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perm/irusrconstant
perm/iwusrconstant
perm/ixusrconstant
perm/irgrpconstant
perm/iwgrpconstant
perm/ixgrpconstant
perm/irothconstant
perm/iwothconstant
perm/ixothconstant
perm/irwxuconstant
perm/irwxgconstant
perm/irwxoconstant
perm/isvtxconstant
perm/isuidconstant
perm/isgidconstant

Permission bits used with, for example, file-open.

NOTE: On native Windows builds (all except cygwin), perm/isvtx, perm/isuid and perm/isgid are defined as zero because the corresponding permission doesn't exist. This means you can safely add these to any set of flags when opening a file or pipe, but it simply won't have an effect.