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/*
* Copyright (c) 2008, The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google, Inc. nor the names of its contributors
* may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <errno.h>
#include <error.h>
#include <fcntl.h>
#include <getopt.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <unistd.h>
static void usage() {
fprintf(stderr, "%s [-l <length>] [-a <argsize>] [-rdh] <device> <ioctlnr>\n"
" -l <length> Length of io buffer\n"
" -a <argsize> Size of each argument (1-8)\n"
" -r Open device in read only mode\n"
" -d Direct argument (no iobuffer)\n"
" -h Print help\n", getprogname());
exit(1);
}
static int xstrtoi(const char* s, const char* what) {
char* endp;
errno = 0;
long result = strtol(s, &endp, 0);
if (errno != 0 || *endp != '\0') {
error(1, errno, "couldn't parse %s '%s'", what, s);
}
if (result > INT_MAX || result < INT_MIN) {
error(1, errno, "%s '%s' out of range", what, s);
}
return result;
}
int ioctl_main(int argc, char* argv[]) {
int read_only = 0;
int length = -1;
int arg_size = 4;
int direct_arg = 0;
void *ioctl_args = NULL;
uint8_t *ioctl_argp;
uint8_t *ioctl_argp_save = NULL;
int rem;
int c;
while ((c = getopt(argc, argv, "rdl:a:h")) != -1) {
switch (c) {
case 'r':
read_only = 1;
break;
case 'd':
direct_arg = 1;
break;
case 'l':
length = xstrtoi(optarg, "length");
break;
case 'a':
arg_size = xstrtoi(optarg, "argument size");
break;
case 'h':
usage();
break;
default:
error(1, 0, "invalid option -%c", optopt);
}
}
if (optind + 2 > argc) {
usage();
}
const char* device = argv[optind];
int fd;
if (strcmp(device, "-") == 0) {
fd = STDIN_FILENO;
} else {
fd = open(device, read_only ? O_RDONLY : (O_RDWR | O_SYNC));
if (fd == -1) {
error(1, errno, "cannot open %s", argv[optind]);
}
}
optind++;
// IOCTL(2) wants second parameter as a signed int.
// Let's let the user specify either negative numbers or large positive
// numbers, for the case where ioctl number is larger than INT_MAX.
errno = 0;
char* endp;
int ioctl_nr = UINT_MAX & strtoll(argv[optind], &endp, 0);
if (errno != 0 || *endp != '\0') {
error(1, errno, "couldn't parse ioctl number '%s'", argv[optind]);
}
optind++;
if(direct_arg) {
arg_size = 4;
length = 4;
}
if(length < 0) {
length = (argc - optind) * arg_size;
}
if(length) {
ioctl_args = calloc(1, length);
ioctl_argp_save = ioctl_argp = ioctl_args;
rem = length;
while (optind < argc) {
uint64_t tmp = strtoull(argv[optind], NULL, 0);
if (rem < arg_size) {
error(1, 0, "too many arguments");
}
memcpy(ioctl_argp, &tmp, arg_size);
ioctl_argp += arg_size;
rem -= arg_size;
optind++;
}
}
printf("sending ioctl 0x%x", ioctl_nr);
rem = length;
while(rem--) {
printf(" 0x%02x", *ioctl_argp_save++);
}
printf(" to %s\n", device);
int res;
if(direct_arg)
res = ioctl(fd, ioctl_nr, *(uint32_t*)ioctl_args);
else if(length)
res = ioctl(fd, ioctl_nr, ioctl_args);
else
res = ioctl(fd, ioctl_nr, 0);
if (res < 0) {
free(ioctl_args);
error(1, errno, "ioctl 0x%x failed (returned %d)", ioctl_nr, res);
}
if (length) {
printf("return buf:");
ioctl_argp = ioctl_args;
rem = length;
while(rem--) {
printf(" %02x", *ioctl_argp++);
}
printf("\n");
}
free(ioctl_args);
close(fd);
return 0;
}
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