Ubuntu Manpages

getgid, getegid

get group identity

#include <unistd.h>
#include <sys/types.h>

gid_t getgid(void);
gid_t getegid(void);

getgid() returns the real group ID of the calling process.

getegid() returns the effective group ID of the calling process.

These functions are always successful.

POSIX.1-2001, POSIX.1-2008, 4.3BSD.

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.

getresgid(2), setgid(2), setregid(2), credentials(7)

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