06-20-2013
Quote:
Originally Posted by
RudiC
@Don Cragun: Right, I should have known better / read the man.
Still you could find the PID using ps, and then check for the existence of your BIP process. Or, have bip.sh report that PID back.
Yes, bip.sh could report the PID back to the caller, but the caller still can't use the wait utility to wait for it to terminate. The caller could repeatedly search ps command output to determine when the grandchild has terminated. But an invocation of wait with the PID of the grandchild as an operand will yield an exit code of 127 from wait indicating that the grandchild is not known to the current shell (i.e., the underlying waitpid() call generated an ECHILD error).
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WAIT(1) BSD General Commands Manual WAIT(1)
NAME
wait -- await process completion
SYNOPSIS
wait [pid]
DESCRIPTION
If invoked with no arguments, the wait utility waits until all existing child processes in the background have terminated.
Available operands:
pid If a pid operand is specified, and it is the process ID of a background child process that still exists, the wait utility waits until
that process has completed and consumes its status information, without consuming the status information of any other process.
If a pid operand is specified that is not the process ID of a child background process that still exists, wait exits without waiting
for any processes to complete.
The wait utility exits with one of the following values:
0 The wait utility was invoked with no operands and all of the existing background child processes have terminated, or the process
specified by the pid operand exited normally with 0 as its exit status.
>0 The specified process did not exist and its exit status information was not available, or the specified process existed or its exit
status information was available, and it terminated with a non-zero exit status.
If the specified process terminated abnormally due to the receipt of a signal, the exit status information of wait contains that termination
status as well.
STANDARDS
The wait command is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible.
BSD
June 5, 1993 BSD