diff options
Diffstat (limited to 'usr/src/uts/common/sys/eventfd.h')
| -rw-r--r-- | usr/src/uts/common/sys/eventfd.h | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/usr/src/uts/common/sys/eventfd.h b/usr/src/uts/common/sys/eventfd.h index 1b0d961b0b..b64a101348 100644 --- a/usr/src/uts/common/sys/eventfd.h +++ b/usr/src/uts/common/sys/eventfd.h @@ -10,7 +10,7 @@ */ /* - * Copyright (c) 2015 Joyent, Inc. All rights reserved. + * Copyright (c) 2017, Joyent, Inc. */ /* @@ -47,6 +47,13 @@ typedef uint64_t eventfd_t; #define EVENTFDIOC (('e' << 24) | ('f' << 16) | ('d' << 8)) #define EVENTFDIOC_SEMAPHORE (EVENTFDIOC | 1) /* toggle sem state */ +/* + * Kernel-internal method to write to eventfd while bypassing overflow limits, + * therefore avoiding potential to block as well. This is used to fulfill AIO + * behavior in LX related to eventfd notification. + */ +#define EVENTFDIOC_POST (EVENTFDIOC | 2) + #ifndef _KERNEL extern int eventfd(unsigned int, int); @@ -58,6 +65,7 @@ extern int eventfd_write(int, eventfd_t); #define EVENTFDMNRN_EVENTFD 0 #define EVENTFDMNRN_CLONE 1 #define EVENTFD_VALMAX (ULLONG_MAX - 1ULL) +#define EVENTFD_VALOVERFLOW ULLONG_MAX #endif /* _KERNEL */ |