October 7, 2006 GETGID 2

### NAME

getgid, getegid - get group process identification

### LIBRARY

Standard C Library (libc, -lc)

### SYNOPSIS

```gid_t` getgid(```void`)
```gid_t` getegid(```void`)

### DESCRIPTION

The getgid(``) 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.

### ERRORS

The getgid(``) and getegid(``) functions are always successful, and no return value is reserved to indicate an error.

### SEE ALSO

getuid(2), setgid(2), setgroups(2), setregid(2)

### STANDARDS

getgid(``) and getegid(``) conform to ISO/IEC 9945-1:1990 (``POSIX.1'') .