Is it possible to get the return address in a system call function?

[Xin Zhao <uszhaoxin@gmail.com>]

Let me clarify with an example: 

test.c:

******
open("abc.txt", O_RDONLY);
i ++;

Apparently, after the system call  "open" in the kernel, the system
will return to the instruction "i++".  My question is: can we find out
the instruction pointer in  sys_open? If so, how?

Thanks!

xin
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