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13.115.16 getpagesize ¶

LSB specification:
https://refspecs.linuxbase.org/LSB_5.0.0/LSB-Core-generic/LSB-Core-generic/baselib-getpagesize.html

Documentation:

• https://www.gnu.org/software/libc/manual/html_node/Query-Memory-Parameters.html,
• man getpagesize.

Gnulib module: getpagesize

Portability problems fixed by Gnulib:

• This function is missing on some platforms: MSVC 14, Android 4.4.
• This function is not declared on some platforms: HP-UX 11 with compiler option -D_XOPEN_SOURCE=600.
• This function is broken on some platforms: mingw.

Portability problems not fixed by Gnulib:

• The function has never been in POSIX and was removed from the Single UNIX Specification in SUSv3 (2001). Although portable programs are supposed to use sysconf (_SC_PAGESIZE) instead, in practice getpagesize can be a little faster.
• On typical platforms this function’s API limits page sizes to at most 1 GiB, even though sysconf (_SC_PAGESIZE) does not have this limitation. However, this has not been a practical problem yet, and so many programs use getpagesize that it’s unlikely that new platforms would introduce larger page sizes any time soon.