1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Change File Modes |
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5 | * @ingroup libcsupport |
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6 | */ |
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7 | |
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8 | /* |
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9 | * COPYRIGHT (c) 1989-2011. |
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10 | * On-Line Applications Research Corporation (OAR). |
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11 | * |
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12 | * The license and distribution terms for this file may be |
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13 | * found in the file LICENSE in this distribution or at |
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14 | * http://www.rtems.org/license/LICENSE. |
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15 | */ |
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16 | |
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17 | #if HAVE_CONFIG_H |
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18 | #include "config.h" |
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19 | #endif |
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20 | |
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21 | #include <sys/stat.h> |
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22 | #include <string.h> |
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23 | |
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24 | #include <rtems/libio_.h> |
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25 | |
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26 | int rtems_filesystem_chmod( |
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27 | const rtems_filesystem_location_info_t *loc, |
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28 | mode_t mode |
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29 | ) |
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30 | { |
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31 | const rtems_filesystem_mount_table_entry_t *mt_entry = loc->mt_entry; |
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32 | int rv; |
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33 | |
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34 | if ( mt_entry->writeable || rtems_filesystem_location_is_null( loc ) ) { |
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35 | struct stat st; |
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36 | |
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37 | memset( &st, 0, sizeof(st) ); |
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38 | |
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39 | rv = (*loc->handlers->fstat_h)( loc, &st ); |
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40 | if ( rv == 0 ) { |
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41 | uid_t uid = geteuid(); |
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42 | |
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43 | if ( uid == 0 || st.st_uid == uid ) { |
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44 | mode_t mask = S_IRWXU | S_IRWXG | S_IRWXO | S_ISUID | S_ISGID | S_ISVTX; |
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45 | |
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46 | mode = (st.st_mode & ~mask) | (mode & mask); |
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47 | |
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48 | rv = (*mt_entry->ops->fchmod_h)( loc, mode ); |
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49 | } else { |
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50 | errno = EPERM; |
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51 | rv = -1; |
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52 | } |
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53 | } |
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54 | } else { |
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55 | errno = EROFS; |
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56 | rv = -1; |
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57 | } |
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58 | |
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59 | return rv; |
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60 | } |
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61 | |
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62 | /** |
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63 | * POSIX 1003.1b 5.6.4 - Change File Modes |
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64 | */ |
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65 | int fchmod( int fd, mode_t mode ) |
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66 | { |
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67 | int rv; |
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68 | rtems_libio_t *iop; |
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69 | |
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70 | rtems_libio_check_fd( fd ); |
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71 | iop = rtems_libio_iop( fd ); |
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72 | rtems_libio_check_is_open(iop); |
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73 | |
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74 | rtems_filesystem_instance_lock( &iop->pathinfo ); |
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75 | |
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76 | rv = rtems_filesystem_chmod( &iop->pathinfo, mode ); |
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77 | |
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78 | rtems_filesystem_instance_unlock( &iop->pathinfo ); |
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79 | |
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80 | return rv; |
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81 | } |
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