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由 Alex Crichton 提交于
This commit starts to set the CLOEXEC flag for all files and sockets opened by the standard library by default on all unix platforms. There are a few points of note in this commit: * The implementation is not 100% satisfactory in the face of threads. File descriptors only have the `F_CLOEXEC` flag set *after* they are opened, allowing for a fork/exec to happen in the middle and leak the descriptor. Some platforms do support atomically opening a descriptor while setting the `CLOEXEC` flag, and it is left as a future extension to bind these apis as it is unclear how to do so nicely at this time. * The implementation does not offer a method of opting into the old behavior of not setting `CLOEXEC`. This will possibly be added in the future through extensions on `OpenOptions`, for example. * This change does not yet audit any Windows APIs to see if the handles are inherited by default by accident. This is a breaking change for users who call `fork` or `exec` outside of the standard library itself and expect file descriptors to be inherted. All file descriptors created by the standard library will no longer be inherited. [breaking-change]
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