Annotation of prex/usr/lib/posix/file/ioctl.c, Revision 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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