08-21-2002
child process hang up, help!!!
Hi all,
There is a pearent process with 3 child processes, they work perfect. Pearent process read from file and separate data by blocks and send it to child processes, after that pearent read the result of work and just print it out to standart output. All interprocess communication maded through pipe and synchronized over signals. The problem is that when the standart output printed through MORE (x | more) and by output anybody type "q", the pearent process will be terminated but child processes will go to sleep mode forever. Can enybody help me with this? Thanks for any help!
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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