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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 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).
CONFORMING TO
These functions are GNU extensions.
NOTES
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 func‐
tions obtain the required information by calling sysinfo(2).
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(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)
GNU 2021-03-22 GET_PHYS_PAGES(3)