Question

I wonder if there are some API to get the current process’ command line arguments on Linux.

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I guess I was terribly unclear. The real purpose of the question was about passing unicode file names through command line arguments.

Answer 1

Read from file /proc/self/cmdline

For example:

[wallyk@zf ~]$ od -a /proc/30651/cmdline
0000000   /   u   s   r   /   s   b   i   n   /   h   t   t   p   d nul
0000020

Or, for a satisfyingly refreshing self-reference:

[wally@zf images]$ od -c /proc/self/cmdline
0000000   o   d  \0   -   c  \0   /   p   r   o   c   /   s   e   l   f
0000020   /   c   m   d   l   i   n   e  \0
0000031