mirror of
https://github.com/samba-team/samba.git
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9a846daf44
fixed - an mmaped file or the like would be a good idea.
(This used to be commit bc1385fc5e
)
161 lines
4.8 KiB
C
161 lines
4.8 KiB
C
/*
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Unix SMB/Netbios implementation.
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Version 1.9.
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store smbd profiling information in shared memory
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Copyright (C) Andrew Tridgell 1999
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "includes.h"
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extern int DEBUGLEVEL;
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#define IPC_PERMS ((SHM_R | SHM_W) | (SHM_R>>3) | (SHM_R>>6))
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static int shm_id;
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static BOOL read_only;
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struct profile_header *profile_h;
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struct profile_stats *profile_p;
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BOOL do_profile_flag = False;
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BOOL do_profile_times = False;
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struct timeval profile_starttime;
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struct timeval profile_endtime;
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struct timeval profile_starttime_nested;
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struct timeval profile_endtime_nested;
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/****************************************************************************
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receive a set profile level message
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****************************************************************************/
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void profile_message(int msg_type, pid_t src, void *buf, size_t len)
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{
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int level;
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memcpy(&level, buf, sizeof(int));
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switch (level) {
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case 0: /* turn off profiling */
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do_profile_flag = False;
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do_profile_times = False;
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DEBUG(1,("INFO: Profiling turned OFF from pid %d\n", (int)src));
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break;
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case 1: /* turn on counter profiling only */
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do_profile_flag = True;
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do_profile_times = False;
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DEBUG(1,("INFO: Profiling counts turned ON from pid %d\n", (int)src));
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break;
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case 2: /* turn on complete profiling */
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do_profile_flag = True;
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do_profile_times = True;
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DEBUG(1,("INFO: Full profiling turned ON from pid %d\n", (int)src));
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break;
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case 3: /* reset profile values */
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memset((char *)profile_p, 0, sizeof(*profile_p));
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DEBUG(1,("INFO: Profiling values cleared from pid %d\n", (int)src));
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break;
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}
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}
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/****************************************************************************
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receive a request profile level message
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****************************************************************************/
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void reqprofile_message(int msg_type, pid_t src, void *buf, size_t len)
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{
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int level;
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#ifdef WITH_PROFILE
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level = 1 + (do_profile_flag?2:0) + (do_profile_times?4:0);
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#else
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level = 0;
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#endif
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DEBUG(1,("INFO: Received REQ_PROFILELEVEL message from PID %u\n",(unsigned int)src));
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message_send_pid(src, MSG_PROFILELEVEL, &level, sizeof(int), True);
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}
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/*******************************************************************
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open the profiling shared memory area
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******************************************************************/
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BOOL profile_setup(BOOL rdonly)
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{
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struct shmid_ds shm_ds;
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read_only = rdonly;
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again:
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/* try to use an existing key */
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shm_id = shmget(PROF_SHMEM_KEY, 0, 0);
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/* if that failed then create one. There is a race condition here
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if we are running from inetd. Bad luck. */
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if (shm_id == -1) {
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if (read_only) return False;
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shm_id = shmget(PROF_SHMEM_KEY, sizeof(*profile_h),
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IPC_CREAT | IPC_EXCL | IPC_PERMS);
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}
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if (shm_id == -1) {
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DEBUG(0,("Can't create or use IPC area. Error was %s\n",
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strerror(errno)));
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return False;
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}
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profile_h = (struct profile_header *)shmat(shm_id, 0,
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read_only?SHM_RDONLY:0);
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if ((long)profile_p == -1) {
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DEBUG(0,("Can't attach to IPC area. Error was %s\n",
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strerror(errno)));
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return False;
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}
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/* find out who created this memory area */
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if (shmctl(shm_id, IPC_STAT, &shm_ds) != 0) {
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DEBUG(0,("ERROR shmctl : can't IPC_STAT. Error was %s\n",
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strerror(errno)));
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return False;
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}
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if (shm_ds.shm_perm.cuid != sec_initial_uid() || shm_ds.shm_perm.cgid != sec_initial_gid()) {
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DEBUG(0,("ERROR: we did not create the shmem (owned by another user)\n"));
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return False;
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}
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if (shm_ds.shm_segsz != sizeof(*profile_h)) {
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DEBUG(0,("WARNING: profile size is %d (expected %d). Deleting\n",
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(int)shm_ds.shm_segsz, sizeof(*profile_h)));
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if (shmctl(shm_id, IPC_RMID, &shm_ds) == 0) {
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goto again;
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} else {
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return False;
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}
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}
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if (!read_only && (shm_ds.shm_nattch == 1)) {
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memset((char *)profile_h, 0, sizeof(*profile_h));
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profile_h->prof_shm_magic = PROF_SHM_MAGIC;
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profile_h->prof_shm_version = PROF_SHM_VERSION;
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DEBUG(3,("Initialised profile area\n"));
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}
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profile_p = &profile_h->stats;
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message_register(MSG_PROFILE, profile_message);
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message_register(MSG_REQ_PROFILELEVEL, reqprofile_message);
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return True;
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}
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