source/profile/profile.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 1.9.
   4    store smbd profiling information in shared memory
   5    Copyright (C) Andrew Tridgell 1999
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20
  21 */
  22
  23 #include "includes.h"
  24
  25 extern int DEBUGLEVEL;
  26
  27 #define IPC_PERMS ((SHM_R | SHM_W) | (SHM_R>>3) | (SHM_R>>6))
  28
  29 static int shm_id;
  30 static BOOL read_only;
  31
  32 struct profile_header *profile_h;
  33 struct profile_stats *profile_p;
  34
  35 BOOL do_profile_flag = False;
  36 BOOL do_profile_times = False;
  37
  38 struct timeval profile_starttime;
  39 struct timeval profile_endtime;
  40 struct timeval profile_starttime_nested;
  41 struct timeval profile_endtime_nested;
  42
  43 /****************************************************************************
  44 receive a set profile level message
  45 ****************************************************************************/
  46 void profile_message(int msg_type, pid_t src, void *buf, size_t len)
  47 {
  48         int level;
  49
  50         memcpy(&level, buf, sizeof(int));
  51         switch (level) {
  52         case 0:         /* turn off profiling */
  53                 do_profile_flag = False;
  54                 do_profile_times = False;
  55                 DEBUG(1,("INFO: Profiling turned OFF from pid %d\n", (int)src));
  56                 break;
  57         case 1:         /* turn on counter profiling only */
  58                 do_profile_flag = True;
  59                 do_profile_times = False;
  60                 DEBUG(1,("INFO: Profiling counts turned ON from pid %d\n", (int)src));
  61                 break;
  62         case 2:         /* turn on complete profiling */
  63                 do_profile_flag = True;
  64                 do_profile_times = True;
  65                 DEBUG(1,("INFO: Full profiling turned ON from pid %d\n", (int)src));
  66                 break;
  67         case 3:         /* reset profile values */
  68                 memset((char *)profile_p, 0, sizeof(*profile_p));
  69                 DEBUG(1,("INFO: Profiling values cleared from pid %d\n", (int)src));
  70                 break;
  71         }
  72 }
  73
  74 /****************************************************************************
  75 receive a request profile level message
  76 ****************************************************************************/
  77 void reqprofile_message(int msg_type, pid_t src, void *buf, size_t len)
  78 {
  79         int level;
  80
  81 #ifdef WITH_PROFILE
  82         level = 1 + (do_profile_flag?2:0) + (do_profile_times?4:0);
  83 #else
  84         level = 0;
  85 #endif
  86         DEBUG(1,("INFO: Received REQ_PROFILELEVEL message from PID %u\n",(unsigned int)src));
  87         message_send_pid(src, MSG_PROFILELEVEL, &level, sizeof(int), True);
  88 }
  89
  90 /*******************************************************************
  91   open the profiling shared memory area
  92   ******************************************************************/
  93 BOOL profile_setup(BOOL rdonly)
  94 {
  95         struct shmid_ds shm_ds;
  96
  97         read_only = rdonly;
  98
  99  again:
 100         /* try to use an existing key */
 101         shm_id = shmget(PROF_SHMEM_KEY, 0, 0);
 102
 103         /* if that failed then create one. There is a race condition here
 104            if we are running from inetd. Bad luck. */
 105         if (shm_id == -1) {
 106                 if (read_only) return False;
 107                 shm_id = shmget(PROF_SHMEM_KEY, sizeof(*profile_h),
 108                                 IPC_CREAT | IPC_EXCL | IPC_PERMS);
 109         }
 110
 111         if (shm_id == -1) {
 112                 DEBUG(0,("Can't create or use IPC area. Error was %s\n",
 113                          strerror(errno)));
 114                 return False;
 115         }
 116
 117
 118         profile_h = (struct profile_header *)shmat(shm_id, 0,
 119                                                    read_only?SHM_RDONLY:0);
 120         if ((long)profile_p == -1) {
 121                 DEBUG(0,("Can't attach to IPC area. Error was %s\n",
 122                          strerror(errno)));
 123                 return False;
 124         }
 125
 126         /* find out who created this memory area */
 127         if (shmctl(shm_id, IPC_STAT, &shm_ds) != 0) {
 128                 DEBUG(0,("ERROR shmctl : can't IPC_STAT. Error was %s\n",
 129                          strerror(errno)));
 130                 return False;
 131         }
 132
 133         if (shm_ds.shm_perm.cuid != 0 || shm_ds.shm_perm.cgid != 0) {
 134                 DEBUG(0,("ERROR: root did not create the shmem\n"));
 135                 return False;
 136         }
 137
 138         if (shm_ds.shm_segsz != sizeof(*profile_h)) {
 139                 DEBUG(0,("WARNING: profile size is %d (expected %d). Deleting\n",
 140                          (int)shm_ds.shm_segsz, sizeof(*profile_h)));
 141                 if (shmctl(shm_id, IPC_RMID, &shm_ds) == 0) {
 142                         goto again;
 143                 } else {
 144                         return False;
 145                 }
 146         }
 147
 148         if (!read_only && (shm_ds.shm_nattch == 1)) {
 149                 memset((char *)profile_h, 0, sizeof(*profile_h));
 150                 profile_h->prof_shm_magic = PROF_SHM_MAGIC;
 151                 profile_h->prof_shm_version = PROF_SHM_VERSION;
 152                 DEBUG(3,("Initialised profile area\n"));
 153         }
 154
 155         profile_p = &profile_h->stats;
 156         message_register(MSG_PROFILE, profile_message);
 157         message_register(MSG_REQ_PROFILELEVEL, reqprofile_message);
 158         return True;
 159 }
 160