qpsmtpd-prefork(8) [debian man page]

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)

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FORK(2) 							System Calls Manual							   FORK(2)

NAME

       fork - create a new process

SYNOPSIS

       pid = fork()
       int pid;

DESCRIPTION

       Fork causes creation of a new process.  The new process (child process) is an exact copy of the calling process except for the following:

	    The child process has a unique process ID.

	    The child process has a different parent process ID (i.e., the process ID of the parent process).

	    The child process has its own copy of the parent's descriptors.  These descriptors reference the same underlying objects, so that, for
	    instance, file pointers in file objects are shared between the child and the parent, so that an lseek(2) on a descriptor in the  child
	    process  can affect a subsequent read or write by the parent.  This descriptor copying is also used by the shell to establish standard
	    input and output for newly created processes as well as to set up pipes.

	    The child processes resource utilizations are set to 0; see setrlimit(2).

RETURN VALUE

       Upon successful completion, fork returns a value of 0 to the child process and returns the process ID of the child process  to  the  parent
       process.   Otherwise, a value of -1 is returned to the parent process, no child process is created, and the global variable errno is set to
       indicate the error.

ERRORS

       Fork will fail and no child process will be created if one or more of the following are true:

       [EAGAIN]       The system-imposed limit on the total number of processes under execution would be exceeded.  This limit	is  configuration-
		      dependent.

       [EAGAIN]       The  system-imposed limit MAXUPRC (<sys/param.h>) on the total number of processes under execution by a single user would be
		      exceeded.

       [ENOMEM]       There is insufficient swap space for the new process.

SEE ALSO

       execve(2), wait(2)

3rd Berkeley Distribution					   May 22, 1986 							   FORK(2)

Linux and UNIX Man Pages

qpsmtpd-prefork(8) [debian man page]

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