systemd switched-root的deserialize參數(shù)有什么用

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systemd --switched-root --deserialize的這兩個參數(shù)是內(nèi)部用的，用于源代碼中，不對外提供接口。

系統(tǒng)中可以通過ps命令來查看，為1號進(jìn)程：

實例1：

root          1  0.0  0.4  45808  4092 ?        Ss   Aug22   0:02 /usr/lib/systemd/systemd --system --deserialize 15

實例2：

root          1  0.0  0.4 128096  4144 ?        Ss   Aug22   0:02 /usr/lib/systemd/systemd --switched-root --system --deserialize 21

These are intentionally undocumented internal parts of systemd. Very simply, therefore:

• --deserialize is used to restore saved internal state that a previous invocation of systemd, exec()ing this one, has written out to a file. Its option argument is an open file descriptor for that process.

• --switched-root is used to tell this invocation of systemd that it has been invoked from systemd managing an initramfs, and so should behave accordingly — including turning off some of the behaviour otherwise caused by --deserialize.

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