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	2	.
	3	.TH "DYLD_USAGE" "1" "2020-04-13" "" "dyld"
	4	.SH NAME
	5	dyld_usage \- report dynamic linker activity in real-time
	6	.
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	17	..
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	32	..
	33	.SH SYNOPSIS
	34	.sp
	35	\fBdyld_usage\fP \fB[\-e] [\-f mode] [\-j] [\-h] [\-t seconds] [\-R rawfile [\-S start_time]
	36	[\-E end_time]] [pid \| cmd [pid \| cmd] ...]\fP
	37	.SH DESCRIPTION
	38	.sp
	39	The \fBdyld_usage\fP utility presents an ongoing display of information
	40	pertaining to dynamic linker activity within one or more processes. It requires
	41	root privileges due to the kernel tracing facility it uses to operate. By
	42	default \fBdyld_usage\fP monitors \fIdyld\fP activity in all processes except
	43	the running \fIdyld_usage\fP process, \fITerminal\fP, \fItelnetd\fP, \fIsshd\fP, \fIrlogind\fP,
	44	\fItcsh\fP, \fIcsh\fP, and \fIsh\fP\&. These defaults can be overridden such that output is
	45	limited to include or exclude a list of processes specified on the command line.
	46	Processes may be specified either by file name or by process id.
	47	.sp
	48	The output of \fBdyld_usage\fP is formatted according to the size of your
	49	window. A narrow window will display fewer columns of data. Use a wide window
	50	for maximum data display.
	51	.SH OPTIONS
	52	.sp
	53	\fBdyld_usage\fP supports the following options:
	54	.INDENT 0.0
	55	.TP
	56	.B \-e
	57	Exclude the specified list of pids and commands from the sample, and exclude
	58	\fBdyld_usage\fP by default.
	59	.INDENT 7.0
	60	.TP
	61	.B \-j
	62	.UNINDENT
	63	.sp
	64	Display output in JSON format.
	65	.UNINDENT
	66	.INDENT 0.0
	67	.TP
	68	.B \-h
	69	Display usage information and exit.
	70	.UNINDENT
	71	.INDENT 0.0
	72	.TP
	73	.B \-R
	74	Specify a raw trace file to process.
	75	.UNINDENT
	76	.INDENT 0.0
	77	.TP
	78	.B \-t
	79	Specify timeout in seconds (for use in automated tools).
	80	.UNINDENT
	81	.SH DISPLAY
	82	.sp
	83	The data columns displayed are as follows:
	84	.INDENT 0.0
	85	.INDENT 3.5
	86	.INDENT 0.0
	87	.TP
	88	.B TIMESTAMP
	89	Time of day when call occurred.
	90	.TP
	91	.B OPERATION
	92	The \fIdyld\fP operation triggered by the process. Typically these operations
	93	are triggered by process launch or via a \fBdlopen\fP or \fBdlsym\fP system
	94	call. System call entries include both the parameters to the system call and
	95	the system call\(aqs return code (e.g., 0 on success).
	96	.TP
	97	.B TIME INTERVAL
	98	The elapsed time spent in the dynamic linker operation or system call.
	99	.TP
	100	.B PROCESS NAME
	101	The process that generated the dynamic linker activity. If space allows, the
	102	thread id will be appended to the process name (i.e., Mail.nnn).
	103	.UNINDENT
	104	.UNINDENT
	105	.UNINDENT
	106	.SH SAMPLE USAGE
	107	.INDENT 0.0
	108	.INDENT 3.5
	109	\fBsudo dyld_usage Mail\fP
	110	.sp
	111	\fBdyld_usage\fP will display dynamic link operations for all instances of
	112	processes named Mail.
	113	.UNINDENT
	114	.UNINDENT
	115	.SH SEE ALSO
	116	.sp
	117	\fBdyld(1)\fP, \fBfs_usage(1)\fP
	118	.SH AUTHOR
	119	Apple, Inc.
	120	.SH COPYRIGHT
	121	2000-2020, Apple, Inc.
	122	.\" Generated by docutils manpage writer.
	123	.