[Bug stdio/20598] New: fork clobbers file offsets

["schwab at linux-m68k dot org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=20598

            Bug ID: 20598
           Summary: fork clobbers file offsets
           Product: glibc
           Version: 2.22
            Status: NEW
          Severity: normal
          Priority: P2
         Component: stdio
          Assignee: unassigned at sourceware dot org
          Reporter: schwab@linux-m68k.org
                CC: ppluzhnikov at google dot com
            Blocks: 16734
  Target Milestone: ---

Created attachment 9507
  --> https://sourceware.org/bugzilla/attachment.cgi?id=9507&action=edit
Testcase

When a process calls fork while some stdio streams open the underlying file
offsets are modified in the child causing the parent to read from the wrong
offset on the next buffer underflow.  This was broken by commit
18d26750dd8fd328a78cf639fd0ec2494680a2a4.


Referenced Bugs:

https://sourceware.org/bugzilla/show_bug.cgi?id=16734
[Bug 16734] fopen calls mmap to allocate its buffer
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