getgid, getegid - Get the group ID of the calling process
void ); gid_t getegid(
Application developers may want to specify an #include statement for
<sys/types.h> before the one for <unistd.h> if programs are being
developed for multiple platforms. The additional #include statement is
not required on Tru64 UNIX systems or by ISO or Open Group specifica‐
tions, but might be required on other vendors' systems that conform to
Interfaces documented on this reference page conform to industry stan‐
dards as follows:
getgid(), getegid(): POSIX.1, XSH4.0, XSH4.2, XSH5.0
Refer to the standards(5) reference page for more information about
industry standards and associated tags.
The getgid() function returns the real group ID of the calling process.
The getegid() function returns the effective group ID of the calling
The real group ID is specified at login time. The effective group ID is
more transient, and determines additional access permission during exe‐
cution of a ``set-group-ID'' process. It is for such processes that
the getgid() function is most useful.
The getgid() and getegid() functions return the requested group ID.
They are always successful.
Functions: getgroups(2), setgroups(2), setregid(2), initgroups(3)