Don't duplicate file descriptors into stdio fds

2022-09-04 10:22:36 +01:00 · 2022-09-04 10:22:36 +01:00 · 0e0756cf0d
commit 0e0756cf0d
parent c2d140bd36
1 changed files with 2 additions and 1 deletions
--- a/library/std/src/os/fd/owned.rs
+++ b/library/std/src/os/fd/owned.rs
@ -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) })
    }