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Linux 2.6 - man page for getgid (linux section 3)

GETGID(P)						     POSIX Programmer's Manual							 GETGID(P)

NAME
getgid - get the real group ID
SYNOPSIS
#include <unistd.h> gid_t getgid(void);
DESCRIPTION
The getgid() function shall return the real group ID of the calling process.
RETURN VALUE
The getgid() function shall always be successful and no return value is reserved to indicate an error.
ERRORS
No errors are defined. The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
getegid() , geteuid() , getuid() , setegid() , seteuid() , setgid() , setregid() , setreuid() , setuid() , the Base Definitions volume of IEEE Std 1003.1-2001, <sys/types.h>, <unistd.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol- ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .
IEEE
/The Open Group 2003 GETGID(P)