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32 .\" @(#)ktrace.2 8.1 (Berkeley) 6/4/93
33 .\" $FreeBSD: src/lib/libc/sys/ktrace.2,v 1.9.2.7 2001/12/14 18:34:01 ru Exp $
34 .\" $DragonFly: src/lib/libc/sys/ktrace.2,v 1.4 2008/10/16 08:15:18 swildner Exp $
50 .Fn ktrace "const char *tracefile" "int ops" "int trpoints" "int pid"
54 function enables or disables tracing of one or more processes.
55 Users may only trace their own processes.
56 Only the super-user can trace setuid or setgid programs.
60 gives the pathname of the file to be used for tracing.
61 The file must exist and be a regular file writable by the calling process.
62 All trace records are always appended to the file,
63 so the file must be truncated to zero length to discard
65 If tracing points are being disabled (see KTROP_CLEAR below),
71 parameter specifies the requested ktrace operation.
72 The defined operations are:
73 .Bl -column KTRFLAG_DESCENDXXX -offset indent
74 .It "KTROP_SET Enable trace points specified in"
76 .It "KTROP_CLEAR Disable trace points specified in
78 .It "KTROP_CLEARFILE Stop all tracing."
79 .It "KTRFLAG_DESCEND The tracing change should apply to the"
80 specified process and all its current children.
85 parameter specifies the trace points of interest.
86 The defined trace points are:
87 .Bl -column KTRFAC_SYSCALLXXX -offset indent
88 .It "KTRFAC_SYSCALL Trace system calls."
89 .It "KTRFAC_SYSRET Trace return values from system calls."
90 .It "KTRFAC_NAMEI Trace name lookup operations."
91 .It "KTRFAC_GENIO Trace all I/O (note that this option can"
92 generate much output).
93 .It "KTRFAC_PSIG Trace posted signals."
94 .It "KTRFAC_CSW Trace context switch points."
95 .It "KTRFAC_INHERIT Inherit tracing to future children."
98 Each tracing event outputs a record composed of a generic header
99 followed by a trace point specific structure.
100 The generic header is:
103 int ktr_len; /* length of buf */
104 short ktr_type; /* trace record type */
105 pid_t ktr_pid; /* process id */
106 char ktr_comm[MAXCOMLEN+1]; /* command name */
107 struct timeval ktr_time; /* timestamp */
114 field specifies the length of the
116 data that follows this header.
121 fields specify the process and command generating the record.
124 field gives the time (with microsecond resolution)
125 that the record was generated.
128 is an internal kernel pointer and is not useful.
130 The generic header is followed by
135 The type specific records are defined in the
145 A component of the path prefix is not a directory.
146 .It Bq Er ENAMETOOLONG
147 A component of a pathname exceeded 255 characters,
148 or an entire path name exceeded 1023 characters.
150 The named tracefile does not exist.
152 Search permission is denied for a component of the path prefix.
154 Too many symbolic links were encountered in translating the pathname.
156 An I/O error occurred while reading from or writing to the file system.
158 The kernel was not compiled with
169 function call first appeared in