Annotation of prex/usr/lib/posix/file/ioctl.c, Revision 1.1.1.1
1.1 nbrk 1: /*
2: * Copyright (c) 2007, Kohsuke Ohtani
3: * All rights reserved.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: * 3. Neither the name of the author nor the names of any co-contributors
14: * may be used to endorse or promote products derived from this software
15: * without specific prior written permission.
16: *
17: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27: * SUCH DAMAGE.
28: */
29:
30: #include <prex/prex.h>
31: #include <prex/posix.h>
32: #include <server/fs.h>
33: #include <sys/ioctl.h>
34:
35: #include <errno.h>
36: #include <stdarg.h>
37: #include <string.h>
38:
39: int
40: ioctl(int fd, unsigned long request, ...)
41: {
42: struct ioctl_msg m;
43: char *argp;
44: va_list args;
45: size_t size;
46: struct stat st;
47: int err;
48:
49: va_start(args, request);
50: argp = va_arg(args, char *);
51: va_end(args);
52:
53: size = IOCPARM_LEN(request);
54: if (size > IOCPARM_MAX) {
55: errno = ENOTTY;
56: return -1;
57: }
58:
59: if (fstat(fd, &st) == -1)
60: return -1;
61: if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
62: /*
63: * Note: The file system server can not handle the
64: * poniter type arguent for ioctl(). So, we have to
65: * invoke the ioctl here if the target file is a device.
66: */
67: err = device_ioctl(st.st_rdev, request, argp);
68: if (err != 0) {
69: errno = err;
70: return -1;
71: }
72: return 0;
73: }
74: /*
75: * Note:
76: * We can not know if the argument is pointer or int value.
77: * So, if it is an input request and its length is sizeof(int),
78: * we handle it as direct value.
79: */
80: if (((request & IOC_DIRMASK) == IOC_IN) && (size == sizeof(int)))
81: *((int *)m.buf) = (int)argp;
82: else if ((request & IOC_IN) && size && argp)
83: memcpy(&m.buf, argp, size);
84:
85: m.hdr.code = FS_IOCTL;
86: m.fd = fd;
87: m.request = request;
88: if (__posix_call(__fs_obj, &m, sizeof(m), 0) != 0)
89: return -1;
90: if ((request & IOC_OUT) && size && argp)
91: memcpy(argp, &m.buf, size);
92: return 0;
93: }
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