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 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 avail- able 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 MemTo- tal 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)
COLOPHON
This page is part of release 4.16 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/.
GNU 2017-09-15 GET_PHYS_PAGES(3)