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/*****************************************************************************
* Copyright (C) 2013 Red Hat, Inc
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
****************************************************************************/
#define _GNU_SOURCE
#include <linux/input.h>
#include <limits.h>
#include <dirent.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#ifdef __GLIBC__
// versionsort sorts the device names in proper numerical order (e.g. so that
// event10 is listed after event9, not event1), but is only available in glibc.
static int (*sort_fn)(const struct dirent **, const struct dirent **) = versionsort;
#else
// Fall back to basic alphabetical sorting for other libc implementations.
static int (*sort_fn)(const struct dirent **, const struct dirent **) = alphasort;
#endif
#define DEV_INPUT_EVENT "/dev/input"
#define EVENT_DEV_NAME "event"
static int is_event_device(const struct dirent *dir) {
return strncmp(EVENT_DEV_NAME, dir->d_name, 5) == 0;
}
char* find_event_devices(void)
{
struct dirent **namelist;
int i, ndev, devnum;
char *filename;
int max_device = 0;
int rc;
ndev = scandir(DEV_INPUT_EVENT, &namelist, is_event_device, sort_fn);
if (ndev <= 0)
return NULL;
fprintf(stderr, "Available devices:\n");
for (i = 0; i < ndev; i++)
{
char fname[PATH_MAX];
int fd = -1;
char name[256] = "???";
snprintf(fname, sizeof(fname),
"%s/%s", DEV_INPUT_EVENT, namelist[i]->d_name);
fd = open(fname, O_RDONLY);
if (fd < 0)
continue;
ioctl(fd, EVIOCGNAME(sizeof(name)), name);
fprintf(stderr, "%s: %s\n", fname, name);
close(fd);
rc = sscanf(namelist[i]->d_name, "event%d", &devnum);
if (rc == 1 && devnum > max_device)
max_device = devnum;
free(namelist[i]);
}
fprintf(stderr, "Select the device event number [0-%d]: ", max_device);
rc = scanf("%d", &devnum);
if (rc != 1 || devnum > max_device || devnum < 0)
return NULL;
rc = asprintf(&filename, "%s/%s%d",
DEV_INPUT_EVENT, EVENT_DEV_NAME,
devnum);
return rc == -1 ? NULL : filename;
}
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