Huge difference between _POSIX_OPEN_MAX and sysconf(_SC_OPEN

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LEARN ABOUT MINIX

getpagesize

getpagesize(3C)                                            Standard C Library Functions                                            getpagesize(3C)

NAME

       getpagesize - get system page size

SYNOPSIS

       #include <unistd.h>

       int getpagesize(void);

DESCRIPTION

       The  getpagesize()  function  returns  the  number of bytes in a page. Page granularity is the granularity of many of the memory management
       calls.

       The page size is a system page size and need not be the same as the underlying hardware page size.

       The getpagesize() function is equivalent to sysconf(_SC_PAGE_SIZE) and sysconf(_SC_PAGESIZE). See sysconf(3C).

RETURN VALUES

       The getpagesize() function returns the current page size.

ERRORS

       No errors are defined.

USAGE

       The value returned by getpagesize() need not be the minimum value that malloc(3C) can allocate.  Moreover, the  application  cannot  assume
       that an object of this size can be allocated with malloc().

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |MT-Level                     |MT-Safe                      |
       +-----------------------------+-----------------------------+

SEE ALSO

       pagesize(1), brk(2), getrlimit(2), mmap(2), mprotect(2), munmap(2), malloc(3C), msync(3C), sysconf(3C), attributes(5)

SunOS 5.10                                                          27 Jun 2000                                                    getpagesize(3C)