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Postfix Documentation
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Manually tracing a Postfix daemon process

Many systems allow you to inspect a running process with a system call tracer. For example:

# trace -p process-id (SunOS 4)
# strace -p process-id (Linux and many others)
# truss -p process-id (Solaris, FreeBSD)
# ktrace -p process-id (generic 4.4BSD)

Even more informative are traces of system library calls. Examples:

# ltrace -p process-id (Linux, also ported to FreeBSD and BSD/OS)
# sotruss -p process-id (Solaris)

See your system documentation for details.

Tracing a running process can give valuable information about what a process is attempting to do. This is as much information as you can get without running an interactive debugger program, as described in a later section.

Postfix Documentation
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