checkgid(8) [linux man page]

CHECKGID(8)						      System Manager's Manual						       CHECKGID(8)

NAME

       checkgid - checks the gid

SYNOPSIS

       checkgid group

DESCRIPTION

       This manual page documents briefly the checkgid command.

       checkgid is a program that checks whether it can setgid to the group specified. This is to see if it is a valid group for apache2 to use at
       runtime.  If the user (should be run as superuser) is in that group, or can setgid to it, it will return 0.

AUTHOR

       This manual page was written by Daniel Stone <daniel@sfarc.net> for the Debian GNU/Linux distribution, as the original did not have a  man-
       page.

								November 3rd, 2001						       CHECKGID(8)

SETGID(2)						     Linux Programmer's Manual							 SETGID(2)

NAME

       setgid - set group identity

SYNOPSIS

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

       int setgid(gid_t gid);

DESCRIPTION

       setgid()  sets the effective group ID of the calling process.  If the caller is the superuser, the real GID and saved set-group-ID are also
       set.

       Under Linux, setgid() is implemented like the POSIX version with the _POSIX_SAVED_IDS feature.  This allows a set-group-ID program that	is
       not  set-user-ID-root to drop all of its group privileges, do some un-privileged work, and then reengage the original effective group ID in
       a secure manner.

RETURN VALUE

       On success, zero is returned.  On error, -1 is returned, and errno is set appropriately.

ERRORS

       EPERM  The calling process is not privileged (does not have the CAP_SETGID capability), and gid does not match the real group ID  or  saved
	      set-group-ID of the calling process.

CONFORMING TO

       SVr4, POSIX.1-2001.

SEE ALSO

       getgid(2), setegid(2), setregid(2), capabilities(7), credentials(7)

COLOPHON

       This  page is part of release 3.25 of the Linux man-pages project.  A description of the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

Linux								    2009-10-17								 SETGID(2)