|SETREGID(2)||System Calls Manual||SETREGID(2)|
LIBRARY¶Standard C Library (libc, -lc)
DESCRIPTION¶The real and effective group ID's of the current process are set to the arguments. If the real group ID is changed, the saved group ID is changed to the new value of the effective group ID.
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 argument.
setregid() system call 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 system call did not work
correctly, and its purpose is now better served by the use of the
setegid(2) system call.
When setting the real and effective group IDs to the same value,
setgid() system call 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 error.
- 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.
SEE ALSO¶getgid(2), issetugid(2), setegid(2), setgid(2), setuid(2)
setregid() system call appeared in 4.2BSD.
|April 16, 1994||Linux 4.9.0-9-amd64|