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Full Discussion: how to use truss?
Top Forums Shell Programming and Scripting how to use truss? Post 302178828 by rhfrommn on Wednesday 26th of March 2008 11:37:31 AM
Old 03-26-2008
You use truss on the same command line where you give the command you want to study. Use -o to store the output in a file or you'll get a giant scroll of stuff on your screen that will be impossible to read. Like this:

truss -o mytruss.txt myscript.sh

Where myscript.sh is what you want to learn about and mytruss.txt is the textfile to store the output in. Then just read mytruss.txt.

Now, READING the output is a whole other thing. It is very complicated if you've never seen it. No simple tips I can give you, just take a look and see what you can figure out - google stuff that doesn't make sense.

For your specific questions:

To truss an already running process use the -p flag and give the PID of the process you want to study.

To see why it isn't opening a device I guess you'd look at the open and close statements to see what isn't matching or where it breaks down. Every time your process opens or closes a file truss will tell you about it, so you may see the spot of your script/command where you expect the device to open but no file open happens.

I'm not sure about using truss within a script - to use it on a script I'd simply use truss and run the script as the command to trace.

Last edited by rhfrommn; 03-26-2008 at 12:41 PM.. Reason: Add more info
 

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sotruss(1)							   User Commands							sotruss(1)

NAME
sotruss - trace shared library procedure calls SYNOPSIS
/usr/bin/sotruss [-f] [-F bindfromlist] [-T bindtolist] [-o outputfile] executable [ executable arguments...] DESCRIPTION
sotruss executes the specified command and produces a trace of the library calls that it performs. Each line of the trace output reports what bindings are occurring between dynamic objects as each procedure call is executed. sotruss traces all of the procedure calls that occur between dynamic objects via the Procedure Linkage Table, so only those procedure calls which are bound via the Procedure Linkage Ta- ble will be traced. See Linker and Libraries Guide OPTIONS
-F bindfromlist A colon-separated list of libraries that are to be traced. Only calls from these libraries will be traced. The default is to trace calls from the main executable only. -T bindtolist A colon-separated list of libraries that are to be traced. Only calls to these libraries will be traced. The default is to trace all calls. -o outputfile sotruss output will be directed to the outputfile. If this option is combined with the -f option then the pid of the executing program will be placed at the end of the filename. By default sotruss output is placed on stderr. -f Follow all children created by fork() and print truss output on each child process. This option will also cause a pid to be output on each truss output line. EXAMPLES
Example 1: An example of sotruss. A simple example shows the tracing of a simple ls command: % sotruss ls | more ls -> libc.so.1:*atexit(0xef7d7d1c, 0x23c00, 0x0) ls -> libc.so.1:*atexit(0x1392c, 0xef7d7d1c, 0xef621bb0) ls -> libc.so.1:*setlocale(0x6, 0x1396c, 0xef621ba8) ls -> libc.so.1:*textdomain(0x13970, 0x1396c, 0xef621ba8) ls -> libc.so.1:*time(0x0, 0xef61f6fc, 0xef621ba8) ls -> libc.so.1:*isatty(0x1, 0xef61f6fc, 0x0) ls -> libc.so.1:*getopt(0x1, 0xeffff8fc, 0x13980) ls -> libc.so.1:*malloc(0x100, 0x0, 0x0) ls -> libc.so.1:*malloc(0x9000, 0x0, 0x0) ls -> libc.so.1:*lstat64(0x23ee8, 0xeffff7a0, 0x0) ... ls -> libc.so.1:*printf(0x13a64, 0x26208, 0x23ef0) ls -> libc.so.1:*printf(0x13a64, 0x26448, 0x23ef0) ls -> libc.so.1:*exit(0x0, 0x24220, 0x2421c) ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWtoo | +-----------------------------+-----------------------------+ SEE ALSO
ld.so.1(1), truss(1), whocalls(1), fork(2), attributes(5) Linker and Libraries Guide SunOS 5.10 12 May 1997 sotruss(1)
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