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| 30 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
30 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| 31 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE |
31 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE |
| 32 | * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, |
32 | * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, |
| 33 | * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
33 | * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 34 | */ |
34 | */ |
| 35 | 35 | ||
| - | 36 | /** @addtogroup FileSystemImpl |
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| - | 37 | * @{ |
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| 36 | 38 | */ |
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| 37 | /* This file contains the procedures that manipulate file descriptors. */ |
- | |
| 38 | 39 | ||
| 39 | /* |
40 | /** |
| 40 | * Methods: |
41 | * @file filedesc.c |
| 41 | * get_fd: look for free file descriptor and free filp slots |
- | |
| 42 | * get_filp: look up the filp entry for a given file descriptor |
42 | * @brief This file contains the procedures that manipulate file descriptors. |
| 43 | * find_filp: find a filp slot that points to a given inode |
- | |
| 44 | */ |
43 | */ |
| 45 | 44 | ||
| 46 | - | ||
| 47 | #include "fs.h" |
45 | #include "fs.h" |
| 48 | #include "file.h" |
46 | #include "file.h" |
| 49 | #include "fproc.h" |
47 | #include "fproc.h" |
| 50 | #include "inode.h" |
48 | #include "inode.h" |
| 51 | 49 | ||
| 52 | 50 | /** |
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| - | 51 | * Look for free file descriptor and free filp slots |
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| - | 52 | */ |
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| 53 | int get_fd(int start, int *k, filp_t **fpt) |
53 | int get_fd(int start, int *k, filp_t **fpt) |
| 54 | { |
54 | { |
| 55 | /* Look for a free file descriptor and a free filp slot. */ |
55 | /* Look for a free file descriptor and a free filp slot. */ |
| 56 | 56 | ||
| 57 | register filp_t *f; |
57 | register filp_t *f; |
| Line 85... | Line 85... | ||
| 85 | 85 | ||
| 86 | /* If control passes here, the filp table must be full. Report that back. */ |
86 | /* If control passes here, the filp table must be full. Report that back. */ |
| 87 | return FS_ENFILE; |
87 | return FS_ENFILE; |
| 88 | } |
88 | } |
| 89 | 89 | ||
| - | 90 | /** |
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| - | 91 | * Look up the filp entry for a given file descriptor |
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| 90 | 92 | */ |
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| 91 | filp_t *get_filp(int fild) |
93 | filp_t *get_filp(int fild) |
| 92 | { |
94 | { |
| 93 | 95 | ||
| 94 | /* See if 'fild' refers to a valid file descr. If so, return its filp ptr. */ |
96 | /* See if 'fild' refers to a valid file descr. If so, return its filp ptr. */ |
| 95 | 97 | ||
| Line 99... | Line 101... | ||
| 99 | 101 | ||
| 100 | return(fp->fp_filp[fild]); /* may also be NIL_FILP */ |
102 | return(fp->fp_filp[fild]); /* may also be NIL_FILP */ |
| 101 | } |
103 | } |
| 102 | 104 | ||
| 103 | 105 | ||
| - | 106 | /** |
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| - | 107 | * Find a filp slot that points to a given inode |
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| - | 108 | */ |
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| 104 | filp_t *find_filp(register inode_t *rip) |
109 | filp_t *find_filp(register inode_t *rip) |
| 105 | { |
110 | { |
| 106 | 111 | ||
| 107 | /* Find a filp slot that refers to the inode 'rip' in a way as described. |
112 | /* Find a filp slot that refers to the inode 'rip' in a way as described. |
| 108 | * Used for determining whether somebody is still interested in. |
113 | * Used for determining whether somebody is still interested in. |
| Line 119... | Line 124... | ||
| 119 | 124 | ||
| 120 | /* If control passes here, the filp wasn't there. Report that back. */ |
125 | /* If control passes here, the filp wasn't there. Report that back. */ |
| 121 | return NIL_FILP; |
126 | return NIL_FILP; |
| 122 | } |
127 | } |
| 123 | 128 | ||
| - | 129 | ||
| - | 130 | /** |
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| - | 131 | * } |
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| - | 132 | */ |
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| - | 133 | ||