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glibc provides the functionality required by the Single UNIX Specification, POSIX (1c, 1d, and 1j) and some of the functionality required by ISO C11, ISO C99, Berkeley Unix (BSD) interfaces, the System V Interface Definition (SVID) and the X/Open Portability Guide (XPG), Issue 4.2, with all extensions common to XSI (X/Open System Interface ...
The new standard passed its final draft review on October 10, 2011 and was officially ratified by ISO and published as ISO/IEC 9899:2011 on December 8, 2011, with no comments requiring resolution by participating national bodies. A standard macro __STDC_VERSION__ is defined with value 201112L to indicate that C11 support is available. [5]
For example, glibc implements functions such as fork within libc.so, but before NPTL was merged into glibc it constituted a separate library with its own linker flag argument. Often, this POSIX-specified functionality will be regarded as part of the library; the basic C library may be identified as the ANSI or ISO C library.
C23, formally ISO/IEC 9899:2024, is the current open standard for the C programming language, which supersedes C17 (standard ISO/IEC 9899:2018). [1] It was started in 2016 informally as C2x, [2] and was published on October 31, 2024. [3] The freely available draft most similar to the one published is document N3220 [4] (see Available texts, below).
ISO/IEC TR 24731-1:2007, [18] on library extensions to support bounds-checked interfaces, integrated into C11 ISO/IEC TR 18037:2008, [ 19 ] on embedded C extensions ISO/IEC TR 24732:2009, [ 20 ] on decimal floating point arithmetic, superseded by ISO/IEC TS 18661-2:2015
C17, formally ISO/IEC 9899:2018, [1] is an open standard for the C programming language, prepared in 2017 and published in July 2018. It replaced C11 (standard ISO/IEC 9899:2011), [ 2 ] and is superseded by C23 (ISO/IEC 9899:2024) since October 2024. [ 3 ]
timespec_get (C11) returns a calendar time based on a time base Format conversions asctime: converts a struct tm object to a textual representation (deprecated) ctime: converts a time_t value to a textual representation strftime: converts a struct tm object to custom textual representation strptime: converts a string with time information to a ...
C11 added imaginary types (which were described in an informative annex of C99): float _Imaginary, double _Imaginary, long double _Imaginary. Including the header <complex.h> allows all these types to be accessed with using complex and imaginary respectively.