get_phys_pages (3) - Linux Manuals
get_phys_pages: get total and available physical
get_phys_pages, get_avphys_pages - get total and available physical page counts
#include <sys/sysinfo.h> long get_phys_pages(void); long get_avphys_pages(void);
DESCRIPTIONThe 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 VALUEOn 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.
- The system could not provide the required information (possibly because the /proc filesystem was not mounted).
CONFORMING TOThese functions are GNU extensions.
NOTESThese 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 */
EXAMPLESThe following example shows how get_phys_pages() and get_avphys_pages() can be used.
#include <stdio.h> #include <stdlib.h> #include <sys/sysinfo.h>
main(int argc, char *argv)
COLOPHONThis page is part of release 5.10 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/.