Doug / smarc-fsl-linux-kernel

20 Feb, 2012

1 commit

  • 1dce27c5a   Wrap accesses to the fd_sets in struct fdtable ... Browse Code »

    Wrap accesses to the fd_sets in struct fdtable (for recording open files and
    close-on-exec flags) so that we can move away from using fd_sets since we
    abuse the fd_set structs by not allocating the full-sized structure under
    normal circumstances and by non-core code looking at the internals of the
    fd_sets.

    The first abuse means that use of FD_ZERO() on these fd_sets is not permitted,
    since that cannot be told about their abnormal lengths.

    This introduces six wrapper functions for setting, clearing and testing
    close-on-exec flags and fd-is-open flags:

    void __set_close_on_exec(int fd, struct fdtable *fdt);
    void __clear_close_on_exec(int fd, struct fdtable *fdt);
    bool close_on_exec(int fd, const struct fdtable *fdt);
    void __set_open_fd(int fd, struct fdtable *fdt);
    void __clear_open_fd(int fd, struct fdtable *fdt);
    bool fd_is_open(int fd, const struct fdtable *fdt);

    Note that I've prepended '__' to the names of the set/clear functions because
    they require the caller to hold a lock to use them.

    Note also that I haven't added wrappers for looking behind the scenes at the
    the array. Possibly that should exist too.

    Signed-off-by: David Howells
    Link: http://lkml.kernel.org/r/20120216174942.23314.1364.stgit@warthog.procyon.org.uk
    Signed-off-by: H. Peter Anvin
    Cc: Al Viro

    David Howells
     

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1 commit

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1 commit