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)

Linux man-pages 6.7                                2023-10-31                                  get_phys_pages(3)