getgrouplist man page on FreeBSD

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

     getgrouplist — calculate group access list

     Standard C Library (libc, -lc)

     #include <unistd.h>

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

     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.

     The getgrouplist() function returns -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.

     /etc/group	 group membership list

     setgroups(2), initgroups(3)

     The getgrouplist() function first appeared in 4.4BSD.

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

BSD				 June 9, 1993				   BSD

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