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Document setgroups call caused by std::os::unix::process::CommandExt.uid #90292

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Document setgroups call caused by std::os::unix::process::CommandExt.uid #90292

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8 changes: 8 additions & 0 deletions library/std/src/os/unix/process.rs
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Expand Up @@ -21,6 +21,14 @@ pub trait CommandExt: Sealed {
/// Sets the child process's user ID. This translates to a
/// `setuid` call in the child process. Failure in the `setuid`
/// call will cause the spawn to fail.
///
/// # Notes
///
/// This will also trigger a call to `setgroups(0, NULL)` in the
/// child process if the parent is root and no groups have been
/// specified.
/// This removes supplementary groups that might have given the child
/// unwanted permissions.
#[stable(feature = "rust1", since = "1.0.0")]
fn uid(
&mut self,
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