12-14-2011
I suppose a FILE* could be double buffered and use aio to move the data! Maybe I will write a lib! Double buffering (i/o in one buffer area while you memory write/read another buffer area) got seriously neglected in UNIX except within TCP sockets.
I have never used the 'cmd <<< word', being pretty close to 'echo word | cmd' or 'cmd <<!
word
!', and in this '<<<$(...)' case, takes data from stdout a to stdin b, which is normally a pipe's simple job.
I suppose that if all non-ENV shell variables of a session were in an mmap'd file, all sub-shells could see and change all variables. Of course, it might get a bit tricky with the locking and moving as things expand, soon becoming another heap in need of GC.
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LEARN ABOUT DEBIAN
qpsmtpd-prefork
qpsmtpd-prefork(8) System Manager's Manual qpsmtpd-prefork(8)
NAME
qpsmtpd-prefork - Preforkin server for qpsmtpd
SYNOPSIS
qpsmtpd-prefork [options]
DESCRIPTION
qpsmtpd-prefork is the qpsmtpd frontend script which binds to the SMTP TCP socket, and asynchronously forks new children in advance of new
connections.
OPTIONS
--port port
Binds to a specific port, instead of the default 2525.
--user user
On startup, switch to run as user instead of the starting user. Applies only when started as root (as is normal when listening on
port 25).
--limit-connections limit
Accept at most limit simultaneous connections. Inbound connections beyondthis limit will be deferred or refused.
--max-from-ip limit
Accept at most limit simultaneous connections from any given IP address; does not override --limit-connections, if set.
--children limit
Limit the total number of child processes to limit; once all children are handling requests, further connections are deferred.
--idle-children count
Keep count child processes available, subject to the upper bound given via --children. Specify 0 to disable preforking entirely.
--interface addr
Bind to the local address addr, instead of the default behavior of binding to all interfaces. Can be specified multiple times to
bind to more than one interface or local address.
--renice-parent delta
Adjust the priority of the parent process by delta, yielding more CPU time to other processes. The default is 5.
--detach
Detach from the controlling terminal at startup, to run as a standalone daemon. See also --pid-file.
--pid-file filename
Upon startup, and after daemonizing if applicable, write the process ID to filename, for use by sysvinit control scripts or similar
utilities.
--pretty-child
Update child process names within the process table.
--version
Print the qpsmtpd release version and exit.
--debug
Be somewhat more verbose about logging during startup (has no effect once fully started).
--help Display commandline help and exit.
AUTHOR
Copyright (c) 2006, SoftScan; based on qpsmtpd-forkserver by Ask Bjorn Hansen <ask@develooper.com>
http://smtpd.develooper.com/
qpsmtpd-prefork(8)