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author | David Howells <dhowells@redhat.com> | 2012-02-16 17:49:42 +0000 |
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committer | H. Peter Anvin <hpa@zytor.com> | 2012-02-19 10:30:52 -0800 |
commit | 1dce27c5aa6770e9d195f2bb7db1db3d4dde5591 (patch) | |
tree | 4ad3ffeee95cb5b10e047b7cb9bdbb48cfc734e0 /Kconfig | |
parent | 8b3d1cda4f5ff0d7c2ae910ea8fd03493996912f (diff) | |
download | linux-1dce27c5aa6770e9d195f2bb7db1db3d4dde5591.tar.bz2 |
Wrap accesses to the fd_sets in struct fdtable
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 <dhowells@redhat.com>
Link: http://lkml.kernel.org/r/20120216174942.23314.1364.stgit@warthog.procyon.org.uk
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'Kconfig')
0 files changed, 0 insertions, 0 deletions