doc/man/man1/dyld_usage.1

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   3 .TH "DYLD_USAGE" "1" "2018-07-28" "" "dyld"
   4 .SH NAME
   5 dyld_usage \- report dynamic linker activity in real-time
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  32 ..
  33 .SH SYNOPSIS
  34 .sp
  35 \fBdyld_usage\fP \fB[\-e] [\-f mode] [\-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 .UNINDENT
  60 .INDENT 0.0
  61 .TP
  62 .B \-R
  63 specifies a raw trace file to process.
  64 .UNINDENT
  65 .INDENT 0.0
  66 .TP
  67 .B \-t
  68 specifies timeout in seconds (for use in automated tools).
  69 .UNINDENT
  70 .SH DISPLAY
  71 .sp
  72 The data columns displayed are as follows:
  73 .INDENT 0.0
  74 .INDENT 3.5
  75 .INDENT 0.0
  76 .TP
  77 .B TIMESTAMP
  78 Time of day when call occurred.
  79 .TP
  80 .B OPERATION
  81 The \fIdyld\fP operation triggered by the process. Typically these operations
  82 are triggered by process launch or via a \fBdlopen\fP or \fBdlsym\fP system
  83 call. System call entries include both the parameters to the system call and
  84 the system call\(aqs return code (e.g., 0 on success).
  85 .TP
  86 .B TIME INTERVAL
  87 The elapsed time spent in the dynamic linker operation or system call.
  88 .TP
  89 .B PROCESS NAME
  90 The process that generated the dynamic linker activity. If space allows, the
  91 thread id will be appended to the process name (i.e., Mail.nnn).
  92 .UNINDENT
  93 .UNINDENT
  94 .UNINDENT
  95 .SH SAMPLE USAGE
  96 .INDENT 0.0
  97 .INDENT 3.5
  98 \fBsudo dyld_usage Mail\fP
  99 .sp
 100 \fBdyld_usage\fP will display dynamic link operations for all instances of
 101 processes named Mail.
 102 .UNINDENT
 103 .UNINDENT
 104 .SH SEE ALSO
 105 .sp
 106 \fBdyld(1)\fP, \fBfs_usage(1)\fP
 107 .SH AUTHOR
 108 Apple, Inc.
 109 .SH COPYRIGHT
 110 2000-2018, Apple, Inc.
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