Annotation of src/usr.bin/ktrace/ktrace.1, Revision 1.22
1.22 ! jmc 1: .\" $OpenBSD: ktrace.1,v 1.21 2011/07/08 19:29:44 otto Exp $
1.9 aaron 2: .\"
1.1 deraadt 3: .\" Copyright (c) 1990, 1993
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1.1 deraadt 15: .\" may be used to endorse or promote products derived from this software
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1.22 ! jmc 32: .Dd $Mdocdate: July 8 2011 $
1.1 deraadt 33: .Dt KTRACE 1
1.7 aaron 34: .Os
1.1 deraadt 35: .Sh NAME
36: .Nm ktrace
37: .Nd enable kernel process tracing
38: .Sh SYNOPSIS
39: .Nm ktrace
40: .Op Fl aCcdi
41: .Op Fl f Ar trfile
1.14 jmc 42: .Op Fl g Ar pgid
1.1 deraadt 43: .Op Fl p Ar pid
44: .Op Fl t Ar trstr
45: .Nm ktrace
46: .Op Fl adi
47: .Op Fl f Ar trfile
48: .Op Fl t Ar trstr
1.6 aaron 49: .Ar command
1.1 deraadt 50: .Sh DESCRIPTION
1.6 aaron 51: .Nm ktrace
1.1 deraadt 52: enables kernel trace logging for the specified processes.
1.8 aaron 53: By default, kernel trace data is logged to the file
54: .Pa ktrace.out ,
55: unless overridden by the
56: .Fl f
57: option.
1.20 jmc 58: The kernel operations traced are system calls, namei translations,
59: signal processing, I/O and emulation changes.
1.1 deraadt 60: .Pp
61: Once tracing is enabled on a process, trace data will be logged until
62: either the process exits or the trace point is cleared.
63: A traced process can generate enormous amounts of log data quickly;
1.8 aaron 64: it is strongly suggested that users memorize how to disable tracing before
1.1 deraadt 65: attempting to trace a process.
66: The following command is sufficient to disable tracing on all user owned
67: processes, and, if executed by root, all processes:
68: .Pp
1.14 jmc 69: .Dl $ ktrace -C
1.1 deraadt 70: .Pp
1.6 aaron 71: The trace file is not human-readable; use
1.1 deraadt 72: .Xr kdump 1
73: to decode it.
74: .Pp
75: The options are as follows:
1.14 jmc 76: .Bl -tag -width "-t trstr"
1.1 deraadt 77: .It Fl a
1.5 deraadt 78: Append to the trace file instead of recreating it.
1.1 deraadt 79: .It Fl C
80: Disable tracing on all user owned processes, and, if executed by root, all
81: processes in the system.
82: .It Fl c
1.20 jmc 83: Clear the trace points associated with the trace file or any specified
84: processes.
1.1 deraadt 85: .It Fl d
86: Descendants; perform the operation for all current children of the
87: designated processes.
1.17 jmc 88: .It Fl f Ar trfile
1.1 deraadt 89: Log trace records to
1.18 jmc 90: .Ar trfile
1.1 deraadt 91: instead of
92: .Pa ktrace.out .
1.7 aaron 93: .It Fl g Ar pgid
1.1 deraadt 94: Enable (disable) tracing on all processes in the process group (only one
95: .Fl g
96: flag is permitted).
97: .It Fl i
98: Inherit; pass the trace flags to all future children of the designated
99: processes.
1.7 aaron 100: .It Fl p Ar pid
1.6 aaron 101: Enable (disable) tracing on the indicated process ID (only one
1.1 deraadt 102: .Fl p
103: flag is permitted).
1.7 aaron 104: .It Fl t Ar trstr
1.1 deraadt 105: The string argument represents the kernel trace points, one per letter.
1.11 deraadt 106: The default flags are
1.13 jmc 107: .Cm c ,
108: .Cm e ,
109: .Cm i ,
110: .Cm n ,
1.21 otto 111: .Cm s ,
1.22 ! jmc 112: and
1.21 otto 113: .Cm t .
1.1 deraadt 114: The following table equates the letters with the tracepoints:
115: .Pp
1.14 jmc 116: .Bl -tag -width flag -offset indent -compact
1.1 deraadt 117: .It Cm c
118: trace system calls
119: .It Cm e
120: trace emulation changes
121: .It Cm i
1.14 jmc 122: trace I/O
1.11 deraadt 123: .It Cm n
124: trace namei translations
1.1 deraadt 125: .It Cm s
126: trace signal processing
1.21 otto 127: .It Cm t
128: trace various structures
1.13 jmc 129: .It Cm w
1.11 deraadt 130: trace context switch points
1.20 jmc 131: .It Cm +
132: trace the default points
1.1 deraadt 133: .El
134: .It Ar command
135: Execute
136: .Ar command
137: with the specified trace flags.
138: .El
139: .Pp
140: The
141: .Fl p ,
142: .Fl g ,
143: and
144: .Ar command
145: options are mutually exclusive.
1.13 jmc 146: .Sh FILES
147: .Bl -tag -width ktrace.out -compact
148: .It Pa ktrace.out
149: default ktrace dump file
150: .El
1.1 deraadt 151: .Sh EXAMPLES
1.16 jmc 152: Trace all kernel operations of process ID 34:
1.1 deraadt 153: .Dl $ ktrace -p 34
1.16 jmc 154: .Pp
155: Trace all kernel operations of processes in process group 15 and
156: pass the trace flags to all current and future children:
1.1 deraadt 157: .Dl $ ktrace -idg 15
158: .Pp
1.16 jmc 159: Disable all tracing of process 65:
1.1 deraadt 160: .Dl $ ktrace -cp 65
161: .Pp
1.16 jmc 162: Disable tracing signals on process 70 and all current children:
1.1 deraadt 163: .Dl $ ktrace -t s -cdp 70
164: .Pp
1.16 jmc 165: Enable tracing of I/O on process 67:
1.1 deraadt 166: .Dl $ ktrace -ti -p 67
167: .Pp
1.16 jmc 168: Run the command
169: .Xr w 1 ,
170: tracing only system calls:
1.1 deraadt 171: .Dl $ ktrace -tc w
172: .Pp
1.16 jmc 173: Disable all tracing to the file "tracedata":
1.1 deraadt 174: .Dl $ ktrace -c -f tracedata
175: .Pp
1.16 jmc 176: Disable tracing of all processes owned by the user:
1.1 deraadt 177: .Dl $ ktrace -C
178: .Sh SEE ALSO
1.15 grunk 179: .Xr kdump 1 ,
180: .Xr ktrace 2
1.1 deraadt 181: .Sh HISTORY
182: The
183: .Nm ktrace
1.6 aaron 184: command appeared in
1.1 deraadt 185: .Bx 4.4 .
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