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: releng/9.0/sys/sys/ktrace.h 219042 2011-02-25 22:05:33Z dchagin $
   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 {
  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 /*
  144  * KTR_USER - data coming from userland
  145  */
  146 #define KTR_USER_MAXLEN 2048    /* maximum length of passed data */
  147 #define KTR_USER        7
  148 
  149 /*
  150  * KTR_STRUCT - misc. structs
  151  */
  152 #define KTR_STRUCT      8
  153         /*
  154          * record contains null-terminated struct name followed by
  155          * struct contents
  156          */
  157 struct sockaddr;
  158 struct stat;
  159 struct sysentvec;
  160 
  161 /*
  162  * KTR_SYSCTL - name of a sysctl MIB
  163  */
  164 #define KTR_SYSCTL      9
  165         /* record contains null-terminated MIB name */
  166 
  167 /*
  168  * KTR_PROCCTOR - trace process creation (multiple ABI support)
  169  */
  170 #define KTR_PROCCTOR    10
  171 struct ktr_proc_ctor {
  172         u_int   sv_flags;       /* struct sysentvec sv_flags copy */
  173 };
  174 
  175 /*
  176  * KTR_PROCDTOR - trace process destruction (multiple ABI support)
  177  */
  178 #define KTR_PROCDTOR    11
  179 
  180 /*
  181  * KTR_DROP - If this bit is set in ktr_type, then at least one event
  182  * between the previous record and this record was dropped.
  183  */
  184 #define KTR_DROP        0x8000
  185 
  186 /*
  187  * kernel trace points (in p_traceflag)
  188  */
  189 #define KTRFAC_MASK     0x00ffffff
  190 #define KTRFAC_SYSCALL  (1<<KTR_SYSCALL)
  191 #define KTRFAC_SYSRET   (1<<KTR_SYSRET)
  192 #define KTRFAC_NAMEI    (1<<KTR_NAMEI)
  193 #define KTRFAC_GENIO    (1<<KTR_GENIO)
  194 #define KTRFAC_PSIG     (1<<KTR_PSIG)
  195 #define KTRFAC_CSW      (1<<KTR_CSW)
  196 #define KTRFAC_USER     (1<<KTR_USER)
  197 #define KTRFAC_STRUCT   (1<<KTR_STRUCT)
  198 #define KTRFAC_SYSCTL   (1<<KTR_SYSCTL)
  199 #define KTRFAC_PROCCTOR (1<<KTR_PROCCTOR)
  200 #define KTRFAC_PROCDTOR (1<<KTR_PROCDTOR)
  201 
  202 /*
  203  * trace flags (also in p_traceflags)
  204  */
  205 #define KTRFAC_ROOT     0x80000000      /* root set this trace */
  206 #define KTRFAC_INHERIT  0x40000000      /* pass trace flags to children */
  207 #define KTRFAC_DROP     0x20000000      /* last event was dropped */
  208 
  209 #ifdef  _KERNEL
  210 void    ktrnamei(char *);
  211 void    ktrcsw(int, int);
  212 void    ktrpsig(int, sig_t, sigset_t *, int);
  213 void    ktrgenio(int, enum uio_rw, struct uio *, int);
  214 void    ktrsyscall(int, int narg, register_t args[]);
  215 void    ktrsysctl(int *name, u_int namelen);
  216 void    ktrsysret(int, int, register_t);
  217 void    ktrprocctor(struct proc *);
  218 void    ktrprocexec(struct proc *, struct ucred **, struct vnode **);
  219 void    ktrprocexit(struct thread *);
  220 void    ktrprocfork(struct proc *, struct proc *);
  221 void    ktruserret(struct thread *);
  222 void    ktrstruct(const char *, void *, size_t);
  223 #define ktrsockaddr(s) \
  224         ktrstruct("sockaddr", (s), ((struct sockaddr *)(s))->sa_len)
  225 #define ktrstat(s) \
  226         ktrstruct("stat", (s), sizeof(struct stat))
  227 
  228 #else
  229 
  230 #include <sys/cdefs.h>
  231 
  232 __BEGIN_DECLS
  233 int     ktrace(const char *, int, int, pid_t);
  234 int     utrace(const void *, size_t);
  235 __END_DECLS
  236 
  237 #endif
  238 
  239 #endif

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