|SETREGID(2)||System Calls Manual||SETREGID(2)|
setregid — set
real and effective group ID
Standard C Library (libc, -lc)
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.
function was intended to allow swapping the real and effective group IDs in
set-group-ID programs to temporarily relinquish the set-group-ID value. This
function did not work correctly; its purpose is now better served by the use
function (see setuid(2)).
When setting the real and effective group IDs to the
same value, the standard
function is preferred.
setregid() function returns the
value 0 if successful; otherwise the value -1 is returned and
the global variable errno is set to indicate the
setregid() system call appeared in
|April 16, 1994||macOS 14.1|