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profile.c

/* 
   Unix SMB/Netbios implementation.
   Version 1.9.
   store smbd profiling information in shared memory
   Copyright (C) Andrew Tridgell 1999
   
   This program 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 of the License, or
   (at your option) any later version.
   
   This program 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 this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#include "includes.h"

#ifdef WITH_PROFILE
#define IPC_PERMS ((SHM_R | SHM_W) | (SHM_R>>3) | (SHM_R>>6))
static int shm_id;
static BOOL read_only;

#endif /* WITH_PROFILE */

struct profile_header *profile_h;
struct profile_stats *profile_p;

BOOL do_profile_flag = False;
BOOL do_profile_times = False;

struct timeval profile_starttime;
struct timeval profile_endtime;
struct timeval profile_starttime_nested;
struct timeval profile_endtime_nested;

/****************************************************************************
receive a set profile level message
****************************************************************************/
void profile_message(int msg_type, pid_t src, void *buf, size_t len)
{
        int level;

      memcpy(&level, buf, sizeof(int));
#ifdef WITH_PROFILE
      switch (level) {
      case 0:           /* turn off profiling */
            do_profile_flag = False;
            do_profile_times = False;
            DEBUG(1,("INFO: Profiling turned OFF from pid %d\n", (int)src));
            break;
      case 1:           /* turn on counter profiling only */
            do_profile_flag = True;
            do_profile_times = False;
            DEBUG(1,("INFO: Profiling counts turned ON from pid %d\n", (int)src));
            break;
      case 2:           /* turn on complete profiling */
            do_profile_flag = True;
            do_profile_times = True;
            DEBUG(1,("INFO: Full profiling turned ON from pid %d\n", (int)src));
            break;
      case 3:           /* reset profile values */
            memset((char *)profile_p, 0, sizeof(*profile_p));
            DEBUG(1,("INFO: Profiling values cleared from pid %d\n", (int)src));
            break;
      }
#else /* ndef WITH_PROFILE */
      DEBUG(1,("INFO: Profiling support unavailable in this build.\n"));
#endif /* WITH_PROFILE */
}

/****************************************************************************
receive a request profile level message
****************************************************************************/
void reqprofile_message(int msg_type, pid_t src, void *buf, size_t len)
{
        int level;

#ifdef WITH_PROFILE
      level = 1 + (do_profile_flag?2:0) + (do_profile_times?4:0);
#else
      level = 0;
#endif
      DEBUG(1,("INFO: Received REQ_PROFILELEVEL message from PID %u\n",(unsigned int)src));
      message_send_pid(src, MSG_PROFILELEVEL, &level, sizeof(int), True);
}

/*******************************************************************
  open the profiling shared memory area
  ******************************************************************/

#ifdef WITH_PROFILE
BOOL profile_setup(BOOL rdonly)
{
      struct shmid_ds shm_ds;

      read_only = rdonly;

 again:
      /* try to use an existing key */
      shm_id = shmget(PROF_SHMEM_KEY, 0, 0);
      
      /* if that failed then create one. There is a race condition here
         if we are running from inetd. Bad luck. */
      if (shm_id == -1) {
            if (read_only) return False;
            shm_id = shmget(PROF_SHMEM_KEY, sizeof(*profile_h), 
                        IPC_CREAT | IPC_EXCL | IPC_PERMS);
      }
      
      if (shm_id == -1) {
            DEBUG(0,("Can't create or use IPC area. Error was %s\n", 
                   strerror(errno)));
            return False;
      }   
      
      
      profile_h = (struct profile_header *)shmat(shm_id, 0, 
                                       read_only?SHM_RDONLY:0);
      if ((long)profile_p == -1) {
            DEBUG(0,("Can't attach to IPC area. Error was %s\n", 
                   strerror(errno)));
            return False;
      }

      /* find out who created this memory area */
      if (shmctl(shm_id, IPC_STAT, &shm_ds) != 0) {
            DEBUG(0,("ERROR shmctl : can't IPC_STAT. Error was %s\n", 
                   strerror(errno)));
            return False;
      }

#if 0
      if (shm_ds.shm_perm.cuid != 0 || shm_ds.shm_perm.cgid != 0) {
            DEBUG(0,("ERROR: root did not create the shmem\n"));
            return False;
      }
#endif

      if (shm_ds.shm_segsz != sizeof(*profile_h)) {
            DEBUG(0,("WARNING: profile size is %d (expected %d). Deleting\n",
                   (int)shm_ds.shm_segsz, sizeof(*profile_h)));
            if (shmctl(shm_id, IPC_RMID, &shm_ds) == 0) {
                  goto again;
            } else {
                  return False;
            }
      }

      if (!read_only && (shm_ds.shm_nattch == 1)) {
            memset((char *)profile_h, 0, sizeof(*profile_h));
            profile_h->prof_shm_magic = PROF_SHM_MAGIC;
            profile_h->prof_shm_version = PROF_SHM_VERSION;
            DEBUG(3,("Initialised profile area\n"));
      }

      profile_p = &profile_h->stats;
      message_register(MSG_PROFILE, profile_message);
      message_register(MSG_REQ_PROFILELEVEL, reqprofile_message);
      return True;
}
#endif /* WITH_PROFILE */

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