/*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
- *
- * @APPLE_LICENSE_HEADER_START@
- *
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License"). You may not use this file except in compliance with the
- * License. Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
- *
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * Copyright (c) 2015 Apple Inc. All rights reserved.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ *
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
- * License for the specific language governing rights and limitations
- * under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
- */
-/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
-/*
- * Copyright (c) 1988, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * @(#)ktrace.h 8.1 (Berkeley) 6/2/93
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
-#ifndef _SYS_KTRACE_H_
-#define _SYS_KTRACE_H_
+#ifndef SYS_KTRACE_H
+#define SYS_KTRACE_H
-/*
- * operations to ktrace system call (KTROP(op))
- */
-#define KTROP_SET 0 /* set trace points */
-#define KTROP_CLEAR 1 /* clear trace points */
-#define KTROP_CLEARFILE 2 /* stop all tracing to file */
-#define KTROP(o) ((o)&3) /* macro to extract operation */
-/*
- * flags (ORed in with operation)
- */
-#define KTRFLAG_DESCEND 4 /* perform op on all children too */
+#include <stdint.h>
-/*
- * ktrace record header
- */
-struct ktr_header {
- int ktr_len; /* length of buf */
- short ktr_type; /* trace record type */
- pid_t ktr_pid; /* process id */
- char ktr_comm[MAXCOMLEN+1]; /* command name */
- struct timeval ktr_time; /* timestamp */
- caddr_t ktr_buf;
+#include <kern/locks.h>
+
+/* The states that ktrace can be in. */
+enum ktrace_state {
+ /* No tool has configured ktrace. */
+ KTRACE_STATE_OFF = 0,
+ /* A foreground tool has configured ktrace. */
+ KTRACE_STATE_FG,
+ /* A background tool has configured ktrace. */
+ KTRACE_STATE_BG
};
-/*
- * Test for kernel trace point
- */
-#define KTRPOINT(p, type) \
- (((p)->p_traceflag & ((1<<(type))|KTRFAC_ACTIVE)) == (1<<(type)))
+void ktrace_lock(void);
+void ktrace_unlock(void);
+void ktrace_assert_lock_held(void);
+void ktrace_start_single_threaded(void);
+void ktrace_end_single_threaded(void);
/*
- * ktrace record types
+ * Subsystems that use ktrace to manage ownership. These values are passed as
+ * part of the `*_mask` arguments in `ktrace_configure` and `ktrace_reset`.
*/
+#define KTRACE_KDEBUG (1 << 0)
+#define KTRACE_KPERF (1 << 1)
/*
- * KTR_SYSCALL - system call record
+ * Used by subsystems to inform ktrace that a configuration is occurring.
+ * Validates whether the current process has privileges to configure
+ * ktrace. Pass the subsystem(s) being configured in config_mask.
+ *
+ * `ktrace_lock` must be held.
+ *
+ * Returns 0 if configuration is allowed, EPERM if process is not privileged,
+ * and EBUSY if ktrace is owned by another process.
*/
-#define KTR_SYSCALL 1
-struct ktr_syscall {
- int ktr_code; /* syscall number */
- int ktr_argsize; /* size of arguments */
- /*
- * followed by ktr_argsize/sizeof(register_t) "register_t"s
- */
-};
+int ktrace_configure(uint32_t config_mask);
/*
- * KTR_SYSRET - return from system call record
+ * Tell ktrace to reset a configuration. Pass the susbsystem(s) that are to
+ * be reset in the reset_mask.
+ *
+ * `ktrace_lock` must be held.
*/
-#define KTR_SYSRET 2
-struct ktr_sysret {
- short ktr_code;
- short ktr_eosys;
- int ktr_error;
- int ktr_retval;
-};
+void ktrace_reset(uint32_t reset_mask);
/*
- * KTR_NAMEI - namei record
+ * Determine if the current process can read the configuration of ktrace.
+ * Only the owning process or a root privileged process is allowed.
+ *
+ * `ktrace_lock` must be held.
+ *
+ * Returns 0 if allowed, EPERM otherwise.
*/
-#define KTR_NAMEI 3
- /* record contains pathname */
+int ktrace_read_check(void);
/*
- * KTR_GENIO - trace generic process i/o
+ * With certain boot-args, the kernel can start tracing without user space
+ * intervention. With `trace=<n_events>`, the kernel will start tracing at
+ * boot. With `trace_wake=<n_events>`, the kernel will start tracing on the
+ * wake path out of hibernation (on Intel only).
+ *
+ * In these cases, ktrace must be aware of the state changes. This function
+ * should be called whenever the kernel initiates configuring ktrace.
+ *
+ * `ktrace_lock` must be held.
*/
-#define KTR_GENIO 4
-struct ktr_genio {
- int ktr_fd;
- enum uio_rw ktr_rw;
- /*
- * followed by data successfully read/written
- */
-};
+void ktrace_kernel_configure(uint32_t config_mask);
/*
- * KTR_PSIG - trace processed signal
+ * This KPI allows kernel systems to disable ktrace. ktrace will only be
+ * disabled if the state matches the provided state_to_match.
+ *
+ * This does not reset the configuration of any subsystems -- it just makes
+ * them stop logging events or sampling data.
+ *
+ * `ktrace_lock` must be held.
*/
-#define KTR_PSIG 5
-struct ktr_psig {
- int signo;
- sig_t action;
- int mask;
- int code;
-};
+void ktrace_disable(enum ktrace_state state_to_match);
/*
- * KTR_CSW - trace context switches
+ * Returns the pid of the process that owns ktrace. If ktrace is unowned,
+ * returns 0.
+ *
+ * `ktrace_lock` must be held.
*/
-#define KTR_CSW 6
-struct ktr_csw {
- int out; /* 1 if switch out, 0 if switch in */
- int user; /* 1 if usermode (ivcsw), 0 if kernel (vcsw) */
-};
+int ktrace_get_owning_pid(void);
/*
- * kernel trace points (in p_traceflag)
+ * Returns true if background tracing is active, false otherwise.
+ *
+ * `ktrace_lock` must be held.
*/
-#define KTRFAC_MASK 0x00ffffff
-#define KTRFAC_SYSCALL (1<<KTR_SYSCALL)
-#define KTRFAC_SYSRET (1<<KTR_SYSRET)
-#define KTRFAC_NAMEI (1<<KTR_NAMEI)
-#define KTRFAC_GENIO (1<<KTR_GENIO)
-#define KTRFAC_PSIG (1<<KTR_PSIG)
-#define KTRFAC_CSW (1<<KTR_CSW)
+bool ktrace_background_active(void);
+
/*
- * trace flags (also in p_traceflags)
+ * These functions exist for the transition for kperf to allow blessing other
+ * processes. They should not be used by other clients.
*/
-#define KTRFAC_ROOT 0x80000000 /* root set this trace */
-#define KTRFAC_INHERIT 0x40000000 /* pass trace flags to children */
-#define KTRFAC_ACTIVE 0x20000000 /* ktrace logging in progress, ignore */
-
-#ifndef KERNEL
-
-#include <sys/cdefs.h>
-
-__BEGIN_DECLS
-int ktrace __P((const char *, int, int, pid_t));
-__END_DECLS
+extern bool ktrace_keep_ownership_on_reset;
+extern int ktrace_root_set_owner_allowed;
+int ktrace_set_owning_pid(int pid);
-#endif /* !KERNEL */
-#endif /* !_SYS_KTRACE_H_ */
+/* Initialize ktrace. Must only be called by the bootstrap thread. */
+void ktrace_init(void);
+#endif /* SYS_KTRACE_H */
projects / apple / xnu.git / blobdiff