r2: import HEAD into svn+ssh://svn.samba.org/home/svn/samba/trunk

metze

1 files changed, 166 insertions, 0 deletions

diff --git a/source/profile/profile.c b/source/profile/profile.c
new file mode 100644
index 00000000000..689f67da997
--- /dev/null
+++ b/source/profile/profile.c
@@ -0,0 +1,166 @@
+/* 
+   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 ((SHM_R | SHM_W) | (SHM_R>>3) | (SHM_R>>6))
+#endif /* WITH_PROFILE */
+
+#ifdef WITH_PROFILE
+static int shm_id;
+static BOOL read_only;
+#endif
+
+struct profile_header *profile_h;
+struct profile_stats *profile_p;
+
+BOOL do_profile_flag = False;
+BOOL do_profile_times = False;
+
+struct timeval profile_starttime;
+struct timeval profile_endtime;
+struct timeval profile_starttime_nested;
+struct timeval profile_endtime_nested;
+
+/****************************************************************************
+receive a set profile level message
+****************************************************************************/
+void profile_message(int msg_type, pid_t 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)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)src));
+		break;
+	case 2:		/* turn on complete profiling */
+		do_profile_flag = True;
+		do_profile_times = True;
+		DEBUG(1,("INFO: Full profiling turned ON from pid %d\n", (int)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)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, pid_t 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)src));
+	message_send_pid(src, MSG_PROFILELEVEL, &level, sizeof(int), True);
+}
+
+/*******************************************************************
+  open the profiling shared memory area
+  ******************************************************************/
+#ifdef WITH_PROFILE
+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_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)\n"));
+		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 */