From: Jesper Juhl Date: Sun, 1 May 2005 15:59:13 +0000 (-0700) Subject: [PATCH] new valid_signal() function X-Git-Tag: firefly_0821_release~42725^2~127 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=e5bdd883a189243541e7a132385580703b049102;p=firefly-linux-kernel-4.4.55.git [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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/include/linux/signal.h b/include/linux/signal.h index 78bfb266e4f7..0a98f5ec5cae 100644 --- a/include/linux/signal.h +++ b/include/linux/signal.h @@ -220,6 +220,12 @@ static inline void init_sigpending(struct sigpending *sig) INIT_LIST_HEAD(&sig->list); } +/* Test if 'sig' is valid signal. Use this instead of testing _NSIG directly */ +static inline int valid_signal(unsigned long sig) +{ + return sig <= _NSIG ? 1 : 0; +} + extern int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p); extern int __group_send_sig_info(int, struct siginfo *, struct task_struct *); extern long do_sigpending(void __user *, unsigned long);