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.\n", get_phys_pages(), get_avphys_pages()); exit(EXIT_SUCCESS); }

SEE ALSO

sysconf(3)

Information

Source
Linux kernel
OS/version
GNU
Source updated
September 15, 2017
Page created
February 9, 2018
Page generated
December 2, 2018