The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/ktrace.h

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    1 /*-
    2  * Copyright (c) 1988, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)ktrace.h    8.1 (Berkeley) 6/2/93
   30  * $FreeBSD: stable/9/sys/sys/ktrace.h 237719 2012-06-28 18:38:24Z jhb $
   31  */
   32 
   33 #ifndef _SYS_KTRACE_H_
   34 #define _SYS_KTRACE_H_
   35 
   36 /*
   37  * operations to ktrace system call  (KTROP(op))
   38  */
   39 #define KTROP_SET               0       /* set trace points */
   40 #define KTROP_CLEAR             1       /* clear trace points */
   41 #define KTROP_CLEARFILE         2       /* stop all tracing to file */
   42 #define KTROP(o)                ((o)&3) /* macro to extract operation */
   43 /*
   44  * flags (ORed in with operation)
   45  */
   46 #define KTRFLAG_DESCEND         4       /* perform op on all children too */
   47 
   48 /*
   49  * ktrace record header
   50  */
   51 struct ktr_header {
   52         int     ktr_len;                /* length of buf */
   53         short   ktr_type;               /* trace record type */
   54         pid_t   ktr_pid;                /* process id */
   55         char    ktr_comm[MAXCOMLEN + 1];/* command name */
   56         struct  timeval ktr_time;       /* timestamp */
   57         intptr_t        ktr_tid;        /* was ktr_buffer */
   58 };
   59 
   60 /*
   61  * Test for kernel trace point (MP SAFE).
   62  *
   63  * KTRCHECK() just checks that the type is enabled and is only for
   64  * internal use in the ktrace subsystem.  KTRPOINT() checks against
   65  * ktrace recursion as well as checking that the type is enabled and
   66  * is the public interface.
   67  */
   68 #define KTRCHECK(td, type)      ((td)->td_proc->p_traceflag & (1 << type))
   69 #define KTRPOINT(td, type)                                              \
   70         (KTRCHECK((td), (type)) && !((td)->td_pflags & TDP_INKTRACE))
   71 #define KTRCHECKDRAIN(td)       (!(STAILQ_EMPTY(&(td)->td_proc->p_ktr)))
   72 #define KTRUSERRET(td) do {                                             \
   73         if (KTRCHECKDRAIN(td))                                          \
   74                 ktruserret(td);                                         \
   75 } while (0)
   76 
   77 /*
   78  * ktrace record types
   79  */
   80 
   81 /*
   82  * KTR_SYSCALL - system call record
   83  */
   84 #define KTR_SYSCALL     1
   85 struct ktr_syscall {
   86         short   ktr_code;               /* syscall number */
   87         short   ktr_narg;               /* number of arguments */
   88         /*
   89          * followed by ktr_narg register_t
   90          */
   91         register_t      ktr_args[1];
   92 };
   93 
   94 /*
   95  * KTR_SYSRET - return from system call record
   96  */
   97 #define KTR_SYSRET      2
   98 struct ktr_sysret {
   99         short   ktr_code;
  100         short   ktr_eosys;
  101         int     ktr_error;
  102         register_t      ktr_retval;
  103 };
  104 
  105 /*
  106  * KTR_NAMEI - namei record
  107  */
  108 #define KTR_NAMEI       3
  109         /* record contains pathname */
  110 
  111 /*
  112  * KTR_GENIO - trace generic process i/o
  113  */
  114 #define KTR_GENIO       4
  115 struct ktr_genio {
  116         int     ktr_fd;
  117         enum    uio_rw ktr_rw;
  118         /*
  119          * followed by data successfully read/written
  120          */
  121 };
  122 
  123 /*
  124  * KTR_PSIG - trace processed signal
  125  */
  126 #define KTR_PSIG        5
  127 struct ktr_psig {
  128         int     signo;
  129         sig_t   action;
  130         int     code;
  131         sigset_t mask;
  132 };
  133 
  134 /*
  135  * KTR_CSW - trace context switches
  136  */
  137 #define KTR_CSW         6
  138 struct ktr_csw_old {
  139         int     out;    /* 1 if switch out, 0 if switch in */
  140         int     user;   /* 1 if usermode (ivcsw), 0 if kernel (vcsw) */
  141 };
  142 
  143 struct ktr_csw {
  144         int     out;    /* 1 if switch out, 0 if switch in */
  145         int     user;   /* 1 if usermode (ivcsw), 0 if kernel (vcsw) */
  146         char    wmesg[8];
  147 };
  148 
  149 /*
  150  * KTR_USER - data coming from userland
  151  */
  152 #define KTR_USER_MAXLEN 2048    /* maximum length of passed data */
  153 #define KTR_USER        7
  154 
  155 /*
  156  * KTR_STRUCT - misc. structs
  157  */
  158 #define KTR_STRUCT      8
  159         /*
  160          * record contains null-terminated struct name followed by
  161          * struct contents
  162          */
  163 struct sockaddr;
  164 struct stat;
  165 struct sysentvec;
  166 
  167 /*
  168  * KTR_SYSCTL - name of a sysctl MIB
  169  */
  170 #define KTR_SYSCTL      9
  171         /* record contains null-terminated MIB name */
  172 
  173 /*
  174  * KTR_PROCCTOR - trace process creation (multiple ABI support)
  175  */
  176 #define KTR_PROCCTOR    10
  177 struct ktr_proc_ctor {
  178         u_int   sv_flags;       /* struct sysentvec sv_flags copy */
  179 };
  180 
  181 /*
  182  * KTR_PROCDTOR - trace process destruction (multiple ABI support)
  183  */
  184 #define KTR_PROCDTOR    11
  185 
  186 /*
  187  * KTR_FAULT - page fault record
  188  */
  189 #define KTR_FAULT       13
  190 struct ktr_fault {
  191         vm_offset_t vaddr;
  192         int type;
  193 };
  194 
  195 /*
  196  * KTR_FAULTEND - end of page fault record
  197  */
  198 #define KTR_FAULTEND    14
  199 struct ktr_faultend {
  200         int result;
  201 };
  202 
  203 /*
  204  * KTR_DROP - If this bit is set in ktr_type, then at least one event
  205  * between the previous record and this record was dropped.
  206  */
  207 #define KTR_DROP        0x8000
  208 
  209 /*
  210  * kernel trace points (in p_traceflag)
  211  */
  212 #define KTRFAC_MASK     0x00ffffff
  213 #define KTRFAC_SYSCALL  (1<<KTR_SYSCALL)
  214 #define KTRFAC_SYSRET   (1<<KTR_SYSRET)
  215 #define KTRFAC_NAMEI    (1<<KTR_NAMEI)
  216 #define KTRFAC_GENIO    (1<<KTR_GENIO)
  217 #define KTRFAC_PSIG     (1<<KTR_PSIG)
  218 #define KTRFAC_CSW      (1<<KTR_CSW)
  219 #define KTRFAC_USER     (1<<KTR_USER)
  220 #define KTRFAC_STRUCT   (1<<KTR_STRUCT)
  221 #define KTRFAC_SYSCTL   (1<<KTR_SYSCTL)
  222 #define KTRFAC_PROCCTOR (1<<KTR_PROCCTOR)
  223 #define KTRFAC_PROCDTOR (1<<KTR_PROCDTOR)
  224 #define KTRFAC_FAULT    (1<<KTR_FAULT)
  225 #define KTRFAC_FAULTEND (1<<KTR_FAULTEND)
  226 
  227 /*
  228  * trace flags (also in p_traceflags)
  229  */
  230 #define KTRFAC_ROOT     0x80000000      /* root set this trace */
  231 #define KTRFAC_INHERIT  0x40000000      /* pass trace flags to children */
  232 #define KTRFAC_DROP     0x20000000      /* last event was dropped */
  233 
  234 #ifdef  _KERNEL
  235 void    ktrnamei(char *);
  236 void    ktrcsw(int, int, const char *);
  237 void    ktrpsig(int, sig_t, sigset_t *, int);
  238 void    ktrfault(vm_offset_t, int);
  239 void    ktrfaultend(int);
  240 void    ktrgenio(int, enum uio_rw, struct uio *, int);
  241 void    ktrsyscall(int, int narg, register_t args[]);
  242 void    ktrsysctl(int *name, u_int namelen);
  243 void    ktrsysret(int, int, register_t);
  244 void    ktrprocctor(struct proc *);
  245 void    ktrprocexec(struct proc *, struct ucred **, struct vnode **);
  246 void    ktrprocexit(struct thread *);
  247 void    ktrprocfork(struct proc *, struct proc *);
  248 void    ktruserret(struct thread *);
  249 void    ktrstruct(const char *, void *, size_t);
  250 #define ktrsockaddr(s) \
  251         ktrstruct("sockaddr", (s), ((struct sockaddr *)(s))->sa_len)
  252 #define ktrstat(s) \
  253         ktrstruct("stat", (s), sizeof(struct stat))
  254 
  255 #else
  256 
  257 #include <sys/cdefs.h>
  258 
  259 __BEGIN_DECLS
  260 int     ktrace(const char *, int, int, pid_t);
  261 int     utrace(const void *, size_t);
  262 __END_DECLS
  263 
  264 #endif
  265 
  266 #endif

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