Name
get_phys_pages, get_avphys_pages - get total and available physical page countsLibrary
Standard C library ( libc ", " -lc )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).
Standards
GNU.History
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). Notes
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(void) { printf("This system has %ld pages of physical memory and " "%ld pages of physical memory available.\en", get_phys_pages(), get_avphys_pages()); exit(EXIT_SUCCESS); }
See Also
- sysconf(3)