Attachment 34909 Details for Bug 24253 – read the input event

read the input event

read-input-event.c (text/x-csrc), 1.36 KB, created by zhang rui on 2010-04-12 02:02:27 UTC

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Creator: zhang rui

Created: 2010-04-12 02:02:27 UTC

Size: 1.36 KB

patch

obsolete

>/* According to POSIX 1003.1-2001 */
>#include <sys/select.h>
>
>/* According to earlier standards */
>#include <sys/time.h>
>#include <sys/types.h>
>#include <stdio.h>
>#include <stdlib.h>
>#include <fcntl.h>
>#include <unistd.h> 
>
>struct event {
>	struct timeval time;
>	unsigned short type;
>	unsigned short code;
>	unsigned int value;
>};
>
>static const char *default_path = "/dev/input/event0";
>
>int main (int argc, char* argv[])
>{
>	char *path;
>	int fd;
>	fd_set rfds;
>	struct timeval tv;
>	struct event event;
>	int count;
>	int ret;
>	int index = 0;
>
>	if (argc == 1)
>		return -1;
>
>	path = argv[1];
>
>	if (!strncmp(default_path, path, 16))
>		index = path[16] - default_path[16];
>
>	fd = open(path, O_RDONLY);
>
>	/* Watch stdin (fd 0) to see when it has input. */
>	FD_ZERO(&rfds);
>	FD_SET(fd, &rfds);
>
>repeat:
>	/* Wait up to five seconds. */
>	tv.tv_sec = 10;
>	tv.tv_usec = 0;
>
>	ret = select(fd + 1, &rfds, NULL, NULL, &tv);
>	/* Don't rely on the value of tv now! */
>	if (ret) {
>		count = read(fd, &event, sizeof (struct event));
>		if (count != sizeof(struct event)) {
>			fprintf(stdout, "read %d bytes, expect %d bytes\n", count, sizeof(struct event));
>			return -1;
>		}
>		fprintf(stdout, "event[%d] type %04u, code %04u, value %08u\n", index, event.type, event.code, event.value);
>		goto repeat;
>	}
>	/* FD_ISSET(0, &rfds) will be true. */
>	else
>		fprintf(stdout, "No data within ten seconds.\n");
>
>	return 0;
>}

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Attachments on bug 24253: 30418 | 34909 | 34919 | 34920

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