root / prex-0.9.0 / usr / lib / posix / file / ioctl.c @ 03e9c04a
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| 1 | 03e9c04a | Brad Neuman | /*
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| 2 | * Copyright (c) 2007, Kohsuke Ohtani
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | * 1. Redistributions of source code must retain the above copyright
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| 9 | * notice, this list of conditions and the following disclaimer.
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| 10 | * 2. Redistributions in binary form must reproduce the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer in the
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| 12 | * documentation and/or other materials provided with the distribution.
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| 13 | * 3. Neither the name of the author nor the names of any co-contributors
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| 14 | * may be used to endorse or promote products derived from this software
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| 15 | * without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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| 18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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| 21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 27 | * SUCH DAMAGE.
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| 28 | */
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| 29 | |||
| 30 | #include <sys/prex.h> |
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| 31 | #include <sys/posix.h> |
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| 32 | #include <ipc/fs.h> |
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| 33 | #include <sys/ioctl.h> |
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| 34 | |||
| 35 | #include <errno.h> |
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| 36 | #include <stdarg.h> |
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| 37 | #include <string.h> |
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| 38 | |||
| 39 | int
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| 40 | ioctl(int fd, unsigned long cmd, ...) |
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| 41 | {
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| 42 | struct ioctl_msg m;
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| 43 | char *argp;
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| 44 | va_list args; |
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| 45 | size_t size; |
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| 46 | int retval = 0; |
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| 47 | |||
| 48 | va_start(args, cmd); |
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| 49 | argp = va_arg(args, char *);
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| 50 | va_end(args); |
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| 51 | |||
| 52 | /*
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| 53 | * Check the parameter size
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| 54 | */
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| 55 | size = IOCPARM_LEN(cmd); |
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| 56 | if (size > IOCPARM_MAX) {
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| 57 | errno = EINVAL; |
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| 58 | return -1; |
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| 59 | } |
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| 60 | |||
| 61 | /*
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| 62 | * Check fault
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| 63 | */
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| 64 | if ((cmd & IOC_IN && (cmd & IOC_IVAL) == 0 && argp == NULL) || |
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| 65 | (cmd & IOC_OUT && (cmd & IOC_OVAL) == 0 && argp == NULL)) { |
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| 66 | errno = EFAULT; |
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| 67 | return -1; |
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| 68 | } |
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| 69 | |||
| 70 | /*
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| 71 | * Copy in
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| 72 | */
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| 73 | if (cmd & IOC_IN) {
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| 74 | if (cmd & IOC_IVAL)
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| 75 | *((int *)m.buf) = (int)argp; |
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| 76 | else
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| 77 | memcpy(&m.buf, argp, size); |
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| 78 | } |
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| 79 | |||
| 80 | m.hdr.code = FS_IOCTL; |
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| 81 | m.fd = fd; |
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| 82 | m.request = cmd; |
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| 83 | if (__posix_call(__fs_obj, &m, sizeof(m), 0) != 0) |
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| 84 | return -1; |
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| 85 | |||
| 86 | /*
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| 87 | * Copy out
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| 88 | */
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| 89 | if (cmd & IOC_OUT) {
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| 90 | if (cmd & IOC_OVAL)
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| 91 | retval = *((int *)m.buf);
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| 92 | else
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| 93 | memcpy(argp, &m.buf, size); |
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| 94 | } |
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| 95 | |||
| 96 | return retval;
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| 97 | } |