118 lines
2.5 KiB
Groff
118 lines
2.5 KiB
Groff
.\" $FreeBSD$
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.\"
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.Dd July 24, 2017
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.Dt TRUSS 1
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.Os
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.Sh NAME
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.Nm truss
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.Nd trace system calls
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.Sh SYNOPSIS
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.Nm
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.Op Fl facedDHS
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.Op Fl o Ar file
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.Op Fl s Ar strsize
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.Fl p Ar pid
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.Nm
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.Op Fl facedDHS
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.Op Fl o Ar file
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.Op Fl s Ar strsize
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.Ar command Op Ar args
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.Sh DESCRIPTION
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The
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.Nm
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utility traces the system calls called by the specified process or program.
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Output is to the specified output file, or standard error by default.
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It does this by stopping and restarting the process being monitored via
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.Xr ptrace 2 .
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.Pp
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The options are as follows:
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.Bl -tag -width indent
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.It Fl f
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Trace descendants of the original traced process created by
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.Xr fork 2 ,
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.Xr vfork 2 ,
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etc.
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To distinguish events between processes,
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the process ID
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.Pq PID
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of the process is included in the output of each event.
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.It Fl a
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Show the argument strings that are passed in each
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.Xr execve 2
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system call.
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.It Fl c
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Do not display individual system calls or signals.
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Instead, before exiting, print a summary containing for each system call:
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the total system time used,
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the number of times the call was invoked,
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and the number of times the call returned with an error.
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.It Fl e
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Show the environment strings that are passed in each
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.Xr execve 2
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system call.
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.It Fl d
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Include timestamps in the output showing the time elapsed
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since the trace was started.
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.It Fl D
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Include timestamps in the output showing the time elapsed
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since the last recorded event.
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.It Fl H
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Include the thread ID of in the output of each event.
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.It Fl S
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Do not display information about signals received by the process.
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(Normally,
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.Nm
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displays signal as well as system call events.)
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.It Fl o Ar file
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Print the output to the specified
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.Ar file
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instead of standard error.
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.It Fl s Ar strsize
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Display strings using at most
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.Ar strsize
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characters.
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If the buffer is larger,
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.Dq Li ...
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will be displayed at the end of the string.
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The default
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.Ar strsize
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is 32.
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.It Fl p Ar pid
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Follow the process specified by
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.Ar pid
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instead of a new command.
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.It Ar command Op Ar args
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Execute
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.Ar command
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and trace the system calls of it.
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(The
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.Fl p
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and
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.Ar command
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options are mutually exclusive.)
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.El
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.Sh EXAMPLES
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Follow the system calls used in echoing "hello":
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.Dl $ truss /bin/echo hello
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.Pp
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Do the same, but put the output into a file:
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.Dl $ truss -o /tmp/truss.out /bin/echo hello
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.Pp
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Follow an already-running process:
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.Dl $ truss -p 34
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.Sh SEE ALSO
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.Xr dtrace 1 ,
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.Xr kdump 1 ,
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.Xr ktrace 1 ,
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.Xr ptrace 2 ,
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.Xr utrace 2
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.Sh HISTORY
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The
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.Nm
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command was written by
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.An Sean Eric Fagan
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for
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.Fx .
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It was modeled after
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similar commands available for System V Release 4 and SunOS.
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