getgid - Man Page

get the real group ID


This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.


#include <unistd.h>

gid_t getgid(void);


The getgid() function shall return the real group ID of the calling process. The getgid() function shall not modify errno.

Return Value

The getgid() function shall always be successful and no return value is reserved to indicate an error.


No errors are defined.

The following sections are informative.



Application Usage



In a conforming environment, getgid() will always succeed. It is possible for implementations to provide an extension where a process in a non-conforming environment will not be associated with a user or group ID. It is recommended that such implementations return (gid_t)-1 and set errno to indicate such an environment; doing so does not violate this standard, since such an environment is already an extension.

Future Directions


See Also

getegid(), geteuid(), getuid(), setegid(), seteuid(), setgid(), setregid(), setreuid(), setuid()

The Base Definitions volume of POSIX.1-2017, <sys_types.h>, <unistd.h>

Referenced By

getegid(3p), geteuid(3p), getuid(3p), id(1p), setegid(3p), seteuid(3p), setgid(3p), setregid(3p), setreuid(3p), setuid(3p), unistd.h(0p).

2017 IEEE/The Open Group POSIX Programmer's Manual