June 2017
Intermediate to advanced
478 pages
13h 14m
English
Content preview from Mastering Embedded Linux Programming - Second Edition
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inittab
The init program begins by reading /etc/inttab, which contains entries that define what happens at each runlevel. The format is an extended version of BusyBox inittab that I described in the preceding section, which is not surprising because BusyBox borrowed it from System V in the first place.
The format of each line in inittab is as follows:
id:runlevels:action:process
The fields are shown here:
- id: A unique identifier of up to four characters.
- runlevels: The runlevels for which this entry should be executed. This was left blank in the BusyBox inittab
- action: One of the keywords given in the following paragraph.
- process: The command to run.
The actions are the same as for BusyBox init: sysinit, respawn, once, wait, restart
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