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GETGID(2) System Calls Manual GETGID(2)

getgid, getegidget group process identification

library “libc”

#include <unistd.h>

gid_t
getgid(void);

gid_t
getegid(void);

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

getuid(2), setgid(2), setgroups(2), setregid(2)

getgid() and getegid() conform to IEEE Std 1003.1-1990 (“POSIX.1”).

The getgid() function appeared in Version 4 AT&T UNIX.

April 3, 2010 NetBSD-7.0.1