tree 6e56919829118d5aa6aa89991edaba764825fab2
parent 1c72d46d98e4eb16f1a1b38eba94cc3aa8022cfa
author Jesper Juhl <juhl-lkml@dif.dk> 1114963153 -0700
committer Linus Torvalds <torvalds@ppc970.osdl.org> 1114963153 -0700

[PATCH] new valid_signal() function

This patch adds a new function valid_signal() that tests if its argument is
a valid signal number.

The reasons for adding this new function are:

- some code currently testing _NSIG directly has off-by-one errors.
  Using this function instead avoids such errors.

- some code currently tests unsigned signal numbers for <0 which is
  pointless and generates warnings when building with gcc -W.  Using this
  function instead avoids such warnings.

I considered various places to add this function but eventually settled on
include/linux/signal.h as the most logical place for it.  If there's some
reason this is a bad choice then please let me know (hints as to a better
location are then welcome of course).

Signed-off-by: Jesper Juhl <juhl-lkml@dif.dk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>