getegid32 (2) Linux Manual Page
getgid, getegid – get group identity
Synopsis
#include <unistd.h>#include <sys/types.h>
gid_t getgid(void);
gid_t getegid(void);
Description
getgid() returns the real group ID of the calling process. getegid() returns the effective group ID of the calling process.
Errors
These functions are always successful.Conforming To
POSIX.1-2001, POSIX.1-2008, 4.3BSD.Notes
The original Linux getgid() and getegid() system calls supported only 16-bit group IDs. Subsequently, Linux 2.4 added getgid32() and getegid32(), supporting 32-bit IDs. The glibc getgid() and getegid() wrapper functions transparently deal with the variations across kernel versions. On Alpha, instead of a pair of getgid() and getegid() system calls, a single getxgid() system call is provided, which returns a pair of real and effective GIDs. The glibc getgid() and getegid() wrapper functions transparently deal with this. See syscall(2) for details regarding register mapping.