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Full Discussion: Wait for clones
Top Forums Programming Wait for clones Post 302579114 by jim mcnamara on Sunday 4th of December 2011 08:10:41 PM
Old 12-04-2011
clone() returns a threadid, not a pid.
clone() also shares a lot common resources, if you have 2.6.34 kernel, CLONE_NEWPID
will result in a new process address space, but the return value is still thread id.

clone was invented to do threading. Use fork() if you want to create a real child process.
If you want threads use the the pthread library - pthread_create() and dozens of associated calls. Do not use clone() like that.
 

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wait(1) 						      General Commands Manual							   wait(1)

NAME
wait - await process completion SYNOPSIS
[pid] DESCRIPTION
If no argument is specified, waits until all processes (started with of the current shell have completed, and reports on abnormal termina- tions. If a numeric argument pid is given and is the process ID of a background process, waits until that process has completed. Other- wise, if pid is not a background process, exits without waiting for any processes to complete. Because the system call must be executed in the parent process, the shell itself executes without creating a new process (see wait(2)). Command-Line Arguments supports the following command line arguments: The unsigned decimal integer process ID of a command, whose termination is to wait for. WARNINGS
Some processes in a 2-or-more-stage pipeline may not be children of the shell, and thus cannot be waited for. SEE ALSO
csh(1), ksh(1), sh-posix(1), sh(1), wait(2). STANDARDS CONFORMANCE
wait(1)
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