gid_t
getgid(
void
)
gid_t
getegid(
void
)
)
function returns the real group ID of the calling process,
getegid(
)
returns the effective group ID of the calling process.
The real group ID is specified at login time.
The real group ID is the group of the user who invoked the program.
As the effective group ID gives the process additional permissions
during the execution of
``set-group-ID''
mode processes,
getgid()
is used to determine the real-group-id of the calling process.
)
and
getegid(
)
functions are always successful, and no return value is reserved to
indicate an error.
)
and
getegid(
)
conform to
ISO/IEC 9945-1:1990 (``POSIX.1'') .