get_avphys_pages(3)

1GET_PHYS_PAGES(3)          Linux Programmer's Manual         GET_PHYS_PAGES(3)
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NAME

6       get_phys_pages,  get_avphys_pages  -  get  total and available physical
7       page counts
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SYNOPSIS

10       #include <sys/sysinfo.h>
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12       long int get_phys_pages(void);
13       long int get_avphys_pages(void);
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DESCRIPTION

16       The function get_phys_pages() returns  the  total  number  of  physical
17       pages of memory available on the system.
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19       The  function get_avphys_pages() returns the number of currently avail‐
20       able physical pages of memory on the system.
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RETURN VALUE

23       On success, these functions return a  nonnegative  value  as  given  in
24       DESCRIPTION.   On failure, they return -1 and set errno to indicate the
25       cause of the error.
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ERRORS

28       ENOSYS The system could not provide the required information  (possibly
29              because the /proc filesystem was not mounted).
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CONFORMING TO

32       These functions are GNU extensions.
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NOTES

35       These  functions obtain the required information by scanning the MemTo‐
36       tal and MemFree fields of /proc/meminfo.
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38       The following sysconf(3) calls provide a portable  means  of  obtaining
39       the same information as the functions described on this page.
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41           total_pages = sysconf(_SC_PHYS_PAGES);    /* total pages */
42           avl_pages = sysconf(_SC_AVPHYS_PAGES);    /* available pages */
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EXAMPLE

45       The following example shows how get_phys_pages() and get_avphys_pages()
46       can be used.
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48       #include <stdio.h>
49       #include <stdlib.h>
50       #include <sys/sysinfo.h>
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52       int
53       main(int argc, char *argv[])
54       {
55           printf("This system has %ld pages of physical memory and "
56                   "%ld pages of physical memory available.\n",
57                   get_phys_pages(), get_avphys_pages());
58           exit(EXIT_SUCCESS);
59       }
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COLOPHON

65       This page is part of release 5.04 of the Linux  man-pages  project.   A
66       description  of  the project, information about reporting bugs, and the
67       latest    version    of    this    page,    can     be     found     at
68       https://www.kernel.org/doc/man-pages/.
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72GNU                               2019-03-06                 GET_PHYS_PAGES(3)