Supported File Systems

Both advisory and mandatory locking are supported on the following types of file systems:

• ufs--the default disk-based file system

• fifofs--a pseudo file system of named pipe files that give processes common access to data.

• namefs--a pseudo file system used mostly by STREAMS for dynamic mounts of file descriptors on top of files.

• specfs--a pseudo file system that provides access to special character and block devices.

  Only advisory file locking is supported on NFS.

  File locking is not supported for the proc and fd file systems.