setgroups(2) [sunos man page]

getgroups(2)							   System Calls 						      getgroups(2)

NAME

       getgroups, setgroups - get or set supplementary group access list IDs

SYNOPSIS

       #include <unistd.h>

       int getgroups(int gidsetsize, gid_t *grouplist);

       int setgroups(int ngroups, const gid_t *grouplist);

DESCRIPTION

       The getgroups() function gets the current supplemental group access list of the calling process and stores the result in the array of group
       IDs specified by grouplist. This array has gidsetsize entries and must be large enough to contain the entire  list.  This  list	cannot	be
       larger  than NGROUPS_MAX. If gidsetsize equals 0, getgroups() will return the number of groups to which the calling process belongs without
       modifying the array pointed to by grouplist.

       The setgroups() function sets the supplementary group access list of the calling process from the array of group  IDs  specified  by  grou-
       plist. The number of entries is specified by ngroups and can not be greater than NGROUPS_MAX.

RETURN VALUES

       Upon  successful  completion, getgroups() returns the number of supplementary group IDs set for the calling process and setgroups() returns
       0. Otherwise, -1 is returned and errno is set to indicate the error.

ERRORS

       The getgroups() and setgroups() functions will fail if:

       EFAULT	       A referenced part of the array pointed to by grouplist is an illegal address.

       The getgroups() function will fail if:

       EINVAL	       The value of gidsetsize is non-zero and less than the number of supplementary group IDs set for the calling process.

       The setgroups() function will fail if:

       EINVAL	       The value of ngroups is greater than {NGROUPS_MAX}.

       EPERM	       The {PRIV_PROC_SETID} privilege is not asserted in the effective set of the calling process.

USAGE

       Use of the setgroups() function requires the {PRIV_PROC_SETID} privilege.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |getgroups() is Standard.	   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Async-Signal-Safe 	   |
       +-----------------------------+-----------------------------+

SEE ALSO

       groups(1), chown(2), getuid(2), setuid(2), getgrnam(3C), initgroups(3C), attributes(5), privileges(5), standards(5)

SunOS 5.10							    1 Feb 2003							      getgroups(2)

Check Out this Related Man Page

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

NAME

       getgroups, setgroups - get/set list of supplementary group IDs

SYNOPSIS

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

       int getgroups(int size, gid_t list[]);

       #include <grp.h>

       int setgroups(size_t size, const gid_t *list);

DESCRIPTION

       getgroups
	      Up to size supplementary group IDs are returned in list.	It is unspecified whether the effective group ID of the calling process is
	      included in the returned list. (Thus, an application should also call getegid(2) and add or remove the resulting value.)	If size is
	      zero, list is not modified, but the total number of supplementary group IDs for the process is returned.

       setgroups
	      Sets the supplementary group IDs for the process.  Only the super-user may use this function.

RETURN VALUE

       getgroups
	      On success, the number of supplementary group IDs is returned.  On error, -1 is returned, and errno is set appropriately.

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

ERRORS

       EFAULT list has an invalid address.

       EPERM  For setgroups, the user is not the super-user.

       EINVAL For  setgroups,  size  is  greater than NGROUPS (32 for Linux 2.0.32).  For getgroups, size is less than the number of supplementary
	      group IDs, but is not zero.

NOTES

       A process can have up to at least NGROUPS_MAX supplementary group IDs in addition to the effective group ID. The set of supplementary group
       IDs  is	inherited  from the parent process and may be changed using setgroups.	The maximum number of supplementary group IDs can be found
       using sysconf(3):
	   long ngroups_max;
	   ngroups_max = sysconf(_SC_NGROUPS_MAX);
       The maximal return value of getgroups cannot be larger than one more than the value obtained this way.

       The prototype for setgroups is only available if _BSD_SOURCE is defined (either explicitly, or implicitly, by not defining _POSIX_SOURCE or
       compiling with the -ansi flag).

CONFORMING TO

       SVr4,  SVID  (issue  4 only; these calls were not present in SVr3), X/OPEN, 4.3BSD.  The getgroups function is in POSIX.1.  Since setgroups
       requires privilege, it is not covered by POSIX.1.

SEE ALSO

       initgroups(3), getgid(2), setgid(2)

Linux 2.0.32							    1997-12-10							      GETGROUPS(2)

Linux and UNIX Man Pages

setgroups(2) [sunos man page]

Check Out this Related Man Page