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NAME

     getgid, getegid - get group process identification

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <sys/types.h>
     #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
     ISO/IEC 9945-1:1990 (“POSIX.1”).