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