source3/profile/profile.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    store smbd profiling information in shared memory
   4    Copyright (C) Andrew Tridgell 1999
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19
  20 */
  21
  22 #include "includes.h"
  23
  24 #ifdef WITH_PROFILE
  25 #define IPC_PERMS ((SHM_R | SHM_W) | (SHM_R>>3) | (SHM_R>>6))
  26 #endif /* WITH_PROFILE */
  27
  28 #ifdef WITH_PROFILE
  29 static int shm_id;
  30 static BOOL read_only;
  31 #endif
  32
  33 struct profile_header *profile_h;
  34 struct profile_stats *profile_p;
  35
  36 BOOL do_profile_flag = False;
  37 BOOL do_profile_times = False;
  38
  39 struct timeval profile_starttime;
  40 struct timeval profile_endtime;
  41 struct timeval profile_starttime_nested;
  42 struct timeval profile_endtime_nested;
  43
  44 /****************************************************************************
  45 receive a set profile level message
  46 ****************************************************************************/
  47 void profile_message(int msg_type, pid_t src, void *buf, size_t len)
  48 {
  49         int level;
  50
  51         memcpy(&level, buf, sizeof(int));
  52 #ifdef WITH_PROFILE
  53         switch (level) {
  54         case 0:         /* turn off profiling */
  55                 do_profile_flag = False;
  56                 do_profile_times = False;
  57                 DEBUG(1,("INFO: Profiling turned OFF from pid %d\n", (int)src));
  58                 break;
  59         case 1:         /* turn on counter profiling only */
  60                 do_profile_flag = True;
  61                 do_profile_times = False;
  62                 DEBUG(1,("INFO: Profiling counts turned ON from pid %d\n", (int)src));
  63                 break;
  64         case 2:         /* turn on complete profiling */
  65                 do_profile_flag = True;
  66                 do_profile_times = True;
  67                 DEBUG(1,("INFO: Full profiling turned ON from pid %d\n", (int)src));
  68                 break;
  69         case 3:         /* reset profile values */
  70                 memset((char *)profile_p, 0, sizeof(*profile_p));
  71                 DEBUG(1,("INFO: Profiling values cleared from pid %d\n", (int)src));
  72                 break;
  73         }
  74 #else /* WITH_PROFILE */
  75         DEBUG(1,("INFO: Profiling support unavailable in this build.\n"));
  76 #endif /* WITH_PROFILE */
  77 }
  78
  79 /****************************************************************************
  80 receive a request profile level message
  81 ****************************************************************************/
  82 void reqprofile_message(int msg_type, pid_t src, void *buf, size_t len)
  83 {
  84         int level;
  85
  86 #ifdef WITH_PROFILE
  87         level = 1 + (do_profile_flag?2:0) + (do_profile_times?4:0);
  88 #else
  89         level = 0;
  90 #endif
  91         DEBUG(1,("INFO: Received REQ_PROFILELEVEL message from PID %u\n",(unsigned int)src));
  92         message_send_pid(src, MSG_PROFILELEVEL, &level, sizeof(int), True);
  93 }
  94
  95 /*******************************************************************
  96   open the profiling shared memory area
  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 (shm_ds.shm_perm.cuid != sec_initial_uid() || shm_ds.shm_perm.cgid != sec_initial_gid()) {
 140                 DEBUG(0,("ERROR: we did not create the shmem (owned by another user)\n"));
 141                 return False;
 142         }
 143
 144         if (shm_ds.shm_segsz != sizeof(*profile_h)) {
 145                 DEBUG(0,("WARNING: profile size is %d (expected %d). Deleting\n",
 146                          (int)shm_ds.shm_segsz, sizeof(*profile_h)));
 147                 if (shmctl(shm_id, IPC_RMID, &shm_ds) == 0) {
 148                         goto again;
 149                 } else {
 150                         return False;
 151                 }
 152         }
 153
 154         if (!read_only && (shm_ds.shm_nattch == 1)) {
 155                 memset((char *)profile_h, 0, sizeof(*profile_h));
 156                 profile_h->prof_shm_magic = PROF_SHM_MAGIC;
 157                 profile_h->prof_shm_version = PROF_SHM_VERSION;
 158                 DEBUG(3,("Initialised profile area\n"));
 159         }
 160
 161         profile_p = &profile_h->stats;
 162         message_register(MSG_PROFILE, profile_message);
 163         message_register(MSG_REQ_PROFILELEVEL, reqprofile_message);
 164         return True;
 165 }
 166 #endif /* WITH_PROFILE */