Rev 1063 | Details | Compare with Previous | Last modification | View Log | RSS feed
Rev | Author | Line No. | Line |
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2 | pj | 1 | |
1063 | tullio | 2 | /* |
3 | * This program is free software; you can redistribute it and/or modify |
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4 | * it under the terms of the GNU General Public License as published by |
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5 | * the Free Software Foundation; either version 2 of the License, or |
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6 | * (at your option) any later version. |
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7 | * |
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8 | * This program is distributed in the hope that it will be useful, |
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9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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11 | * GNU General Public License for more details. |
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12 | * |
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13 | * You should have received a copy of the GNU General Public License |
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14 | * along with this program; if not, write to the Free Software |
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15 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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16 | * |
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17 | */ |
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18 | |||
2 | pj | 19 | #include <fs/types.h> |
20 | #include <fs/errno.h> |
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21 | #include <fs/task.h> |
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22 | #include <fs/maccess.h> |
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23 | #include <fs/fcntl.h> |
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24 | |||
25 | #include "file.h" |
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26 | #include "inode.h" |
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27 | #include "dentry.h" |
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28 | #include "fileop.h" |
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29 | #include "fsconst.h" |
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30 | #include "fs.h" |
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31 | |||
32 | /* NB: alcune operazioni sui files vanno fatte in mutua esclusione */ |
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33 | |||
34 | /* to FIX: |
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35 | * -- fd == 0,1,2 then we must write on teminal |
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36 | * (must be integrated better) |
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37 | */ |
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38 | #include <ll/i386/cons.h> |
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39 | |||
40 | __ssize_t k_write(int fd, __ptr_t buf, __ssize_t nbytes) |
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41 | { |
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42 | __pid_t pid; |
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43 | __ssize_t sz; |
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44 | |||
45 | call_to_fs(); |
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46 | |||
47 | /* TO FIX! */ |
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48 | if (fd>=0&&fd<=2) { |
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49 | __ssize_t x; |
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50 | char *c; |
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51 | |||
52 | //printk(KERN_INFO "writing on console with fd=%i",fd); |
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53 | |||
54 | /* WARNING buf is a pointer into user-space |
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55 | * we are using it without cast |
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56 | */ |
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57 | |||
58 | /* WARNING cputc is called without mutex |
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59 | * lock |
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60 | */ |
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61 | |||
62 | if (fd==0) return_from_fs(-EBADF); |
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63 | |||
64 | c=(char*)buf; |
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65 | x=nbytes; |
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66 | while (x-->0) cputc(*c++); |
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67 | |||
68 | return_from_fs(nbytes); |
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69 | } |
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70 | |||
71 | /* don't try to use a bad file descriptor */ |
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72 | pid=__get_pid(); |
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73 | if (check_fd(pid,fd)) { |
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74 | printk(KERN_INFO "k_write: using bad file descriptor"); |
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75 | return_from_fs(-EBADF); |
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76 | } |
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77 | |||
78 | /* don't try to write a directory */ |
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79 | if (file_ptr(pid,fd)->f_flag_isdir) return_from_fs(-EBADF); |
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80 | |||
81 | /* don't try to write from not user memory */ |
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82 | if (!__verify_write(buf,nbytes)) return_from_fs(-EVERIFY); |
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83 | |||
84 | /* if in read only mode (errno OK?)*/ |
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85 | if (*fildesfflags_ptr(pid,fd)&O_RDONLY) |
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86 | return_from_fs(-EPERM); |
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87 | |||
88 | /* cancellation point */ |
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89 | //fs_test_cancellation(-EINTR); |
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90 | |||
91 | /* acquire write lock on inode's file */ |
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92 | __rwlock_wrlock(&file_ptr(pid,fd)->f_dentry->d_inode->i_lock); |
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93 | |||
94 | if (*fildesfflags_ptr(pid,fd)&O_APPEND) |
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95 | if (file_ptr(pid,fd)->f_pos!= |
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96 | file_ptr(pid,fd)->f_dentry->d_inode->i_st.st_size) { |
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97 | __off_t off; |
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98 | off=file_ptr(pid,fd)->f_op->lseek(file_ptr(pid,fd),0,SEEK_END); |
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99 | if (off!=file_ptr(pid,fd)->f_dentry->d_inode->i_st.st_size) { |
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100 | sz=-ESPIPE; |
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101 | goto SKIP; |
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102 | } |
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103 | } |
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104 | |||
105 | /* WARNIG buf is a pointer into user-space */ |
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106 | sz=file_ptr(pid,fd)->f_op->write(file_ptr(pid,fd),buf,nbytes); |
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107 | |||
108 | /* release the lock */ |
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109 | SKIP: |
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110 | __rwlock_wrunlock(&file_ptr(pid,fd)->f_dentry->d_inode->i_lock); |
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111 | |||
112 | return_from_fs(sz); |
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113 | } |