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Full Discussion: Beginners question about fork
Top Forums Programming Beginners question about fork Post 302373237 by jim mcnamara on Thursday 19th of November 2009 09:30:26 PM
Old 11-19-2009
Sending email using a command like mailx or sendmail requires a fork/exec on the child
side then wait on the parent side. This is exactly what the system() call does.

The alternative is to do what sendmail does in C code. system("/usr/bin/sendmail ... ") being infinitely simpler. IF you're sending 100K mail messages per day you should incorporate sendmail code, otherwise for a few dozen messages per day, consider system().

Start here to see what sendmail does, it is open source.

Code:
http://www.sendmail.org/

 

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LEARN ABOUT HPUX

fsdaemon

fsdaemon(1M)															      fsdaemon(1M)

NAME

       fsdaemon - pass-through daemon for processing system commands

SYNOPSIS

       fork]
DESCRIPTION

       The  is	a user level daemon that provides a mechanism to pass information between applications and common commands and library functional-
       ity, allowing certain applications to dynamically add functionality to a system.  This is currently only supported for the class  of  APIs,
       such as:

       The  API are not yet publicly available, but the commands that use the mentioned APIs depend on this daemon to always be running in the HP-
       UX environments.

   Options
       When	 is started, indicates whether it should fork a child process and exit the parent process or run just as the  parent  process  and
		 not return.  A value of 1 for fork will make fork and exec a child process and then cause the parent process to exit.

       Kills the current running instance of

       Tests and waits until
		 is ready to process commands.	There is a window where could be started and not yet setup to process commands.  The caller should
		 invoke separately with the option to block until is ready to process commands.

       The entries to start are in the file.  These entries be present to ensure correct functionality of the system.  They should appear  as  one
       of the first entries in placing entries before entries in is dangerous and unsupported.

       The following are some of the HP-UX commands that use via the above APIs: and

RETURN VALUE
:
	0   Successful start of If invoked with the option, 0 is always returned.

       >0   Errno of failure that caused to fail to start.  This applies only if was started with the option.

ERRORS

       If  is not running, the errno will be returned by an application that invokes these APIs.  If this happens, please see your system adminis-
       trator to make sure is properly running.

EXAMPLES

       To start such that it can be invoked without permanently blocking the calling process:

       To kill the currently running instance of

       To check to see if the currently running instance of is ready and able to process requests sent to it:

       The following entries for starting should appear in the file:

WARNINGS

       The APIs are not yet publicly available, but the commands that use the mentioned family of APIs depend on this daemon to always be  running
       on  HP-UX  environments.  The administrator is not expected to invoke the command from the shell prompt; it should always be started via an
       entry in

       This manpage is provided for administrator's trouble shooting purposes, and to allow the system administrator to  repair  the  entries  for
       this daemon in case of corruption.

       The interface/options provided in this manpage are HP-UX release specific, and may be different in future releases.

AUTHOR

       was developed by HP.

SEE ALSO

       fstyp(1M), mkboot(1M), mount(1M), fstatfsdev(3C), fstatvfsdev(3C), statvfsdev(3C), statfsdev(3C), inittab(4).

																      fsdaemon(1M)
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