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[Bug nptl/4465] New: pthread cancellation points missing for fdatasync and lockf in some cases


POSIX requires fdatasync() and lockf() be pthread cancellation endpoints but it
looks like they get missed a little in glibc ...

fdatasync() is generated for Linux simply via syscalls.list as a pass through to
the kernel... the generic case in misc/fdatasync.c relies on fsync() being a
cancellation endpoint ... so here, just Linux is broken it seems

as for lockf(), this seems to be [incorrectly] done on purpose ... io/lockf.c
talks about relying on fcntl()'s cancellation endpoint when called with F_SETLKW
as that is the only case that POSIX says fcntl() should be a cancellation
endpoint ... however, POSIX does not grant this limitation to lockf() ... it
should always be a cancellation endpoint regardless of the arguments it is
called with

-- 
           Summary: pthread cancellation points missing for fdatasync and
                    lockf in some cases
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: nptl
        AssignedTo: drepper at redhat dot com
        ReportedBy: vapier at gentoo dot org
                CC: glibc-bugs at sources dot redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=4465

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