GETGID(2) BSD System Calls Manual GETGID(2)NAME
getgid, getegid -- get group process identification
Standard C Library (libc, -lc)
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 dur-
ing 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.
SEE ALSO getuid(2), setgid(2), setgroups(2), setregid(2)STANDARDS
getgid() and getegid() conform to ISO/IEC 9945-1:1990 (``POSIX.1'').
The getgid() function appeared in Version 4 AT&T UNIX.
BSD April 3, 2010 BSD
Check Out this Related Man Page
getgid(2) System Calls Manual getgid(2)NAME
getgid, getegid - Gets the process group ID
gid_t getgid (void);
gid_t getegid (void);
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 X/Open standards,
but may be required on other vendors' systems that conform to these standards.
Interfaces documented on this reference page conform to industry standards as follows:
getgid(), getegid(): POSIX.1, XPG4, XPG4-UNIX
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 process.
The real group ID is specified at login time. The effective group ID is more transient, and determines additional access permission during
execution 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), initgroups(3), setgroups(2), setregid(2)
Standards: standards(5) delim off
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