View source code
Display the source code in std/process.d from which this page was generated on github.
Report a bug
If you spot a problem with this page, click here to create a Bugzilla issue.
Improve this page
Quickly fork, edit online, and submit a pull request for this page. Requires a signed-in GitHub account. This works well for small changes. If you'd like to make larger changes you may want to consider using local clone.

Function std.process.wait

Waits for the process associated with pid to terminate, and returns its exit status.

int wait (
  Pid pid
) @safe;

In general one should always wait for child processes to terminate before exiting the parent process unless the process was spawned as detached (that was spawned with Config.detached flag). Otherwise, they may become "zombies" – processes that are defunct, yet still occupy a slot in the OS process table. You should not and must not wait for detached processes, since you don't own them.

If the process has already terminated, this function returns directly. The exit code is cached, so that if wait() is called multiple times on the same Pid it will always return the same value.

POSIX specific

If the process is terminated by a signal, this function returns a negative number whose absolute value is the signal number. Since POSIX restricts normal exit codes to the range 0-255, a negative return value will always indicate termination by signal. Signal codes are defined in the core.sys.posix.signal module (which corresponds to the signal.h POSIX header).


ProcessException on failure or on attempt to wait for detached process.


See the spawnProcess documentation.

See also

tryWait, for a non-blocking function.


Lars Tandle Kyllingstad, Steven Schveighoffer, Vladimir Panteleev


Boost License 1.0.