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| author | Thomas Gleixner <tglx@linutronix.de> | 2008-08-31 08:09:53 -0700 |
|---|---|---|
| committer | Arjan van de Ven <arjan@linux.intel.com> | 2008-09-05 21:34:57 -0700 |
| commit | df0cc0539b4127bd02f64de2c335b4af1fdb3845 (patch) | |
| tree | 2ba23487a2a6c37cfdcd1f5c9edb31a5e0b0df22 /include/linux | |
| parent | 7bb67439bf6bd3782f07f1d7be1e63406453d5de (diff) | |
| download | linux-3.10-df0cc0539b4127bd02f64de2c335b4af1fdb3845.tar.gz linux-3.10-df0cc0539b4127bd02f64de2c335b4af1fdb3845.tar.bz2 linux-3.10-df0cc0539b4127bd02f64de2c335b4af1fdb3845.zip | |
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/linux')
| -rw-r--r-- | include/linux/time.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/time.h b/include/linux/time.h index e15206a7e82..72697647848 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 |