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From: "dmalcolm at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug analyzer/106299] New: RFE: analyzer handling of fdopen
Date: Thu, 14 Jul 2022 14:46:56 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106299

            Bug ID: 106299
           Summary: RFE: analyzer handling of fdopen
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: analyzer
          Assignee: dmalcolm at gcc dot gnu.org
          Reporter: dmalcolm at gcc dot gnu.org
            Blocks: 106003
  Target Milestone: ---

Now that the analyzer supports checking both filedescriptor *and* FILE * us=
age,
we should probably add special-case handling of fdopen:

  https://www.man7.org/linux/man-pages/man3/fdopen.3p.html

I'm not quite sure how to model the interaction between the two state machi=
nes;
perhaps a successful fdopen on a fd should transition the fd from an open s=
tate
to the "stop" state (i.e. stop tracking state on this fd), and transition t=
he
FILE * from the start state to the open state.

See also bug 101550, which has an example of using fdopen.


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106003
[Bug 106003] RFE: -fanalyzer could complain about misuse of file-descriptor=
s=