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Important This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here.

_stat Structure st_mode Field Constants 

#include <sys/stat.h>

These constants are used to indicate file type in the st_mode field of the _stat structure.

The bit mask constants are described below:

Constant Meaning


File type mask




Character special (indicates a device if set)




Read permission, owner


Write permission, owner


Execute/search permission, owner

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