Rev 2 | Rev 684 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 2 | pj | 1 | |
| 2 | #include <fs/types.h> |
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| 3 | #include <fs/errno.h> |
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| 4 | #include <fs/task.h> |
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| 5 | #include <fs/maccess.h> |
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| 6 | #include <fs/fcntl.h> |
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| 7 | |||
| 8 | #include "file.h" |
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| 9 | #include "inode.h" |
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| 10 | #include "dentry.h" |
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| 11 | #include "fileop.h" |
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| 12 | #include "rwlock.h" |
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| 13 | #include "fs.h" |
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| 14 | |||
| 15 | #define EBOH EIO |
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| 16 | |||
| 17 | /* temporary: for console i/o */ |
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| 18 | #include <ll/i386/cons.h> |
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| 19 | #include <drivers/keyb.h> |
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| 20 | static int __getch(int flag) |
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| 21 | { |
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| 22 | KEY_EVT key; |
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| 23 | for (;;) { |
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| 24 | if (!keyb_getcode(&key,flag)) return -1; |
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| 25 | if (isScanCode(key)) continue; |
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| 26 | if (isLeftCtrl(key)||isRightCtrl(key)) { |
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| 27 | if (key.ascii>='a'&&key.ascii<='z') return key.ascii-'a'+1; |
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| 28 | if (key.ascii>='A'&&key.ascii<='Z') return key.ascii-'A'+1; |
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| 29 | } |
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| 30 | if (key.ascii==0x0d) return 0x0a; // 'Enter' is '\n' |
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| 31 | return key.ascii; |
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| 32 | } |
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| 33 | } |
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| 34 | |||
| 35 | __ssize_t k_read(int fd, __ptr_t buf, __ssize_t nbytes) |
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| 36 | { |
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| 37 | __pid_t pid; |
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| 38 | __ssize_t sz; |
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| 39 | |||
| 40 | call_to_fs(); |
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| 41 | |||
| 42 | /* TO FIX! */ |
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| 43 | if (fd>=0&&fd<=2) { |
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| 44 | __ssize_t x; |
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| 45 | int ret,ch; |
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| 46 | char *c; |
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| 47 | |||
| 48 | //printk(KERN_INFO "reading from console"); |
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| 49 | |||
| 50 | /* WARNIG buf is a pointer into user-space |
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| 51 | * we are using it without cast |
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| 52 | */ |
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| 53 | |||
| 54 | /* WARNIG there is a blocking call... |
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| 55 | * the system can go down if it is blocked! |
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| 56 | */ |
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| 57 | |||
| 58 | if (fd!=0) return_from_fs(-EBADF); |
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| 59 | |||
| 60 | c=(char*)buf; |
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| 61 | x=0; |
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| 62 | while (x<nbytes) { |
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| 63 | ch=__getch(NON_BLOCK); |
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| 64 | if (ch!=-1) *c++=ch; |
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| 65 | else { |
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| 66 | if (x>0) break; |
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| 67 | release_sys_call(); |
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| 68 | ch=__getch(BLOCK); |
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| 69 | ret=reacquire_sys_call(); |
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| 70 | if (ret) return -ENOSYS; |
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| 71 | *c++=ch; |
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| 72 | } |
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| 73 | x++; |
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| 74 | cputc(ch); |
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| 75 | } |
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| 76 | |||
| 77 | return_from_fs(x); |
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| 78 | } |
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| 79 | |||
| 80 | /* don't try to use bad file descriptor */ |
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| 81 | pid=__get_pid(); |
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| 82 | if (check_fd(pid,fd)) { |
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| 83 | printk(KERN_INFO "k_read: using bad file descriptor"); |
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| 84 | return_from_fs(-EBADF); |
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| 85 | } |
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| 86 | |||
| 87 | /* don't try to read a directory */ |
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| 88 | if (file_ptr(pid,fd)->f_flag_isdir) return_from_fs(-EBADF); |
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| 89 | |||
| 90 | /* don't try to read into not user memory */ |
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| 91 | if (!__verify_write(buf,nbytes)) return_from_fs(-EVERIFY); |
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| 92 | |||
| 93 | /* if in write only mode */ |
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| 94 | if (*fildesfflags_ptr(pid,fd)&O_WRONLY) |
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| 95 | return_from_fs(-EBOH); |
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| 96 | |||
| 97 | /* cancellation point */ |
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| 98 | //fs_test_cancellation(-EINTR); |
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| 99 | |||
| 100 | /* acquire read lock on inode's file */ |
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| 101 | __rwlock_rdlock(&file_ptr(pid,fd)->f_dentry->d_inode->i_lock); |
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| 102 | |||
| 103 | /* O_APPEND flags */ |
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| 104 | if (*fildesfflags_ptr(pid,fd)&O_APPEND) { |
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| 105 | sz=0; |
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| 106 | goto SKIP; |
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| 107 | } |
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| 108 | |||
| 109 | /* WARNING buf is a pointer into user-space! */ |
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| 110 | sz=file_ptr(pid,fd)->f_op->read(file_ptr(pid,fd),buf,nbytes); |
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| 111 | |||
| 112 | /* release the lock */ |
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| 113 | SKIP: |
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| 114 | __rwlock_rdunlock(&file_ptr(pid,fd)->f_dentry->d_inode->i_lock); |
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| 115 | |||
| 116 | return_from_fs(sz); |
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| 117 | } |