get_phys_pages

GET_PHYS_PAGES(3)          Linux Programmer's Manual         GET_PHYS_PAGES(3)

NAME
       get_phys_pages,  get_avphys_pages  -  get  total and available physical
       page counts

SYNOPSIS
       #include <sys/sysinfo.h>

       long int get_phys_pages(void);
       long int get_avphys_pages(void);

DESCRIPTION
       The function get_phys_pages() returns  the  total  number  of  physical
       pages of memory available on the system.

       The  function get_avphys_pages() returns the number of currently avail-
       able physical pages of memory on the system.

RETURN VALUE
       On success, these functions return a nonnegative value as given in  DE-
       SCRIPTION.   On  failure,  they return -1 and set errno to indicate the
       cause of the error.

ERRORS
       ENOSYS The system could not provide the required information  (possibly
              because the /proc filesystem was not mounted).

CONFORMING TO
       These functions are GNU extensions.

NOTES
       These  functions obtain the required information by scanning the MemTo-
       tal and MemFree fields of /proc/meminfo.

       The following sysconf(3) calls provide a portable  means  of  obtaining
       the same information as the functions described on this page.

           total_pages = sysconf(_SC_PHYS_PAGES);    /* total pages */
           avl_pages = sysconf(_SC_AVPHYS_PAGES);    /* available pages */

EXAMPLE
       The following example shows how get_phys_pages() and get_avphys_pages()
       can be used.

       #include <stdio.h>
       #include <stdlib.h>
       #include <sys/sysinfo.h>

       int
       main(int argc, char *argv[])
       {
           printf("This system has %ld pages of physical memory and "
                   "%ld pages of physical memory available.\n",
                   get_phys_pages(), get_avphys_pages());
           exit(EXIT_SUCCESS);
       }

SEE ALSO
       sysconf(3)

COLOPHON
       This page is part of release 5.05 of the Linux  man-pages  project.   A
       description  of  the project, information about reporting bugs, and the
       latest    version    of    this    page,    can     be     found     at
       https://www.kernel.org/doc/man-pages/.

GNU                               2019-03-06                 GET_PHYS_PAGES(3)