setregid - Sets the real and effective group ID
gid_t egid );
Interfaces documented on this reference page conform to industry standards as follows:
Refer to the standards(5) reference page for more information about industry standards and associated tags.
Specifies the new real group ID. Specifies the new effective group ID.
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.
Upon successful completion, a value of 0 (zero) is returned. Otherwise, a value of -1 is returned and errno is set to indicate the error.
The setregid() function sets errno to the specified values for the following 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 specified.
Functions: getgid(2), setgid(2), setrgid(3), setreuid(2)
Standards: standards(5) delim off