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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 2380 | konopa | 1 | /* This file contains the code for performing four system calls relating to |
| 2 | * status and directories. |
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| 3 | */ |
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| 4 | |||
| 5 | /* Methods: |
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| 6 | * do_chdir: perform the CHDIR system call |
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| 7 | * do_stat: perform the STAT system call |
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| 8 | * do_fstat: perform the FSTAT system call |
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| 9 | */ |
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| 10 | |||
| 11 | |||
| 12 | #include "fs.h" |
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| 13 | #include "stat.h" |
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| 14 | #include "file.h" |
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| 15 | #include "fproc.h" |
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| 16 | #include "inode.h" |
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| 17 | #include "param.h" |
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| 18 | |||
| 19 | |||
| 20 | static int change(inode_t **iip, char *name_ptr, int len); |
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| 21 | static int stat_inode(inode_t *rip, filp_t *fil_ptr, char *user_addr); |
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| 22 | |||
| 23 | int do_chdir() |
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| 24 | { |
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| 25 | |||
| 26 | /* Perform the chdir(file_name) system call */ |
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| 27 | int r; |
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| 28 | |||
| 29 | r = change(&fp->fp_workdir, file_name, strlen(file_name)+1); |
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| 30 | |||
| 31 | return r; |
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| 32 | } |
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| 33 | |||
| 34 | int change(inode_t **iip, char *name_ptr, int len) |
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| 35 | { |
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| 36 | |||
| 37 | /* |
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| 38 | * iip: pointer to the inode pointer for the dir |
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| 39 | * name_ptr: pointer to the directory name to change to |
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| 40 | * len: length of the directory name string |
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| 41 | */ |
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| 42 | |||
| 43 | /* Do the actual work for chdir() and chroot(). */ |
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| 44 | |||
| 45 | inode_t *rip; |
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| 46 | register int r; |
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| 47 | |||
| 48 | r = OK; |
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| 49 | |||
| 50 | /* Try to open the new directory. */ |
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| 51 | if (fetch_name(name_ptr, len) != OK) |
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| 52 | return err_code; |
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| 53 | |||
| 54 | if ((rip = eat_path(user_path)) == NIL_INODE) |
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| 55 | return err_code; |
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| 56 | |||
| 57 | /* It must be a directory and also be searchable. */ |
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| 58 | if ((rip->i_mode & I_TYPE) != I_DIRECTORY) |
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| 59 | r = FS_ENOTDIR; |
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| 60 | |||
| 61 | /* If error, return inode. */ |
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| 62 | if (r != OK) { |
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| 63 | put_inode(rip); |
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| 64 | return r; |
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| 65 | } |
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| 66 | |||
| 67 | /* Everything is OK. Make the change. */ |
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| 68 | put_inode(*iip); /* release the old directory */ |
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| 69 | *iip = rip; /* acquire the new one */ |
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| 70 | |||
| 71 | return OK; |
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| 72 | } |
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| 73 | |||
| 74 | int do_stat() |
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| 75 | { |
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| 76 | |||
| 77 | /* Perform the stat(name, buf) system call. */ |
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| 78 | |||
| 79 | register inode_t *rip; |
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| 80 | register int r; |
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| 81 | |||
| 82 | /* Both stat() and fstat() use the same routine to do the real work. That |
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| 83 | * routine expects an inode, so acquire it temporarily. |
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| 84 | */ |
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| 85 | |||
| 86 | if (fetch_name(file_name, strlen(file_name)+1) != OK) |
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| 87 | return err_code; |
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| 88 | |||
| 89 | if ((rip = eat_path(user_path)) == NIL_INODE) |
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| 90 | return err_code; |
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| 91 | |||
| 92 | r = stat_inode(rip, NIL_FILP, fp->buffer); /* actually do the work.*/ |
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| 93 | put_inode(rip); /* release the inode */ |
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| 94 | |||
| 95 | return r; |
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| 96 | } |
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| 97 | |||
| 98 | int do_fstat() |
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| 99 | { |
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| 100 | |||
| 101 | /* Perform the fstat(fd, buf) system call. */ |
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| 102 | |||
| 103 | register filp_t *rfilp; |
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| 104 | |||
| 105 | |||
| 106 | /* Is the file descriptor valid? */ |
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| 107 | if ((rfilp = get_filp(fd)) == NIL_FILP) |
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| 108 | return err_code; |
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| 109 | |||
| 110 | if (rfilp->filp_ino == NIL_INODE) |
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| 111 | return FS_ENOENT; |
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| 112 | |||
| 113 | return(stat_inode(rfilp->filp_ino, NIL_FILP, fp->buffer)); |
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| 114 | } |
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| 115 | |||
| 116 | int stat_inode(register inode_t *rip, filp_t *fil_ptr, char *user_addr) |
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| 117 | { |
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| 118 | |||
| 119 | /* |
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| 120 | * rip: pointer to inode to stat |
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| 121 | * fil_ptr: filp pointer, supplied by 'fstat' |
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| 122 | * user_addr: user space address where stat buf goes |
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| 123 | */ |
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| 124 | |||
| 125 | /* Common code for stat and fstat system calls. */ |
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| 126 | |||
| 127 | stat_t statbuf; |
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| 128 | |||
| 129 | /* Fill in the statbuf struct. */ |
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| 130 | statbuf.st_ino = rip->i_num; |
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| 131 | statbuf.st_mode = rip->i_mode; |
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| 132 | statbuf.st_nlink = rip->i_nlinks & BYTE; |
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| 133 | statbuf.st_size = rip->i_size; |
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| 134 | |||
| 135 | /* Copy infomations to userspace. */ |
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| 136 | memcpy(user_addr, &statbuf, sizeof(statbuf)); |
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| 137 | |||
| 138 | return OK; |
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| 139 | } |
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| 140 |