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); |
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.
On success, these functions return a nonnegative value as
given in DESCRIPTION. On failure, they return −1 and
set errno to indicate the
error.
The system could not provide the required
information (possibly because the /proc filesystem was not
mounted).
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).
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 */
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);
}
This page is part of release 5.11 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/.
|
Copyright (c) 2015 William Woodruff (williamtuffbizz.com) %%%LICENSE_START(VERBATIM) Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. Since the Linux kernel and libraries are constantly changing, this manual page may be incorrect or out-of-date. The author(s) assume no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein. The author(s) may not have taken the same level of care in the production of this manual, which is licensed free of charge, as they might when working professionally. Formatted or processed versions of this manual, if unaccompanied by the source, must acknowledge the copyright and authors of this work. %%%LICENSE_END |