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Don't duplicate file descriptors into stdio fds #101426

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Sep 6, 2022
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Don't duplicate file descriptors into stdio fds #101426

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3 changes: 2 additions & 1 deletion library/std/src/os/fd/owned.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -104,7 +104,8 @@ impl BorrowedFd<'_> {
#[cfg(target_os = "espidf")]
let cmd = libc::F_DUPFD;

let fd = cvt(unsafe { libc::fcntl(self.as_raw_fd(), cmd, 0) })?;
// Avoid using file descriptors below 3 as they are used for stdio
let fd = cvt(unsafe { libc::fcntl(self.as_raw_fd(), cmd, 3) })?;
Ok(unsafe { OwnedFd::from_raw_fd(fd) })
}

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