diff options
Diffstat (limited to 'lib/libc/sys/flock.2')
| -rw-r--r-- | lib/libc/sys/flock.2 | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/lib/libc/sys/flock.2 b/lib/libc/sys/flock.2 index 3cfc7cc423c2..1d095bdf3eba 100644 --- a/lib/libc/sys/flock.2 +++ b/lib/libc/sys/flock.2 @@ -112,6 +112,25 @@ 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 +The +.Fn flock , +.Xr fcntl 2 , +and +.Xr lockf 3 +locks are compatible. +Processes using different locking interfaces can cooperate +over the same file safely. +However, only one of such interfaces should be used within +the same process. +If a file is locked by a process through +.Fn flock , +any record within the file will be seen as locked +from the viewpoint of another process using +.Xr fcntl 2 +or +.Xr lockf 3 , +and vice versa. +.Pp Processes blocked awaiting a lock may be awakened by signals. .Sh RETURN VALUES .Rv -std flock @@ -141,8 +160,10 @@ refers to an object that does not support file locking. .Xr close 2 , .Xr dup 2 , .Xr execve 2 , +.Xr fcntl 2 , .Xr fork 2 , -.Xr open 2 +.Xr open 2 , +.Xr lockf 3 .Sh HISTORY The .Fn flock |