5
Last change
on this file since 1c6926c1 was
ffa71f1,
checked in by Sebastian Huber <sebastian.huber@…>, on 11/17/14 at 06:53:01
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libcsupport: Implement getgroups()
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-
Property mode set to
100644
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File size:
1.1 KB
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Line | |
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1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Get Supplementary IDs |
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5 | * @ingroup libcsupport |
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6 | */ |
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7 | |
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8 | #if HAVE_CONFIG_H |
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9 | #include "config.h" |
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10 | #endif |
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11 | |
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12 | #include <sys/types.h> |
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13 | #include <grp.h> |
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14 | #include <pwd.h> |
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15 | #include <string.h> |
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16 | #include <unistd.h> |
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17 | |
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18 | #include <rtems/seterr.h> |
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19 | |
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20 | /** |
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21 | * 4.2.3 Get Supplementary IDs, P1003.1b-1993, p. 86 |
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22 | */ |
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23 | int getgroups( |
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24 | int gidsetsize, |
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25 | gid_t grouplist[] |
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26 | ) |
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27 | { |
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28 | int rv; |
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29 | struct passwd pwd; |
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30 | struct passwd *pwd_res; |
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31 | char buf[256]; |
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32 | gid_t gid; |
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33 | const char *user; |
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34 | struct group *grp; |
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35 | |
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36 | rv = getpwuid_r(getuid(), &pwd, &buf[0], sizeof(buf), &pwd_res); |
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37 | if (rv != 0) { |
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38 | return rv; |
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39 | } |
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40 | |
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41 | gid = pwd.pw_gid; |
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42 | user = pwd.pw_name; |
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43 | |
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44 | setgrent(); |
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45 | |
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46 | while ((grp = getgrent()) != NULL) { |
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47 | char **mem = &grp->gr_mem[0]; |
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48 | |
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49 | if (grp->gr_gid == gid) { |
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50 | continue; |
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51 | } |
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52 | |
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53 | while (*mem != NULL) { |
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54 | if (strcmp(*mem, user) == 0) { |
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55 | if (rv < gidsetsize) { |
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56 | grouplist[rv] = grp->gr_gid; |
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57 | } |
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58 | |
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59 | ++rv; |
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60 | |
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61 | break; |
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62 | } |
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63 | |
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64 | ++mem; |
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65 | } |
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66 | } |
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67 | |
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68 | endgrent(); |
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69 | |
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70 | if (gidsetsize == 0 || rv <= gidsetsize) { |
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71 | return rv; |
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72 | } else { |
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73 | rtems_set_errno_and_return_minus_one(EINVAL); |
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74 | } |
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75 | } |
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