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/*
Unix SMB/Netbios implementation.
Version 1.9.
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
#include <sys/shm.h>
extern int DEBUGLEVEL;
#define IPC_PERMS ((SHM_R | SHM_W) | (SHM_R>>3) | (SHM_R>>6))
static int shm_id;
static BOOL read_only;
struct profile_struct *profile_p;
/*******************************************************************
open the profiling shared memory area
******************************************************************/
BOOL profile_setup(BOOL rdonly)
{
struct shmid_ds shm_ds;
read_only = rdonly;
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_p),
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_p = (struct profile_struct *)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 != 0 || shm_ds.shm_perm.cgid != 0) {
DEBUG(0,("ERROR: root did not create the shmem\n"));
return False;
}
if (shm_ds.shm_segsz != sizeof(*profile_p)) {
DEBUG(0,("WARNING: profile size is %d (expected %d). Deleting\n",
(int)shm_ds.shm_segsz, sizeof(*profile_p)));
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_p, 0, sizeof(*profile_p));
profile_p->prof_shm_magic = PROF_SHM_MAGIC;
profile_p->prof_shm_version = PROF_SHM_VERSION;
DEBUG(3,("Initialised profile area\n"));
}
return True;
}
#else
/* to keep compilers happy about empty modules */
void profile_dummy(void) {}
#endif
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