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Update nsenter README 

Signed-off-by: Peng Gao <peng.gao.dut@gmail.com>
This commit is contained in:
Peng Gao 2016-05-14 22:37:46 +08:00
parent c6a791bef9
commit b7219cc2b3
1 changed files with 2 additions and 2 deletions
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4
libcontainer/nsenter/README.md
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@ -10,8 +10,8 @@ The `nsenter` package will `import "C"` and it uses [cgo](https://golang.org/cmd
package. In cgo, if the import of "C" is immediately preceded by a comment, that comment,
called the preamble, is used as a header when compiling the C parts of the package.
So every time we import package `nsenter`, the C code function `nsexec()` would be
called. And package `nsenter` is now only imported in Docker execdriver, so every time
before we call `execdriver.Exec()`, that C code would run.
called. And package `nsenter` is now only imported in `main_unix.go`, so every time
before we call `cmd.Start` on linux, that C code would run.
`nsexec()` will first check the environment variable `_LIBCONTAINER_INITPID`
which will give the process of the container that should be joined. Namespaces fd will