get_phys_pages - Online Linux Manual PageSection : 3
Updated : 2022-10-30
Source : Linux man-pages 6.03
NAMEget_phys_pages, get_avphys_pages − get total and available physical page counts
LIBRARYStandard C library (libc, −lc)
SYNOPSIS#include <sys/sysinfo.h>"long get_phys_pages(void);
long get_avphys_pages(void);
DESCRIPTIONThe 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 VALUEOn success, these functions return a nonnegative value as given in DESCRIPTION. On failure, they return −1 and set errno to indicate the error.
ERRORSENOSYS The system could not provide the required information (possibly because the /proc filesystem was not mounted).
STANDARDSThese functions are GNU extensions.
NOTESBefore 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 */
EXAMPLESThe 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(void)
{
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 ALSOsysconf(3) 0
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