[Bug analyzer/106300] New: RFE: analyzer support for more ways of obtaining an open file descriptor

[dmalcolm at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106300

            Bug ID: 106300
           Summary: RFE: analyzer support for more ways of obtaining an
                    open file descriptor
           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: ---

Currently -fanalyzer special-cases "open" for obtaining a possibly-open file
descriptor (in sm-fd.cc).

We should probably support other ways of obtaining possibly-open file
descriptors, either by special-casing them, or via some new attribute:

creat()
  https://www.man7.org/linux/man-pages/man3/creat.3p.html

pipe() and friends:
  int pipe(int pipefd[2]);
  int pipe2(int pipefd[2], int flags);
  https://www.man7.org/linux/man-pages/man2/pipe.2.html

dup() and friends
  covered in bug 106298

fcntl()
  https://man7.org/linux/man-pages/man2/fcntl.2.html
  (though that's probably a deep rabbit-hole that we may not want to go down)

socket()
  https://www.man7.org/linux/man-pages/man3/socket.3p.html
  See also bug 106140.


Referenced Bugs:

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