get_phys_pages
Section: C Library Functions (3)
Updated: 2022-10-30
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NAME
get_phys_pages, get_avphys_pages - get total and available physical
page counts
LIBRARY
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
These functions are GNU extensions.
NOTES
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 */
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.\n",
get_phys_pages(), get_avphys_pages());
exit(EXIT_SUCCESS);
}
SEE ALSO
sysconf(3)
Index
- NAME
-
- LIBRARY
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- STANDARDS
-
- NOTES
-
- EXAMPLES
-
- SEE ALSO
-
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