sys/ddb/db_capture.c

28  * DDB capture support: capture kernel debugger output into a fixed-size
62 static MALLOC_DEFINE(M_DDB_CAPTURE, "ddb_capture", "DDB capture buffer");
77 static int db_capture_inpager;		/* Suspend capture in pager. */
78 static int db_capture_inprogress;	/* DDB capture currently in progress. */
83 static SYSCTL_NODE(_debug_ddb, OID_AUTO, capture, CTLFLAG_RW, 0,
84     "DDB capture options");
87     &db_capture_bufoff, 0, "Bytes of data in DDB capture buffer");
91     "Maximum value for debug.ddb.capture.bufsize");
94     &db_capture_inprogress, 0, "DDB output capture in progress");
97  * Boot-time allocation of the DDB capture buffer, if any.  Force all buffer
104 	TUNABLE_INT_FETCH("debug.ddb.capture.bufsize", &db_capture_bufsize);
118  * Run-time adjustment of the capture buffer.
168     "Size of DDB capture buffer");
171  * Sysctl to read out the capture buffer from userspace.  We require
193     NULL, 0, sysctl_debug_ddb_capture_data, "A", "DDB capture data");
237  * Zero out any bytes left in the last block of the DDB capture buffer.  This
239  * capture is stopped, in order to avoid injecting nul's into the middle of
254  * Reset capture state, which flushes buffers.
266  * Start capture.  Only one session is allowed at any time, but we may
281  * Terminate DDB output capture--real work is deferred to db_capture_dump,
283  * capture may be started again before the dump takes place.
297  * Dump DDB(4) captured output (and resets capture buffers).
319  * DDB(4) command to manage capture:
321  * capture on          - start DDB output capture
322  * capture off         - stop DDB output capture
323  * capture reset       - reset DDB capture buffer (also stops capture)
324  * capture status      - print DDB output capture status
330 	db_error("capture [on|off|reset|status]\n");
355 			db_printf("capture is on\n");
357 			db_printf("capture is off\n");