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setregid(2) System Calls Manual setregid(2) NAME setregid - Sets the real and effective group ID SYNOPSIS #include <unistd.h> setregid( gid_t rgid, gid_t egid ); STANDARDS Interfaces documented on this reference page conform to industry stan- dards as follows: setregid(): XPG4-UNIX Refer to the standards(5) reference page for more information about in- dustry standards and associated tags. PARAMETERS Specifies the new real group ID. Specifies the new effective group ID. DESCRIPTION The setregid() function sets the real group ID of the current process to the value specified by the rgid parameter, and sets the effective group ID to the value specified by the egid parameter. If the value of rgid is -1, the real group ID is not changed; if the value of egid is -1, the effective group ID is not changed. The real and effective group IDs may be set to different values in the same call. Unprivileged users may change the effective group ID to the real group ID; only the superuser may make other changes. Any supplementary group IDs of the calling process remain unchanged. RETURN VALUES Upon successful completion, a value of 0 (zero) is returned. Other- wise, a value of -1 is returned and errno is set to indicate the error. ERRORS The setregid() function sets errno to the specified values for the fol- lowing conditions: The value of the rgid egid parameter is invalid or out of range. The current process does not have superuser privilege and a change other than changing the effective group ID to the real group ID was speci- fied. RELATED INFORMATION Functions: getgid(2), setgid(2), setrgid(3), setreuid(2) Standards: standards(5) delim off setregid(2)