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GETGID(2) FreeBSD System Calls Manual GETGID(2)
NAME getgid, getegid - get group process identification
LIBRARY Standard C Library (libc, -lc)
SYNOPSIS #include <unistd.h>
gid_t getgid(void);
gid_t getegid(void);
DESCRIPTION The getgid() system call 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-user-id of the calling process.
ERRORS The getgid() and getegid() system calls are always successful, and no return value is reserved to indicate an error.
SEE ALSO getuid(2), issetugid(2), setgid(2), setregid(2)
STANDARDS The getgid() and getegid() system calls are expected to conform to IEEE Std 1003.1-1990 ("POSIX.1").
HISTORY The getgid() function appeared in Version 4 AT&T UNIX.
FreeBSD 14.0-RELEASE-p6 May 1, 2020 FreeBSD 14.0-RELEASE-p6