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 available physical pages of memory on the system.

RETURN VALUE

       On  success,  these functions return a nonnegative value as given in DESCRIPTION.  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 MemTotal 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.
",
                   get_phys_pages(), get_avphys_pages());
           exit(EXIT_SUCCESS);
       }

SEE ALSO

       sysconf(3)

COLOPHON

       This page is part of release 4.15 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                                                                 2017-09-15                                                   GET_PHYS_PAGES(3)