Originální popis anglicky:
getgid, getegid - get group identity
Návod, kniha: Linux Programmer's Manual
#include <unistd.h>
#include <sys/types.h>
gid_t getgid(void);
gid_t getegid(void);
getgid returns the real group ID of the current process.
getegid returns the effective group ID of the current process.
The real ID corresponds to the ID of the calling process. The effective ID
corresponds to the set ID bit on the file being executed.
These functions are always successful.
POSIX, BSD 4.3
setgid(2),
setregid(2)
