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  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by the University of
   16  *      California, Berkeley and its contributors.
   17  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      @(#)ktrace.h    8.1 (Berkeley) 6/2/93
   34  * $FreeBSD: releng/5.2/sys/sys/ktrace.h 116101 2003-06-09 17:38:32Z jhb $
   35  */
   36 
   37 #ifndef _SYS_KTRACE_H_
   38 #define _SYS_KTRACE_H_
   39 
   40 /*
   41  * operations to ktrace system call  (KTROP(op))
   42  */
   43 #define KTROP_SET               0       /* set trace points */
   44 #define KTROP_CLEAR             1       /* clear trace points */
   45 #define KTROP_CLEARFILE         2       /* stop all tracing to file */
   46 #define KTROP(o)                ((o)&3) /* macro to extract operation */
   47 /*
   48  * flags (ORed in with operation)
   49  */
   50 #define KTRFLAG_DESCEND         4       /* perform op on all children too */
   51 
   52 /*
   53  * ktrace record header
   54  */
   55 struct ktr_header {
   56         int     ktr_len;                /* length of buf */
   57         short   ktr_type;               /* trace record type */
   58         pid_t   ktr_pid;                /* process id */
   59         char    ktr_comm[MAXCOMLEN+1];  /* command name */
   60         struct  timeval ktr_time;       /* timestamp */
   61         void    *ktr_buffer;
   62 };
   63 
   64 /*
   65  * Test for kernel trace point (MP SAFE).
   66  *
   67  * KTRCHECK() just checks that the type is enabled and is only for
   68  * internal use in the ktrace subsystem.  KTRPOINT() checks against
   69  * ktrace recursion as well as checking that the type is enabled and
   70  * is the public interface.
   71  */
   72 #define KTRCHECK(td, type)      ((td)->td_proc->p_traceflag & (1 << type))
   73 #define KTRPOINT(td, type)                                              \
   74         (KTRCHECK((td), (type)) && !((td)->td_pflags & TDP_INKTRACE))
   75 
   76 /*
   77  * ktrace record types
   78  */
   79 
   80 /*
   81  * KTR_SYSCALL - system call record
   82  */
   83 #define KTR_SYSCALL     1
   84 struct ktr_syscall {
   85         short   ktr_code;               /* syscall number */
   86         short   ktr_narg;               /* number of arguments */
   87         /*
   88          * followed by ktr_narg register_t
   89          */
   90         register_t      ktr_args[1];
   91 };
   92 
   93 /*
   94  * KTR_SYSRET - return from system call record
   95  */
   96 #define KTR_SYSRET      2
   97 struct ktr_sysret {
   98         short   ktr_code;
   99         short   ktr_eosys;
  100         int     ktr_error;
  101         register_t      ktr_retval;
  102 };
  103 
  104 /*
  105  * KTR_NAMEI - namei record
  106  */
  107 #define KTR_NAMEI       3
  108         /* record contains pathname */
  109 
  110 /*
  111  * KTR_GENIO - trace generic process i/o
  112  */
  113 #define KTR_GENIO       4
  114 struct ktr_genio {
  115         int     ktr_fd;
  116         enum    uio_rw ktr_rw;
  117         /*
  118          * followed by data successfully read/written
  119          */
  120 };
  121 
  122 /*
  123  * KTR_PSIG - trace processed signal
  124  */
  125 #define KTR_PSIG        5
  126 struct ktr_psig {
  127         int     signo;
  128         sig_t   action;
  129         int     code;
  130         sigset_t mask;
  131 };
  132 
  133 /*
  134  * KTR_CSW - trace context switches
  135  */
  136 #define KTR_CSW         6
  137 struct ktr_csw {
  138         int     out;    /* 1 if switch out, 0 if switch in */
  139         int     user;   /* 1 if usermode (ivcsw), 0 if kernel (vcsw) */
  140 };
  141 
  142 /*
  143  * KTR_USER - data comming from userland
  144  */
  145 #define KTR_USER_MAXLEN 2048    /* maximum length of passed data */
  146 #define KTR_USER        7
  147 
  148 /*
  149  * KTR_DROP - If this bit is set in ktr_type, then at least one event
  150  * between the previous record and this record was dropped.
  151  */
  152 #define KTR_DROP        0x8000
  153 
  154 /*
  155  * kernel trace points (in p_traceflag)
  156  */
  157 #define KTRFAC_MASK     0x00ffffff
  158 #define KTRFAC_SYSCALL  (1<<KTR_SYSCALL)
  159 #define KTRFAC_SYSRET   (1<<KTR_SYSRET)
  160 #define KTRFAC_NAMEI    (1<<KTR_NAMEI)
  161 #define KTRFAC_GENIO    (1<<KTR_GENIO)
  162 #define KTRFAC_PSIG     (1<<KTR_PSIG)
  163 #define KTRFAC_CSW      (1<<KTR_CSW)
  164 #define KTRFAC_USER     (1<<KTR_USER)
  165 /*
  166  * trace flags (also in p_traceflags)
  167  */
  168 #define KTRFAC_ROOT     0x80000000      /* root set this trace */
  169 #define KTRFAC_INHERIT  0x40000000      /* pass trace flags to children */
  170 #define KTRFAC_DROP     0x20000000      /* last event was dropped */
  171 
  172 #ifdef  _KERNEL
  173 extern struct mtx ktrace_mtx;
  174 
  175 void    ktrnamei(char *);
  176 void    ktrcsw(int, int);
  177 void    ktrpsig(int, sig_t, sigset_t *, int);
  178 void    ktrgenio(int, enum uio_rw, struct uio *, int);
  179 void    ktrsyscall(int, int narg, register_t args[]);
  180 void    ktrsysret(int, int, register_t);
  181 
  182 #else
  183 
  184 #include <sys/cdefs.h>
  185 
  186 __BEGIN_DECLS
  187 int     ktrace(const char *, int, int, pid_t);
  188 int     utrace(const void *, size_t);
  189 __END_DECLS
  190 
  191 #endif
  192 
  193 #endif

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