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 #include <sys/shm.h>
  26
  27 extern int DEBUGLEVEL;
  28
  29 #define IPC_PERMS ((SHM_R | SHM_W) | (SHM_R>>3) | (SHM_R>>6))
  30
  31 static int shm_id;
  32 static BOOL read_only;
  33
  34 struct profile_header *profile_h;
  35 struct profile_stats *profile_p;
  36
  37 BOOL do_profile_flag = False;
  38 BOOL do_profile_times = False;
  39
  40 struct timeval profile_starttime;
  41 struct timeval profile_endtime;
  42 struct timeval profile_starttime_nested;
  43 struct timeval profile_endtime_nested;
  44
  45 /****************************************************************************
  46 receive a set profile level message
  47 ****************************************************************************/
  48 void profile_message(int msg_type, pid_t src, void *buf, size_t len)
  49 {
  50         int level;
  51
  52         memcpy(&level, buf, sizeof(int));
  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 }
  75
  76 /****************************************************************************
  77 receive a request profile level message
  78 ****************************************************************************/
  79 void reqprofile_message(int msg_type, pid_t src, void *buf, size_t len)
  80 {
  81         int level;
  82
  83 #ifdef WITH_PROFILE
  84         level = 1 + (do_profile_flag?2:0) + (do_profile_times?4:0);
  85 #else
  86         level = 0;
  87 #endif
  88         DEBUG(1,("INFO: Received REQ_PROFILELEVEL message from PID %d\n",src));
  89         message_send_pid(src, MSG_PROFILELEVEL, &level, sizeof(int), True);
  90 }
  91
  92 /*******************************************************************
  93   open the profiling shared memory area
  94   ******************************************************************/
  95 BOOL profile_setup(BOOL rdonly)
  96 {
  97         struct shmid_ds shm_ds;
  98
  99         read_only = rdonly;
 100
 101  again:
 102         /* try to use an existing key */
 103         shm_id = shmget(PROF_SHMEM_KEY, 0, 0);
 104
 105         /* if that failed then create one. There is a race condition here
 106            if we are running from inetd. Bad luck. */
 107         if (shm_id == -1) {
 108                 if (read_only) return False;
 109                 shm_id = shmget(PROF_SHMEM_KEY, sizeof(*profile_h),
 110                                 IPC_CREAT | IPC_EXCL | IPC_PERMS);
 111         }
 112
 113         if (shm_id == -1) {
 114                 DEBUG(0,("Can't create or use IPC area. Error was %s\n",
 115                          strerror(errno)));
 116                 return False;
 117         }
 118
 119
 120         profile_h = (struct profile_header *)shmat(shm_id, 0,
 121                                                    read_only?SHM_RDONLY:0);
 122         if ((long)profile_p == -1) {
 123                 DEBUG(0,("Can't attach to IPC area. Error was %s\n",
 124                          strerror(errno)));
 125                 return False;
 126         }
 127
 128         /* find out who created this memory area */
 129         if (shmctl(shm_id, IPC_STAT, &shm_ds) != 0) {
 130                 DEBUG(0,("ERROR shmctl : can't IPC_STAT. Error was %s\n",
 131                          strerror(errno)));
 132                 return False;
 133         }
 134
 135         if (shm_ds.shm_perm.cuid != 0 || shm_ds.shm_perm.cgid != 0) {
 136                 DEBUG(0,("ERROR: root did not create the shmem\n"));
 137                 return False;
 138         }
 139
 140         if (shm_ds.shm_segsz != sizeof(*profile_h)) {
 141                 DEBUG(0,("WARNING: profile size is %d (expected %d). Deleting\n",
 142                          (int)shm_ds.shm_segsz, sizeof(*profile_h)));
 143                 if (shmctl(shm_id, IPC_RMID, &shm_ds) == 0) {
 144                         goto again;
 145                 } else {
 146                         return False;
 147                 }
 148         }
 149
 150         if (!read_only && (shm_ds.shm_nattch == 1)) {
 151                 memset((char *)profile_h, 0, sizeof(*profile_h));
 152                 profile_h->prof_shm_magic = PROF_SHM_MAGIC;
 153                 profile_h->prof_shm_version = PROF_SHM_VERSION;
 154                 DEBUG(3,("Initialised profile area\n"));
 155         }
 156
 157         profile_p = &profile_h->stats;
 158         message_register(MSG_PROFILE, profile_message);
 159         message_register(MSG_REQ_PROFILELEVEL, reqprofile_message);
 160         return True;
 161 }
 162