NAME

       get_phys_pages, get_avphys_pages - get total and available physical page counts

LIBRARY

       Standard C library (libc, -lc)

SYNOPSIS

       #include <sys/sysinfo.h>

       long get_phys_pages(void);
       long 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 error.

ERRORS

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

STANDARDS

       GNU.

HISTORY

       Before  glibc  2.23,  these  functions  obtained  the required information by scanning the
       MemTotal and MemFree fields of /proc/meminfo.  Since glibc 2.23,  these  functions  obtain
       the required information by calling sysinfo(2).

NOTES

       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 */

EXAMPLES

       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(void)
       {
           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)