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1
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#define __EXTENSIONS__
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2
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#include <stdio.h>
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3
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#include <stdlib.h>
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4
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#include <pwd.h>
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5
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#include <grp.h>
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6
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#include <err.h>
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7
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#include <unistd.h>
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8
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9
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extern const char *__progname;
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10
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11
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static int
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12
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doit(const char *user, gid_t agroup, int *ngids)
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13
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{
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14
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gid_t *gids;
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15
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int i, ret;
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16
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17
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if ((gids = calloc(*ngids, sizeof (gid_t))) == NULL)
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18
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err(EXIT_FAILURE, "calloc");
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19
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20
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if ((ret = getgrouplist(user, agroup, gids, ngids)) < 0) {
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21
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free(gids);
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22
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return (ret);
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23
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}
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24
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25
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printf("getgrouplist returned %d\n", ret);
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26
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printf("%s:", user);
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27
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for (i = 0; i < ret; i++) {
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28
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struct group *gr = getgrgid(gids[i]);
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29
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30
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if (gr == NULL)
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err(EXIT_FAILURE, "failed to lookup gid %d\n", gids[i]);
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32
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33
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printf("%s%s(%d)", (i > 0) ? ", " : " ", gr->gr_name, gids[i]);
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34
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}
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35
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fputc('\n', stdout);
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36
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37
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free(gids);
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38
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return (ret);
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39
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}
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40
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41
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int
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42
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main(int argc, char **argv)
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43
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{
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44
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struct passwd *pw;
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45
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long ngroups_max;
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46
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int ngids = -1;
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47
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int ret;
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48
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49
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if (argc < 3) {
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50
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fprintf(stderr, "Usage: %s user size\n", __progname);
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51
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return (1);
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52
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}
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53
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54
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ngroups_max = sysconf(_SC_NGROUPS_MAX);
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55
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printf("ngroups_max = %ld\n", ngroups_max);
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56
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57
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pw = getpwnam(argv[1]);
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58
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if (pw == NULL)
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59
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err(EXIT_FAILURE, "error looking up %s", argv[1]);
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60
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61
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ngids = atoi(argv[2]);
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62
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if (ngids < 1)
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63
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err(EXIT_FAILURE, "invalid size: %s\n", argv[2]);
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64
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65
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ret = doit(argv[1], pw->pw_gid, &ngids);
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66
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printf("getgrouplist returned %d (ngids = %d)\n", ret, ngids);
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67
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if (ret > 0)
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68
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return (0);
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69
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70
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71
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ret = doit(argv[1], pw->pw_gid, &ngids);
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72
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printf("getgrouplist returned %d (ngids = %d)\n", ret, ngids);
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73
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return (0);
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74
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}
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