User  |  Syst  |  Libr  |  Device  |  Files  |  Other  |  Admin  |  Head  |

---

   get_phys_pages    ( 3 )

---

---

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)

---