undocumented(3) [posix man page]

UNDOCUMENTED(3) 					     Linux Programmer's Manual						   UNDOCUMENTED(3)

NAME

       undocumented - undocumented library functions

SYNOPSIS

       Undocumented library functions

DESCRIPTION

       This man page mentions those library functions which are implemented in the standard libraries but not yet documented in man pages.

   Solicitation
       If you have information about these functions, please look in the source code, write a man page (using a style similar to that of the other
       Linux section 3 man pages), and send it to mtk.manpages@gmail.com for inclusion in the next man page release.

   The list
       authdes_create(3), authdes_getucred(3), authdes_pk_create(3),  clntunix_create(3),  creat64(3),	dn_skipname(3),  fcrypt(3),  fp_nquery(3),
       fp_query(3),  fp_resstat(3),  freading(3),  freopen64(3),  fseeko64(3),	ftello64(3),  ftw64(3), fwscanf(3), get_avphys_pages(3), getdiren-
       tries64(3), getmsg(3), getnetname(3), get_phys_pages(3), getpublickey(3),  getsecretkey(3),  h_errlist(3),  host2netname(3),  hostalias(3),
       inet_nsap_addr(3),    inet_nsap_ntoa(3),    init_des(3),   libc_nls_init(3),   mstats(3),   netname2host(3),   netname2user(3),	 nlist(3),
       obstack_free(3), parse_printf_format(3), p_cdname(3),  p_cdnname(3),  p_class(3),  p_fqname(3),	p_option(3),  p_query(3),  printf_size(3),
       printf_size_info(3),   p_rr(3),	 p_time(3),  p_type(3),  putlong(3),  putshort(3),  re_compile_fastmap(3),  re_compile_pattern(3),  regis-
       ter_printf_function(3), re_match(3), re_match_2(3), re_rx_search(3), re_search(3), re_search_2(3),  re_set_registers(3),  re_set_syntax(3),
       res_send_setqhook(3),  res_send_setrhook(3),  ruserpass(3),  setfileno(3),  sethostfile(3),  svc_exit(3),  svcudp_enablecache(3),  tell(3),
       tr_break(3), tzsetwall(3), ufc_dofinalperm(3), ufc_doit(3), user2netname(3),  wcschrnul(3),  wcsftime(3),  wscanf(3),  xdr_authdes_cred(3),
       xdr_authdes_verf(3), xdr_cryptkeyarg(3), xdr_cryptkeyres(3), xdr_datum(3), xdr_des_block(3), xdr_domainname(3), xdr_getcredres(3), xdr_key-
       buf(3), xdr_keystatus(3), xdr_mapname(3), xdr_netnamestr(3), xdr_netobj(3), xdr_passwd(3), xdr_peername(3),  xdr_rmtcall_args(3),  xdr_rmt-
       callres(3),   xdr_unixcred(3),	xdr_yp_buf(3),	 xdr_yp_inaddr(3),   xdr_ypbind_binding(3),   xdr_ypbind_resp(3),  xdr_ypbind_resptype(3),
       xdr_ypbind_setdom(3), xdr_ypdelete_args(3), xdr_ypmaplist(3), xdr_ypmaplist_str(3), xdr_yppasswd(3), xdr_ypreq_key(3),  xdr_ypreq_nokey(3),
       xdr_ypresp_all(3),   xdr_ypresp_all_seq(3),   xdr_ypresp_key_val(3),   xdr_ypresp_maplist(3),   xdr_ypresp_master(3),  xdr_ypresp_order(3),
       xdr_ypresp_val(3), xdr_ypstat(3), xdr_ypupdate_args(3),	yp_all(3),  yp_bind(3),  yperr_string(3),  yp_first(3),  yp_get_default_domain(3),
       yp_maplist(3), yp_master(3), yp_match(3), yp_next(3), yp_order(3), ypprot_err(3), yp_unbind(3), yp_update(3)

COLOPHON

       This  page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

Linux								    2017-09-15							   UNDOCUMENTED(3)

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

NAME

       get_phys_pages, get_avphys_pages - get total and available physical page counts

SYNOPSIS

       #include <sys/sysinfo.h>

       long int get_phys_pages(void);
       long int 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
       cause of the error.

ERRORS

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

CONFORMING TO

       These functions are GNU extensions.

NOTES

       These functions obtain the required information by scanning the MemTotal and MemFree fields of /proc/meminfo.

       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 */

EXAMPLE

       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.
",
                   get_phys_pages(), get_avphys_pages());
           exit(EXIT_SUCCESS);
       }

SEE ALSO

       sysconf(3)

COLOPHON

       This page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and  the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

GNU                                                                 2017-09-15                                                   GET_PHYS_PAGES(3)