Enum PidLockError 

pub enum PidLockError {
    AlreadyHeld {
        datadir: PathBuf,
        pid: Option<u32>,
    },
    SetupFailed {
        datadir: PathBuf,
        source: Error,
    },
}

Errors from constructing a pid-lock-based LockManager (pid_flock::FlockPidLockManager or pid_fcntl::FcntlPidLockManager).

Pattern-match on this when you want to surface “another process is already using this datadir” differently from setup-failure cases.

Variants

AlreadyHeld

Another instance — same process or otherwise — already holds the pid lock for this datadir. The pid is the value that instance wrote into the LOCK file (best-effort; may be absent or stale).

Fields

datadir: PathBuf

pid: Option<u32>

SetupFailed

Anything else that went wrong setting up the datadir or opening the lock file (filesystem permission, ENOENT, etc.).

Fields

datadir: PathBuf

source: Error

Trait Implementations

impl Debug for PidLockError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for PidLockError

fn fmt(&self, __formatter: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Error for PidLockError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.