Process Argument List

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The arguments are presented as a single character string, with arguments separated by NULs.
NUL vs. NULL. NUL is the character with integer value 0. It is different from NULL, which is a pointer with value 0.
NULL is a pointer value that you can be sure will never correspond to a real memory address in your program.
In C and C++, NUL is expressed as the character constant ' $\\ 0$ ', or (char) 0. The definition of NULL differs among operating systems; on Linux, it is defined as ((void*)0) in C and simply 0 in C++.
The http://siber.cankaya.edu.tr/SystemsProgramming/cfiles/print-arg-list.cprogram Fig. 3 prints the argument list of the process with the specified process ID.

Figure 3: Print the Argument List of a Running Process.
$\begin{figure}\begin{center} \scriptsize \begin{verbatim} ...$
```
$ ./print-arg-list PID
```

**Figure 3:** Print the Argument List of a Running Process.
$\begin{figure}\begin{center} \scriptsize \begin{verbatim} ...$

Cem Ozdogan 2007-05-07