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 #ifdef WITH_PROFILE
  26 #define IPC_PERMS ((SHM_R | SHM_W) | (SHM_R>>3) | (SHM_R>>6))
  27 #endif /* WITH_PROFILE */
  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 #ifdef WITH_PROFILE
  52         switch (level) {
  53         case 0:         /* turn off profiling */
  54                 do_profile_flag = False;
  55                 do_profile_times = False;
  56                 DEBUG(1,("INFO: Profiling turned OFF from pid %d\n", (int)src));
  57                 break;
  58         case 1:         /* turn on counter profiling only */
  59                 do_profile_flag = True;
  60                 do_profile_times = False;
  61                 DEBUG(1,("INFO: Profiling counts turned ON from pid %d\n", (int)src));
  62                 break;
  63         case 2:         /* turn on complete profiling */
  64                 do_profile_flag = True;
  65                 do_profile_times = True;
  66                 DEBUG(1,("INFO: Full profiling turned ON from pid %d\n", (int)src));
  67                 break;
  68         case 3:         /* reset profile values */
  69                 memset((char *)profile_p, 0, sizeof(*profile_p));
  70                 DEBUG(1,("INFO: Profiling values cleared from pid %d\n", (int)src));
  71                 break;
  72         }
  73 #else /* ndef WITH_PROFILE */
  74         DEBUG(1,("INFO: Profiling support unavailable in this build.\n"));
  75 #endif /* WITH_PROFILE */
  76 }
  77
  78 /****************************************************************************
  79 receive a request profile level message
  80 ****************************************************************************/
  81 void reqprofile_message(int msg_type, pid_t src, void *buf, size_t len)
  82 {
  83         int level;
  84
  85 #ifdef WITH_PROFILE
  86         level = 1 + (do_profile_flag?2:0) + (do_profile_times?4:0);
  87 #else
  88         level = 0;
  89 #endif
  90         DEBUG(1,("INFO: Received REQ_PROFILELEVEL message from PID %u\n",(unsigned int)src));
  91         message_send_pid(src, MSG_PROFILELEVEL, &level, sizeof(int), True);
  92 }
  93
  94 /*******************************************************************
  95   open the profiling shared memory area
  96   ******************************************************************/
  97
  98 #ifdef WITH_PROFILE
  99 BOOL profile_setup(BOOL rdonly)
 100 {
 101         struct shmid_ds shm_ds;
 102
 103         read_only = rdonly;
 104
 105  again:
 106         /* try to use an existing key */
 107         shm_id = shmget(PROF_SHMEM_KEY, 0, 0);
 108
 109         /* if that failed then create one. There is a race condition here
 110            if we are running from inetd. Bad luck. */
 111         if (shm_id == -1) {
 112                 if (read_only) return False;
 113                 shm_id = shmget(PROF_SHMEM_KEY, sizeof(*profile_h),
 114                                 IPC_CREAT | IPC_EXCL | IPC_PERMS);
 115         }
 116
 117         if (shm_id == -1) {
 118                 DEBUG(0,("Can't create or use IPC area. Error was %s\n",
 119                          strerror(errno)));
 120                 return False;
 121         }
 122
 123
 124         profile_h = (struct profile_header *)shmat(shm_id, 0,
 125                                                    read_only?SHM_RDONLY:0);
 126         if ((long)profile_p == -1) {
 127                 DEBUG(0,("Can't attach to IPC area. Error was %s\n",
 128                          strerror(errno)));
 129                 return False;
 130         }
 131
 132         /* find out who created this memory area */
 133         if (shmctl(shm_id, IPC_STAT, &shm_ds) != 0) {
 134                 DEBUG(0,("ERROR shmctl : can't IPC_STAT. Error was %s\n",
 135                          strerror(errno)));
 136                 return False;
 137         }
 138
 139 #if 0
 140         if (shm_ds.shm_perm.cuid != 0 || shm_ds.shm_perm.cgid != 0) {
 141                 DEBUG(0,("ERROR: root did not create the shmem\n"));
 142                 return False;
 143         }
 144 #endif
 145
 146         if (shm_ds.shm_segsz != sizeof(*profile_h)) {
 147                 DEBUG(0,("WARNING: profile size is %d (expected %d). Deleting\n",
 148                          (int)shm_ds.shm_segsz, sizeof(*profile_h)));
 149                 if (shmctl(shm_id, IPC_RMID, &shm_ds) == 0) {
 150                         goto again;
 151                 } else {
 152                         return False;
 153                 }
 154         }
 155
 156         if (!read_only && (shm_ds.shm_nattch == 1)) {
 157                 memset((char *)profile_h, 0, sizeof(*profile_h));
 158                 profile_h->prof_shm_magic = PROF_SHM_MAGIC;
 159                 profile_h->prof_shm_version = PROF_SHM_VERSION;
 160                 DEBUG(3,("Initialised profile area\n"));
 161         }
 162
 163         profile_p = &profile_h->stats;
 164         message_register(MSG_PROFILE, profile_message);
 165         message_register(MSG_REQ_PROFILELEVEL, reqprofile_message);
 166         return True;
 167 }
 168 #endif /* WITH_PROFILE */