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authorThomas Gleixner <tglx@linutronix.de>2008-08-31 17:09:53 +0200
committerArjan van de Ven <arjan@linux.intel.com>2008-09-06 06:34:57 +0200
commitdf0cc0539b4127bd02f64de2c335b4af1fdb3845 (patch)
tree2ba23487a2a6c37cfdcd1f5c9edb31a5e0b0df22 /include
parentselect: Introduce a hrtimeout function (diff)
downloadlinux-df0cc0539b4127bd02f64de2c335b4af1fdb3845.tar.xz
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select: add a timespec_add_safe() function
For the select() rework, it's important to be able to add timespec structures in an overflow-safe manner. This patch adds a timespec_add_safe() function for this which is similar in operation to ktime_add_safe(), but works on a struct timespec. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Diffstat (limited to 'include')
-rw-r--r--include/linux/time.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/time.h b/include/linux/time.h
index e15206a7e82e..726976478480 100644
--- a/include/linux/time.h
+++ b/include/linux/time.h
@@ -38,6 +38,8 @@ struct timezone {
#define NSEC_PER_SEC 1000000000L
#define FSEC_PER_SEC 1000000000000000L
+#define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1)
+
static inline int timespec_equal(const struct timespec *a,
const struct timespec *b)
{
@@ -72,6 +74,8 @@ extern unsigned long mktime(const unsigned int year, const unsigned int mon,
const unsigned int min, const unsigned int sec);
extern void set_normalized_timespec(struct timespec *ts, time_t sec, long nsec);
+extern struct timespec timespec_add_safe(const struct timespec lhs,
+ const struct timespec rhs);
/*
* sub = lhs - rhs, in normalized form