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GETGID(2) System Calls Manual GETGID(2)

getgid, getegid
get group process identification

#include <unistd.h>
gid_t
getgid(void);
gid_t
getegid(void);

The getgid() function returns the real group ID of the calling process and the getegid() function 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.

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

getgroups(2), getresgid(2), getuid(2), setgid(2), setregid(2)

The getgid() and getegid() functions conform to IEEE Std 1003.1-2008 (“POSIX.1”).

The getgid() system call first appeared in Version 4 AT&T UNIX, and getegid() in Version 7 AT&T UNIX.
September 10, 2015 OpenBSD-current