getgid, getegid - get group identity
#include <unistd.h>
#include <sys/types.h>
gid_t getgid(void);
gid_t getegid(void);
These functions are always successful.
POSIX.1-2001, POSIX.1-2008, 4.3BSD.
getresgid(2), setgid(2), setregid(2), credentials(7)
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