/gettimeofday.c (INIT_ARCH): Use PREPARE_VERSION_KNOWN. - sysdeps/unix/sysv/linux/aarch64/init-first.c: Likewise. - sysdeps/unix/sysv/linux/dl-vdso.h (VDSO_NAME_LINUX_2_6_39): New define.

Open master for 2.30 development
Siddhesh Poyarekar

Open master branch for glibc 2.29 development
Carlos O'Donell

Update for 2.25 release
Siddhesh Poyarekar

Update version.h and include/features.h for 2.22 release
Carlos O'Donell

Most Popular In The Past Month

S390: Add new s390 platform z15.
Stefan Liebler: The new IBM z15 is added to platform string array.

Add nocancel version of pread64()
Leandro Pereira: This is in preparation for changes in the dynamic linker so that pread() is used instead of lseek()+read().

nptl: SIGCANCEL, SIGTIMER, SIGSETXID are always defined
Florian Weimer: All nptl targets have these signal definitions nowadays.

Use clock_gettime to implement gettimeofday
Adhemerval Zanella: Consolidate generic gettimeofday implementation to use clock_gettime.

Use clock_settime to implement settimeofday
Zack Weinberg: Unconditionally, on all ports, use clock_settime to implement settimeofday.

Fix testroot.pristine creation copying dynamic linker
Joseph Myers: This patch addresses an issue reported in <

Consolidate and deprecate ftime
Zack Weinberg: ftime is an obsolete variation on gettimeofday, offering only millisecond time resolution; it was probably a system call in ooold versions of BSD Unix.

Use clock_gettime to implement timespec_get
Zack Weinberg: timespec_get is the same function as clock_gettime, with an obnoxious coating of NIH painted on it by the ISO C committee.

Use clock_gettime to implement time
Adhemerval Zanella: Change the default implementation of time to call clock_gettime, to align with new Linux ports that are expected to only implement __NR_clock_gettime.

Revise the documentation of simple calendar time
Zack Weinberg: This is a thorough revision of all the material relating to the functions time, stime, gettimeofday, settimeofday, clock_gettime, clock_getres, clock_settime, and difftime, spilling over into the discussion of time-related data types (which now get their own section) and touching the adjtime family as well (which deserves its own thorough revision, but I'd have to do a bunch of research first). Substantive changes are: - Document clock_gettime, clock_getres, and clock_settime.

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