1 | /* |
---|
2 | * write() - POSIX 1003.1b 6.4.2 - Write to a File |
---|
3 | * |
---|
4 | * COPYRIGHT (c) 1989-1998. |
---|
5 | * On-Line Applications Research Corporation (OAR). |
---|
6 | * Copyright assigned to U.S. Government, 1994. |
---|
7 | * |
---|
8 | * The license and distribution terms for this file may be |
---|
9 | * found in the file LICENSE in this distribution or at |
---|
10 | * http://www.OARcorp.com/rtems/license.html. |
---|
11 | * |
---|
12 | * $Id$ |
---|
13 | */ |
---|
14 | |
---|
15 | #include "libio_.h" |
---|
16 | |
---|
17 | |
---|
18 | /* |
---|
19 | * write |
---|
20 | * |
---|
21 | * This routine writes count bytes from from buffer pointed to by buffer |
---|
22 | * to the file associated with the open file descriptor, fildes. |
---|
23 | */ |
---|
24 | |
---|
25 | ssize_t write( |
---|
26 | int fd, |
---|
27 | const void *buffer, |
---|
28 | size_t count |
---|
29 | ) |
---|
30 | { |
---|
31 | rtems_status_code rc; |
---|
32 | rtems_libio_t *iop; |
---|
33 | |
---|
34 | rtems_libio_check_fd( fd ); |
---|
35 | iop = rtems_libio_iop( fd ); |
---|
36 | rtems_libio_check_is_open(iop); |
---|
37 | rtems_libio_check_buffer( buffer ); |
---|
38 | rtems_libio_check_count( count ); |
---|
39 | rtems_libio_check_permissions( iop, LIBIO_FLAGS_WRITE ); |
---|
40 | |
---|
41 | /* |
---|
42 | * If this file descriptor is mapped to an external set of handlers, |
---|
43 | * then pass the request on to them. |
---|
44 | */ |
---|
45 | |
---|
46 | if ( iop->flags & LIBIO_FLAGS_HANDLER_MASK ) { |
---|
47 | rtems_libio_write_t fp; |
---|
48 | |
---|
49 | fp = rtems_libio_handlers[ |
---|
50 | (iop->flags >> LIBIO_FLAGS_HANDLER_SHIFT) - 1].write; |
---|
51 | if ( fp == NULL ) |
---|
52 | set_errno_and_return_minus_one( EBADF ); |
---|
53 | |
---|
54 | return (*fp)( fd, buffer, count ); |
---|
55 | } |
---|
56 | |
---|
57 | /* |
---|
58 | * Now process the write() request. |
---|
59 | */ |
---|
60 | |
---|
61 | if ( !iop->handlers->write ) |
---|
62 | set_errno_and_return_minus_one( ENOTSUP ); |
---|
63 | |
---|
64 | rc = (*iop->handlers->write)( iop, buffer, count ); |
---|
65 | |
---|
66 | if ( rc > 0 ) |
---|
67 | iop->offset += rc; |
---|
68 | |
---|
69 | return rc; |
---|
70 | } |
---|
71 | |
---|
72 | /* |
---|
73 | * _write_r |
---|
74 | * |
---|
75 | * This is the Newlib dependent reentrant version of write(). |
---|
76 | */ |
---|
77 | |
---|
78 | #if defined(RTEMS_NEWLIB) |
---|
79 | |
---|
80 | #include <reent.h> |
---|
81 | |
---|
82 | long _write_r( |
---|
83 | struct _reent *ptr, |
---|
84 | int fd, |
---|
85 | const void *buf, |
---|
86 | size_t nbytes |
---|
87 | ) |
---|
88 | { |
---|
89 | return write( fd, buf, nbytes ); |
---|
90 | } |
---|
91 | #endif |
---|