doc/man/man1/dyld_usage.1

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   3 .TH "DYLD_USAGE" "1" "2020-04-13" "" "dyld"
   4 .SH NAME
   5 dyld_usage \- report dynamic linker activity in real-time
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  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.
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