Mac os x launchd config
There are two main components in the launchd service creating process that you will need to follow. The behavior of a daemons or agents are defined in a special XML file called a property list. Depending on where it is stored it will be treated as a daemon or an agent. Services Daemons and Agents are saved as. Please refer launchd. This section will define how to obtain information about launchd services and how to load, unload, start and stop those jobs.
All of this can be accomplished using the command line utility launchctl. Some of the popular commands in launchctl are defined in the below. To check the status of the job run the following command and you will able to observe need information about the jobs as given in the image. Run following commands to stop the running process and unload the daemon service from launchd framework.
Therefore, with the understanding of the simple example of the launchd framework now you can use launchd to create scripts that do things like clean up files, control application servers on a schedule or run an application when a certain file appears. More details on launchd framework and launchctl utility:.
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Meanwhile crontab will not. First thing to do is create a script to run. For the sake of this example, all this script is going to do is log the time when it was run. Now we need to create a launchd configuration plist file. Paste this code in there. This file specifies a few things:. There are a bunch of other options you can read about here.
A commonly used option is the KeepAlive option which will restart your script whenever it ends or crashes. This is useful if you want your script to always be running. These adjust variables set with setrlimit 2. Setting this value in a system wide daemon will set the sysctl 3 kern. This imposes a limit on the amount of physical memory to be given to a process; if memory is tight, the system will prefer to take memory from processes that are exceeding their declared resident set size.
Stack extension is performed automatically by the system. The system will apply resource limits based on what kind of job it is. The following are valid values: Background Background jobs are generally processes that do work that was not directly requested by the user. The resource limits applied to Background jobs are intended to prevent them from disrupting the user experience.
Standard Standard jobs are equivalent to no ProcessType being set. Adaptive Adaptive jobs move between the Background and Interactive classifi- cations based on activity over XPC connections. Interactive Interactive jobs run with the same resource limitations as apps, that is to say, none.
Permissions and Security
Interactive jobs are critical to maintaining a responsive user experience, and this key should only be used if an app's ability to be responsive depends on it, and cannot be made Adaptive. Setting this key to true disables that behavior. In other words, if the job cannot be safely respawned without a full machine reboot, then set this key to be true. Each key in this dictionary should be the name of service to be advertised.
The value of the key must be a boolean and set to true. Alternatively, a dictionary can be used instead of a simple true value.
A Simple Launchd Tutorial
If the value is set to true, clients receive port death notifications when the job lets go of the receive right. Setting the value to true should be done with care. Not all clients may be able to han- dle this behavior. The default value is false. Finally, for the job itself, the values will be replaced with Mach ports at the time of check-in with launchd. OR dictionary of array of dictionaries The job must check-in to get a copy of the file descriptors using APIs outlined in launch 3.
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The keys of the top level Sockets dictionary can be anything. They are meant for the application developer to use to differentiate which descriptors correspond to which application level protocols e. At check-in time, the value of each Sockets dictionary key will be an array of descriptors. The parameters below are used as inputs to call getaddrinfo 3. The default is "stream" and other valid values for this key are "dgram" and "seqpacket" respectively.
The default is true "to listen".
The only value understood by this key at the moment is "TCP". It specifies the path to connect 2 or bind 2 to.