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    The following form allows you to view linux man pages.

    Command:

    getpagesize

    
    
    

    SYNOPSIS

           #include <unistd.h>
    
           int getpagesize(void);
    
       Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
    
           getpagesize():
               Since glibc 2.12:
                   _BSD_SOURCE ||
                       !(_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600)
               Before glibc 2.12:
                   _BSD_SOURCE || _XOPEN_SOURCE >= 500 ||
                   _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
    
    
    

    DESCRIPTION

           The function getpagesize() returns the number  of  bytes  in  a  memory
           page, where "page" is a fixed-length block, the unit for memory alloca-
           tion and file mapping performed by mmap(2).
    
    
    

    CONFORMING TO

           SVr4, 4.4BSD, SUSv2.   In  SUSv2  the  getpagesize()  call  is  labeled
           LEGACY,  and  in  POSIX.1-2001 it has been dropped; HP-UX does not have
           this call.
    
    
    

    NOTES

           Portable applications should employ  sysconf(_SC_PAGESIZE)  instead  of
           getpagesize():
    
               #include <unistd.h>
               long sz = sysconf(_SC_PAGESIZE);
    
           (Most systems allow the synonym _SC_PAGE_SIZE for _SC_PAGESIZE.)
    
           Whether  getpagesize() is present as a Linux system call depends on the
           architecture.  If it is, it returns the kernel symbol PAGE_SIZE,  whose
           value  depends  on  the architecture and machine model.  Generally, one
           uses binaries that are dependent on the architecture  but  not  on  the
           machine model, in order to have a single binary distribution per archi-
           tecture.  This means that a user program should not find  PAGE_SIZE  at
           compile  time  from  a  header  file, but use an actual system call, at
           least for those architectures (like sun4) where this dependency exists.
           Here libc4, libc5, glibc 2.0 fail because their getpagesize() returns a
           statically derived value, and does not use a system call.   Things  are
           OK in glibc 2.1.
    
    
    

    SEE ALSO

           mmap(2), sysconf(3)
    
    
    

    Linux 2010-11-16 GETPAGESIZE(2)

    
    
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