WaitPid

Wait for a process to terminate

Declaration

Source position: linuxold.inc line 1354

Description

WaitPid waits for a child process with process ID Pid to exit. The value of Pid can be one of the following:

Pid < -1

Causes WaitPid to wait for any child process whose process group ID equals the absolute value of pid.

Pid = -1

Causes WaitPid to wait for any child process.

Pid = 0

Causes WaitPid to wait for any child process whose process group ID equals the one of the calling process.

Pid > 0

Causes WaitPid to wait for the child whose process ID equals the value of Pid.

The Options parameter can be used to specify further how WaitPid behaves:

WNOHANG

Causes Waitpid to return immediately if no child hasexited.

WUNTRACED

Causes WaitPid to return also for children which are stopped, but whose status has not yet been reported.

__WCLONE

Causes WaitPid also to wait for threads created by the Clone call.

Upon return, it returns the exit status of the process, or -1 in case of failure.

For an example, see Fork.

Errors

Errors are returned in LinuxError.

See also