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Date: Sat, 18 Nov 2017 04:03:00 -0000
From: Joel Brobecker <brobecker@adacore.com>
To: Yubin Ruan <ablacktshirt@gmail.com>
Cc: gdb@sourceware.org
Subject: Re: how GDB use ptrace to return from a function
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> what break point events are common for X86?

IIRC, the breakpoint instruction on x86 is the int3 instruction.
It should generate a SIGTRAP upon execution, just like any user-
inserted breakpoints.

-- 
Joel