$^F
The maximum system file descriptor, ordinarily 2. System file descriptors are passed to exec()
ed processes, while higher file descriptors are not. Also, during an open()
, system file descriptors are preserved even if the open()
fails (ordinary file descriptors are closed before the open()
is attempted). The close-on-exec status of a file descriptor will be decided according to the value of $^F
when the corresponding file, pipe, or socket was opened, not the time of the exec()
.
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