diff options
Diffstat (limited to 'lib/libc/sys/flock.2')
| -rw-r--r-- | lib/libc/sys/flock.2 | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/lib/libc/sys/flock.2 b/lib/libc/sys/flock.2 index 1d095bd..acb9741 100644 --- a/lib/libc/sys/flock.2 +++ b/lib/libc/sys/flock.2 @@ -93,7 +93,8 @@ after other processes have gained and released the lock). .Pp Requesting a lock on an object that is already locked normally causes the caller to be blocked until the lock may be -acquired. If +acquired. +If .Dv LOCK_NB is included in .Fa operation , @@ -102,13 +103,15 @@ the error .Er EWOULDBLOCK will be returned. .Sh NOTES -Locks are on files, not file descriptors. That is, file descriptors +Locks are on files, not file descriptors. +That is, file descriptors duplicated through .Xr dup 2 or .Xr fork 2 do not result in multiple instances of a lock, but rather multiple -references to a single lock. If a process holding a lock on a file +references to a single lock. +If a process holding a lock on a file forks and the child explicitly unlocks the file, the parent will lose its lock. .Pp |
