pragmatism first

getresgid, getresuid, setresgid, setresuid

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This manual	Reference	Other manuals
setresgid(2freebsd)	referred by
setresgid(2freebsd)	refer to	getgid(2) \| getuid(2) \| issetugid(2freebsd) \| setgid(2) \| setresuid(2) \| setreuid(2) \| setuid(2)