Re: What is a successful return status for perl wait() in Solaris?

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Re^2: What is a successful return status for perl wait() in Solaris? by friedo (Prior) on Feb 01, 2008 at 14:32 UTC
The return value is the PID. $? is the exit status of the child process. The reason why the OP is getting 256 is explained in perlvar (the entry for $?): The status returned by the last pipe close, backtick (``) command, successful call to wait() or waitpid(), or from the system() operator. This is just the 16-bit status word returnedby the wait() system call (or else is made up to look like it). Thus, the exit value of the subprocess is really ("$? >> 8"), and "$? & 127" gives which signal, if any, the process died from, and "$? & 128" reports whether there was a core dump. (Mnemonic: similar to sh and ksh.)	[reply]
Re^2: What is a successful return status for perl wait() in Solaris? by almut (Canon) on Feb 01, 2008 at 14:31 UTC
I think it's rather (citing "`perldoc -f wait`"): ...it waits for a child process to terminate and returns the pid of the deceased process, or "-1" if there are no child processes. The status is returned in $?. See `man 2 wait` on how to interpret the return status. Also, `perldoc -f system` has some sample code for properly handling $?.	[reply] [d/l] [select]
Re^2: What is a successful return status for perl wait() in Solaris? by kduong (Initiate) on Feb 01, 2008 at 14:30 UTC
wait() return the pid, but $? returns the return status. For example: $a = wait(); $a is the pid and $? is the return status.	[reply]