Just following up on my previous message, here's the updated
page. If you think it's ready for addition, I'll submit the patch for
it tonight.
.\" Copyright (c) 2015 William Woodruff (william@xxxxxxxxxxxx)
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.TH GET_PHYS_PAGES 3 2015-03-02 "GNU" "Linux Programmer's Manual"
.SH NAME
get_phys_pages, get_avphys_pages \- get total and available physical
page counts
.SH SYNOPSIS
.nf
.B "#include <sys/sysinfo.h>"
.sp
.B long int get_phys_pages(void);
.B long int get_av_phys_pages(void);
.SH DESCRIPTION
The function
.BR get_phys_pages ()
returns the total number of physical pages of memory available on the
system.
The function
.BR get_avphys_pages ()
returns the number of available physical pages of memory available on the
system.
.SH RETURN VALUE
On success, these functions return a nonnegative value as given in
DESCRIPTION.
On failure, they return \-1 and set
.I errno
to indicate the cause of the error.
.SH ERRORS
.TP
.B ENOSYS
The system could not provide the required information
(possibly because the
.I /proc
filesystem was not mounted).
.SH CONFORMING TO
These functions are GNU extensions.
.SH NOTES
These functions obtain the required information by scanning the
.I MemTotal
and
.I MemFree
fields of
.IR /proc/meminfo .
The following
.BR sysconf (3)
calls provide a portable means of obtaining the same information as the
functions described on this page.
.nf
total_pages = sysconf(_SC_PHYS_PAGES); /* total pages */
avl_pages = sysconf(_SC_AVPHYS_PAGES); /* available pages */
.fi
.SH EXAMPLE
The following example shows how
.BR get_phys_pages ()
and
.BR get_avphys_pages ()
can be used.
.nf
#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);
}
.fi
.SH SEE ALSO
.BR sysconf (3)
Best,
William
On 05/04/2015 09:58 AM, William Woodruff wrote:
> Hi Michael, William,
>
> On 05/04/2015 09:52 AM, Michael Kerrisk (man-pages) wrote:
>> Hi William,
>>
>> On 05/04/2015 02:58 PM, J William Piggott wrote:
>>> On 05/04/2015 04:08 AM, Michael Kerrisk (man-pages) wrote:
>>>> Hello William,
>>>>
>>>> On 05/03/2015 11:06 PM, William Woodruff wrote:
>>>
>>>
>>>>> returns the total number of physical pages of memory available on the
>>>>> system.
>>>>> .sp
>>>>
>>>> No need for .sp here. Just use a blank line for the para break.
>>>
>>> This is Groff specific behavior. From roff(7):
>>> · Never include empty or blank lines in a roff document.
>>
>> I'm not sure whether that text applies or not. But in any case,
>> we've got hundreds of pages that happily use blank lines.
>> If you mist, you can instead use ".PP", but ".sp" seems
>> wrong to me.
>
> I'll follow your advice here. I've seen the rule about never using
> blank lines in groff, but if other pages do it, I'll assume the behavior
> is reasonable.
>
> Best,
> William Woodruff
>
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