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NAME

       getgid, getegid - get group identity

SYNOPSIS

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

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

DESCRIPTION

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

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

       When  a normal program is executed, the effective and real group ID of the process are set
       to the group ID of the user executing the file.  When a set ID  program  is  executed  the
       real  group  ID  is  set  to  the  group  of  the  calling  user and the effective user ID
       corresponds to the set group ID bit on the file being executed.

ERRORS

       These functions are always successful.

CONFORMING TO

       POSIX.1-2001, 4.3BSD.

NOTES

       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.

SEE ALSO

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

COLOPHON

       This  page  is  part of release 3.35 of the Linux man-pages project.  A description of the
       project, and information about reporting bugs, can be found at  http://man7.org/linux/man-
       pages/.