BSD 4_2 release

[unix-history] / usr / src / lib / libc / gen / initgroups.c

/*      initgroups.c    4.4     83/06/17        */

/*
* initgroups
*/
#include <stdio.h>
#include <sys/param.h>
#include <grp.h>

struct group *getgrent();

initgroups(uname, agroup)
       char *uname;
       int agroup;
{
       int groups[NGROUPS], ngroups = 0;
       register struct group *grp;
       register int i;

       if (agroup >= 0)
               groups[ngroups++] = agroup;
       setgrent();
       while (grp = getgrent()) {
               if (grp->gr_gid == agroup)
                       continue;
               for (i = 0; grp->gr_mem[i]; i++)
                       if (!strcmp(grp->gr_mem[i], uname)) {
                               if (ngroups == NGROUPS) {
fprintf(stderr, "initgroups: %s is in too many groups\n", uname);
                                       goto toomany;
                               }
                               groups[ngroups++] = grp->gr_gid;
                       }
       }
toomany:
       endgrent();
       if (setgroups(ngroups, groups) < 0) {
               perror("setgroups");
               return (1);
       }
       return (0);
}