BSD 2.11 - man page for setregid (bsd section 2)
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setregid - set real and effective group ID
int rgid, egid;
The real and effective group ID's of the current process are set to the arguments.
Unprivileged users may change the real group ID to the effective group ID and vice-versa;
only the super-user may make other changes.
Supplying a value of -1 for either the real or effective group ID forces the system to
substitute the current ID in place of the -1 parameter.
Upon successful completion, a value of 0 is returned. Otherwise, a value of -1 is
returned and errno is set to indicate the error.
[EPERM] The current process is not the super-user and a change other than changing
the effective group-id to the real group-id was specified.
getgid(2), setreuid(2), setgid(3)
4.2 Berkeley Distribution May 15, 1985 SETREGID(2)
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