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/* Quagga library initialise/closedown -- functions
* Copyright (C) 2009 Chris Hall (GMCH), Highwayman
*
* This file is part of GNU Zebra.
*
* GNU Zebra is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation; either version 2, or (at your
* option) any later version.
*
* GNU Zebra is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Zebra; see the file COPYING. If not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "misc.h"
#include <errno.h>
#include <stdio.h>
#include <sys/stat.h>
#include "qlib_init.h"
#include "zassert.h"
#include "memory.h"
#include "qpnexus.h"
#include "qpthreads.h"
#include "qpselect.h"
#include "thread.h"
#include "privs.h"
#include "mqueue.h"
#include "pthread_safe.h"
#include "log_local.h"
#include "qiovec.h"
/*==============================================================================
* Quagga Library Initialise/Closedown
*
* This gathers together the essential initialisation and closedown for the
* library. This ensures that any changes in the library are contained here,
* and do not require changes in all users of the library.
*
* There are two stages of initialisation:
*
* 1) first stage
*
* this is expected to be called before the program does anything at all.
*
* Collects a small number of useful system parameters -- see below.
*
* This performs all initialisation required to support asserts, logging,
* basic I/O (but not the remote console), trap signals... and so on.
*
* After this has been done, the system is in good shape to deal with
* command line options, configuration files and so on.
*
* 2) second stage
*
* this is expected to be called before the program does any serious work.
*
* This performs all initialisation required to support socket I/O,
* thread handling, timers, and so on.
*
* NB: at this stage the system is set into pthread mode, if required.
*
* No pthreads may be started before this. Up to this point
* the system operates in non-pthread mode -- all mutexes are
* implicitly free.
*
* There is one stage of closedown. This is expected to be called last, and
* is passed the exit code.
*
*==============================================================================
* System parameters:
*
*/
int qlib_iov_max ; /* _SC_IOV_MAX */
int qlib_open_max ; /* _SC_OPEN_MAX */
int qlib_pagesize ; /* _SC_PAGE_SIZE */
int qlib_thread_cputime ; /* _SC_THREAD_CPUTIME */
struct
{
int* p_var ;
int sc ;
const char* name ;
long min ;
long max ;
} qlib_vars[] =
{
{ .p_var = &qlib_iov_max, .sc = _SC_IOV_MAX,
.name = "_SC_IOV_MAX",
.min = 16, .max = INT_MAX },
{ .p_var = &qlib_open_max, .sc = _SC_OPEN_MAX,
.name = "_SC_OPEN_MAX",
.min = 256, .max = INT_MAX },
{ .p_var = &qlib_pagesize, .sc = _SC_PAGESIZE,
.name = "_SC_PAGESIZE",
.min = 256, .max = (INT_MAX >> 1) + 1 },
{ .p_var = &qlib_thread_cputime, .sc = _SC_THREAD_CPUTIME,
.name = "_SC_THREAD_CPUTIME",
.min = -1, .max = INT_MAX },
{ .p_var = NULL }
} ;
/*------------------------------------------------------------------------------
* First stage initialisation.
*
* Required for all users of the quagga library, whether running pthreaded or
* not.
*
* Should be absolutely the first action -- other than, perhaps, saying hello
* on stderr or the like.
*
*
*/
extern void
qlib_init_first_stage(mode_t cmask)
{
int i ;
/* Set umask at a very early stage, if required.
*/
if (cmask != 0)
umask(cmask) ;
/* Fetch the system parameters per the table above
*/
for (i = 0 ; qlib_vars[i].p_var != NULL ; ++i)
{
long val ;
errno = 0 ;
val = sysconf(qlib_vars[i].sc) ;
if (val == -1)
{
if (errno == 0)
val = INT_MAX ;
else
{
fprintf(stderr, "Failed to sysconf(%s): %s\n",
qlib_vars[i].name, errtoa(errno, 0).str) ;
exit(1) ;
} ;
} ;
if ((val < qlib_vars[i].min) || (val > qlib_vars[i].max))
{
fprintf(stderr, "sysconf(%s) = %ld: which is < %ld or > %ld\n",
qlib_vars[i].name, val, qlib_vars[i].min, qlib_vars[i].max) ;
exit(1) ;
} ;
*(qlib_vars[i].p_var) = (int)val ;
} ;
/* Initialise as required.
*
* NB: memory is the first to be initialised, and the last to be shut down.
*/
memory_start_up(qlib_pagesize) ;
qps_start_up() ;
qiovec_start_up(qlib_iov_max) ;
thread_start_up();
qpt_start_up(qlib_thread_cputime) ;
qpn_wd_start_up() ;
} ;
/*------------------------------------------------------------------------------
* Second stage initialisation.
*
* At this point we know whether will run pthreaded, and that is set for the
* duration, followed by any further initialisation that depends on knowing
* the pthreaded-ness.
*
* This is done fairly late during start up, after any configuration has been
* read which may choose whether to run pthreaded or not.
*
* Not required for daemons that do not use any of the newer facilities, but
* is recommended.
*/
extern void
qlib_init_second_stage(bool pthreaded)
{
qpt_set_qpthreads_enabled(pthreaded);
memory_init_r();
qpn_init() ;
thread_init_r();
log_init_r() ;
zprivs_init_r();
mqueue_initialise();
safe_init_r();
}
/*------------------------------------------------------------------------------
* Shut down
*
* NB: at this point it is assumed that all pthreads other than the main pthread
* have stopped.
*
* NB: memory is the last thing to be shut down, and if the given
* "mem_stats_name" is not NULL, will spew out information about any
* memory that has not been freed to stderr !
*/
extern void
qexit(int exit_code, bool mem_stats)
{
qpt_clear_qpthreads_active() ;
safe_finish();
mqueue_finish();
zprivs_finish();
log_finish();
thread_finish();
memory_finish(mem_stats);
exit (exit_code);
}
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