Annotation of src/usr.bin/ktrace/ktrace.1, Revision 1.24
1.24 ! miod 1: .\" $OpenBSD: ktrace.1,v 1.23 2012/07/12 16:45:15 guenther 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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1.24 ! miod 32: .Dd $Mdocdate: July 12 2012 $
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
1.23 guenther 40: .Op Fl aBCcdi
1.1 deraadt 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:
1.24 ! miod 76: .Bl -tag -width 9n
1.1 deraadt 77: .It Fl a
1.5 deraadt 78: Append to the trace file instead of recreating it.
1.23 guenther 79: .It Fl B
80: Set the
81: .Ev LD_BIND_NOW
82: environment variable to specify that the dynamic linker should process
83: relocations immediately instead of as they are encountered.
84: This eliminates the resulting
85: .Xr ld.so 1
86: relocation sequences.
1.1 deraadt 87: .It Fl C
88: Disable tracing on all user owned processes, and, if executed by root, all
89: processes in the system.
90: .It Fl c
1.20 jmc 91: Clear the trace points associated with the trace file or any specified
92: processes.
1.1 deraadt 93: .It Fl d
94: Descendants; perform the operation for all current children of the
95: designated processes.
1.17 jmc 96: .It Fl f Ar trfile
1.1 deraadt 97: Log trace records to
1.18 jmc 98: .Ar trfile
1.1 deraadt 99: instead of
100: .Pa ktrace.out .
1.7 aaron 101: .It Fl g Ar pgid
1.1 deraadt 102: Enable (disable) tracing on all processes in the process group (only one
103: .Fl g
104: flag is permitted).
105: .It Fl i
106: Inherit; pass the trace flags to all future children of the designated
107: processes.
1.7 aaron 108: .It Fl p Ar pid
1.6 aaron 109: Enable (disable) tracing on the indicated process ID (only one
1.1 deraadt 110: .Fl p
111: flag is permitted).
1.7 aaron 112: .It Fl t Ar trstr
1.1 deraadt 113: The string argument represents the kernel trace points, one per letter.
1.11 deraadt 114: The default flags are
1.13 jmc 115: .Cm c ,
116: .Cm e ,
117: .Cm i ,
118: .Cm n ,
1.21 otto 119: .Cm s ,
1.24 ! miod 120: .Cm t ,
1.22 jmc 121: and
1.24 ! miod 122: .Cm u .
1.1 deraadt 123: The following table equates the letters with the tracepoints:
124: .Pp
1.14 jmc 125: .Bl -tag -width flag -offset indent -compact
1.1 deraadt 126: .It Cm c
127: trace system calls
128: .It Cm e
129: trace emulation changes
130: .It Cm i
1.14 jmc 131: trace I/O
1.11 deraadt 132: .It Cm n
133: trace namei translations
1.1 deraadt 134: .It Cm s
135: trace signal processing
1.21 otto 136: .It Cm t
137: trace various structures
1.24 ! miod 138: .It Cm u
! 139: trace user data coming from
! 140: .Xr utrace 2
1.13 jmc 141: .It Cm w
1.11 deraadt 142: trace context switch points
1.20 jmc 143: .It Cm +
144: trace the default points
1.1 deraadt 145: .El
146: .It Ar command
147: Execute
148: .Ar command
149: with the specified trace flags.
150: .El
151: .Pp
152: The
153: .Fl p ,
154: .Fl g ,
155: and
156: .Ar command
157: options are mutually exclusive.
1.13 jmc 158: .Sh FILES
159: .Bl -tag -width ktrace.out -compact
160: .It Pa ktrace.out
161: default ktrace dump file
162: .El
1.1 deraadt 163: .Sh EXAMPLES
1.16 jmc 164: Trace all kernel operations of process ID 34:
1.1 deraadt 165: .Dl $ ktrace -p 34
1.16 jmc 166: .Pp
167: Trace all kernel operations of processes in process group 15 and
168: pass the trace flags to all current and future children:
1.1 deraadt 169: .Dl $ ktrace -idg 15
170: .Pp
1.16 jmc 171: Disable all tracing of process 65:
1.1 deraadt 172: .Dl $ ktrace -cp 65
173: .Pp
1.16 jmc 174: Disable tracing signals on process 70 and all current children:
1.1 deraadt 175: .Dl $ ktrace -t s -cdp 70
176: .Pp
1.16 jmc 177: Enable tracing of I/O on process 67:
1.1 deraadt 178: .Dl $ ktrace -ti -p 67
179: .Pp
1.16 jmc 180: Run the command
181: .Xr w 1 ,
182: tracing only system calls:
1.1 deraadt 183: .Dl $ ktrace -tc w
184: .Pp
1.16 jmc 185: Disable all tracing to the file "tracedata":
1.1 deraadt 186: .Dl $ ktrace -c -f tracedata
187: .Pp
1.16 jmc 188: Disable tracing of all processes owned by the user:
1.1 deraadt 189: .Dl $ ktrace -C
190: .Sh SEE ALSO
1.15 grunk 191: .Xr kdump 1 ,
1.24 ! miod 192: .Xr ktrace 2 ,
! 193: .Xr utrace 2
1.1 deraadt 194: .Sh HISTORY
195: The
196: .Nm ktrace
1.6 aaron 197: command appeared in
1.1 deraadt 198: .Bx 4.4 .
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