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/*
Unix SMB/CIFS implementation.
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 ((S_IRUSR | S_IWUSR) | S_IRGRP | S_IROTH)
#endif /* WITH_PROFILE */
#ifdef WITH_PROFILE
static int shm_id;
static BOOL read_only;
#if defined(HAVE_CLOCK_GETTIME)
clockid_t __profile_clock;
BOOL have_profiling_clock = False;
#endif
#endif
struct profile_header *profile_h;
struct profile_stats *profile_p;
BOOL do_profile_flag = False;
BOOL do_profile_times = False;
/****************************************************************************
receive a set profile level message
****************************************************************************/
void profile_message(int msg_type, struct process_id 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)procid_to_pid(&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)procid_to_pid(&src)));
break;
case 2: /* turn on complete profiling */
#if defined(HAVE_CLOCK_GETTIME)
if (!have_profiling_clock) {
do_profile_flag = True;
do_profile_times = False;
DEBUG(1,("INFO: Profiling counts turned ON from "
"pid %d\n", (int)procid_to_pid(&src)));
DEBUGADD(1,("INFO: Profiling times disabled "
"due to lack of a suitable clock\n"));
break;
}
#endif
do_profile_flag = True;
do_profile_times = True;
DEBUG(1,("INFO: Full profiling turned ON from pid %d\n",
(int)procid_to_pid(&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)procid_to_pid(&src)));
break;
}
#else /* 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, struct process_id 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)procid_to_pid(&src)));
message_send_pid(src, MSG_PROFILELEVEL, &level, sizeof(int), True);
}
/*******************************************************************
open the profiling shared memory area
******************************************************************/
#ifdef WITH_PROFILE
#ifdef HAVE_CLOCK_GETTIME
/* Find a clock. Just because the definition for a particular clock ID is
* present doesn't mean the system actually supports it.
*/
static void init_clock_gettime(void)
{
struct timespec ts;
have_profiling_clock = False;
#ifdef HAVE_CLOCK_PROCESS_CPUTIME_ID
/* CLOCK_PROCESS_CPUTIME_ID is sufficiently fast that the
* always profiling times is plausible. Unfortunately on Linux
* it is only accurate if we can guarantee we will not be scheduled
* scheduled onto a different CPU between samples. Until there is
* some way to set processor affinity, we can only use this on
* uniprocessors.
*/
if (!this_is_smp()) {
if (clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts) == 0) {
DEBUG(10, ("Using CLOCK_PROCESS_CPUTIME_ID "
"for profile_clock\n"));
__profile_clock = CLOCK_PROCESS_CPUTIME_ID;
have_profiling_clock = True;
}
}
#endif
#ifdef HAVE_CLOCK_MONOTONIC
if (!have_profiling_clock &&
clock_gettime(CLOCK_MONOTONIC, &ts) == 0) {
DEBUG(10, ("Using CLOCK_MONOTONIC for profile_clock\n"));
__profile_clock = CLOCK_MONOTONIC;
have_profiling_clock = True;
return;
}
#endif
#ifdef HAVE_CLOCK_REALTIME
/* POSIX says that CLOCK_REALTIME should be defined everywhere
* where we have clock_gettime...
*/
if (!have_profiling_clock &&
clock_gettime(CLOCK_REALTIME, &ts) == 0) {
__profile_clock = CLOCK_REALTIME;
have_profiling_clock = True;
}
SMB_WARN(__profile_clock == CLOCK_REALTIME,
("Using (slow) CLOCK_REALTIME for profile_clock"));
#endif
SMB_WARN(have_profiling_clock == False,
("could not find a working clock for profiling"));
return have_profiling_clock;
}
#endif
BOOL profile_setup(BOOL rdonly)
{
struct shmid_ds shm_ds;
read_only = rdonly;
#ifdef HAVE_CLOCK_GETTIME
init_clock_gettime();
#endif
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 (shm_ds.shm_perm.cuid != sec_initial_uid() ||
shm_ds.shm_perm.cgid != sec_initial_gid()) {
DEBUG(0,("ERROR: we did not create the shmem "
"(owned by another user, uid %u, gid %u)\n",
shm_ds.shm_perm.cuid,
shm_ds.shm_perm.cgid));
return False;
}
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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