получить общее и доступное количество физических страниц (get total and available physical page counts)
Имя (Name)
get_phys_pages, get_avphys_pages - get total and available
physical page counts
Синопсис (Synopsis)
#include <sys/sysinfo.h>
long get_phys_pages(void);
long get_avphys_pages(void);
Описание (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.
Возвращаемое значение (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.
Ошибки (Error)
ENOSYS The system could not provide the required information
(possibly because the /proc filesystem was not mounted).
Стандарты (Conforming to)
These functions are GNU extensions.
Примечание (Note)
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 */
Примеры (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(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);
}
Смотри также (See also)
sysconf(3)
