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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | NOTES | EXAMPLES | SEE ALSO | COLOPHON |
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GET_PHYS_PAGES(3) Linux Programmer's Manual GET_PHYS_PAGES(3)
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.
ENOSYS The system could not provide the required information
(possibly because the /proc filesystem was not mounted).
These functions are GNU extensions.
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);
}
sysconf(3)
This page is part of release 5.13 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 2021-03-22 GET_PHYS_PAGES(3)
Pages that refer to this page: undocumented(3)
Copyright and license for this manual page
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