50a2f19faf
Correct usage: one of {-p pid, command} is required.
Open output file when command line is fully analyzed: incorrect `truss -o f'
command does not create an empty file anymore.
68 lines
1.4 KiB
Groff
68 lines
1.4 KiB
Groff
.Dd Nov 23, 1997
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.Dt TRUSS 1
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.Os FreeBSD
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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 truss
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.Op Fl S
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.Op Fl o Ar file
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.Fl p Ar pid
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.Nm truss
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.Op Fl S
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.Op Fl o Ar file
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command
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.Op args
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.Sh DESCRIPTION
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.Nm Truss
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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 procfs 5 .
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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 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 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 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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.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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# 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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# Follow an already-running process
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.Dl $ truss -p 1
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.Sh SEE ALSO
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.Xr kdump 1 ,
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.Xr ktrace 1 ,
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.Xr procfs 5
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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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.Bx Free Ns ;
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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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