1 /* 2 * Copyright (c) 1983 Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms are permitted 6 * provided that the above copyright notice and this paragraph are 7 * duplicated in all such forms and that any documentation, 8 * advertising materials, and other materials related to such 9 * distribution and use acknowledge that the software was developed 10 * by the University of California, Berkeley. The name of the 11 * University may not be used to endorse or promote products derived 12 * from this software without specific prior written permission. 13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 15 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16 */ 17 18 #if defined(LIBC_SCCS) && !defined(lint) 19 static char sccsid[] = "@(#)initgroups.c 5.4 (Berkeley) 07/18/88"; 20 #endif /* LIBC_SCCS and not lint */ 21 22 /* 23 * initgroups 24 */ 25 #include <stdio.h> 26 #include <sys/param.h> 27 #include <grp.h> 28 29 struct group *getgrent(); 30 31 initgroups(uname, agroup) 32 char *uname; 33 int agroup; 34 { 35 int groups[NGROUPS], ngroups = 0; 36 register struct group *grp; 37 register int i; 38 39 if (agroup >= 0) 40 groups[ngroups++] = agroup; 41 setgrent(); 42 while (grp = getgrent()) { 43 if (grp->gr_gid == agroup) 44 continue; 45 for (i = 0; grp->gr_mem[i]; i++) 46 if (!strcmp(grp->gr_mem[i], uname)) { 47 if (ngroups == NGROUPS) { 48 fprintf(stderr, "initgroups: %s is in too many groups\n", uname); 49 goto toomany; 50 } 51 groups[ngroups++] = grp->gr_gid; 52 } 53 } 54 toomany: 55 endgrent(); 56 if (setgroups(ngroups, groups) < 0) { 57 perror("setgroups"); 58 return (-1); 59 } 60 return (0); 61 } 62