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Top Forums Programming Unix Shell background processing Post 302457768 by Corona688 on Tuesday 28th of September 2010 06:39:00 PM
Old 09-28-2010
Quote:
Originally Posted by Mercfh
So as to improve my learning, cause you explain why exactly this worked. wait() as I understand waits for any process to finish before moving on....so waitpid waits for the specific pid process to finish.......but aren't background processes specific to this pid too.
Every process has its own unique pid. By waiting for the PID you can wait for one specific process and no others.
Quote:
Also...I assume status really has no point except maybe in the sighandler.
You can get the function's return value with WEXITSTATUS(status). This is important to find out if a process returned success(0) or failure(anything else). You might want to make it the return value of your Execute function.
Quote:
I have no clue how you figured this out?
I remembered that this was leaving zombie processes around, so that what you were waiting for probably wasn't what you were getting.
 

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explain_waitpid_or_die(3)				     Library Functions Manual					 explain_waitpid_or_die(3)

NAME
explain_waitpid_or_die - wait for process to change state and report errors SYNOPSIS
#include <libexplain/waitpid.h> int pid = explain_waitpid_or_die(int pid, int *status, int options); DESCRIPTION
The explain_waitpid_or_die function is used to call the waitpid(2) system call. On failure an explanation will be printed to stderr, obtained from explain_waitpid(3), and then the process terminates by calling exit(EXIT_FAILURE). This function is intended to be used in a fashion similar to the following example: explain_waitpid_or_die(pid, status, options); pid The pid, exactly as to be passed to the waitpid(2) system call. status The status, exactly as to be passed to the waitpid(2) system call. options The options, exactly as to be passed to the waitpid(2) system call. Returns: This function only returns on success. On failure, prints an explanation and exits. SEE ALSO
waitpid(2) wait for process to change state explain_waitpid(3) explain waitpid(2) errors exit(2) terminate the calling process COPYRIGHT
libexplain version 0.52 Copyright (C) 2008 Peter Miller explain_waitpid_or_die(3)
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