initgroups(3) [netbsd man page]

INITGROUPS(3)						   BSD Library Functions Manual 					     INITGROUPS(3)

NAME

     initgroups -- initialize supplementary group IDs

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <unistd.h>

     int
     initgroups(const char *name, gid_t basegid);

DESCRIPTION

     The initgroups() function uses the getgrouplist(3) function to calculate the supplementary group IDs for the user specified in name.  This
     group list is then set up for the current process using setgroups(2).  The basegid is automatically included in the group list.  Typically
     this value is given as the group number from the password file.

     If the groups database lists more than NGROUPS groups for name (including one for basegid), the later groups are ignored.

RETURN VALUES

     The initgroups() function returns -1 if it was not invoked by the super-user.

SEE ALSO

     setgroups(2), getgrouplist(3)

HISTORY

     The initgroups() function appeared in 4.2BSD.

BUGS

     The getgrouplist() function called by initgroups() uses the routines based on getgrent(3).  If the invoking program uses any of these rou-
     tines, the group structure will be overwritten in the call to initgroups().

BSD
								  August 10, 2002							       BSD

GETGROUPLIST(3) 					   BSD Library Functions Manual 					   GETGROUPLIST(3)

NAME

     getgrouplist -- calculate group access list

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <unistd.h>

     int
     getgrouplist(const char *name, gid_t basegid, gid_t *groups, int *ngroups);

DESCRIPTION

     The getgrouplist() function reads through the group file and calculates the group access list for the user specified in name.  The basegid is
     automatically included in the groups list.  Typically this value is given as the group number from the password file.

     The resulting group list is returned in the array pointed to by groups.  The caller specifies the size of the groups array in the integer
     pointed to by ngroups; the actual number of groups found is returned in ngroups.

RETURN VALUES

     The getgrouplist() function returns 0 on success and -1 if the size of the group list is too small to hold all the user's groups.	Here, the
     group array will be filled with as many groups as will fit.

FILES

     /etc/group  group membership list

SEE ALSO

     setgroups(2), initgroups(3)

HISTORY

     The getgrouplist() function first appeared in 4.4BSD.

BSD
								 October 26, 2014							       BSD