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Annotation of 43BSDReno/lib/libc/gen/initgroups.c, revision 1.1

1.1     ! root        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: (1) source distributions retain this entire copyright
        !             7:  * notice and comment, and (2) distributions including binaries display
        !             8:  * the following acknowledgement:  ``This product includes software
        !             9:  * developed by the University of California, Berkeley and its contributors''
        !            10:  * in the documentation or other materials provided with the distribution
        !            11:  * and in all advertising materials mentioning features or use of this
        !            12:  * software. Neither the name of the University nor the names of its
        !            13:  * contributors may be used to endorse or promote products derived
        !            14:  * from this software without specific prior written permission.
        !            15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            18:  */
        !            19: 
        !            20: #if defined(LIBC_SCCS) && !defined(lint)
        !            21: static char sccsid[] = "@(#)initgroups.c       5.6 (Berkeley) 6/1/90";
        !            22: #endif /* LIBC_SCCS and not lint */
        !            23: 
        !            24: /*
        !            25:  * initgroups
        !            26:  */
        !            27: #include <stdio.h>
        !            28: #include <sys/param.h>
        !            29: #include <grp.h>
        !            30: 
        !            31: struct group *getgrent();
        !            32: 
        !            33: initgroups(uname, agroup)
        !            34:        char *uname;
        !            35:        int agroup;
        !            36: {
        !            37:        int groups[NGROUPS], ngroups = 0;
        !            38:        register struct group *grp;
        !            39:        register int i;
        !            40: 
        !            41:        /*
        !            42:         * If installing primary group, duplicate it;
        !            43:         * the first element of groups is the effective gid
        !            44:         * and will be overwritten when a setgid file is executed.
        !            45:         */
        !            46:        if (agroup >= 0) {
        !            47:                groups[ngroups++] = agroup;
        !            48:                groups[ngroups++] = agroup;
        !            49:        }
        !            50:        setgrent();
        !            51:        while (grp = getgrent()) {
        !            52:                if (grp->gr_gid == agroup)
        !            53:                        continue;
        !            54:                for (i = 0; grp->gr_mem[i]; i++)
        !            55:                        if (!strcmp(grp->gr_mem[i], uname)) {
        !            56:                                if (ngroups == NGROUPS) {
        !            57: fprintf(stderr, "initgroups: %s is in too many groups\n", uname);
        !            58:                                        goto toomany;
        !            59:                                }
        !            60:                                groups[ngroups++] = grp->gr_gid;
        !            61:                        }
        !            62:        }
        !            63: toomany:
        !            64:        endgrent();
        !            65:        if (setgroups(ngroups, groups) < 0) {
        !            66:                perror("setgroups");
        !            67:                return (-1);
        !            68:        }
        !            69:        return (0);
        !            70: }

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