linux c tool系列------sendevent.c

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#include <errno.h>#include <fcntl.h>#include <linux/input.h>#include <stdint.h>#include <stdio.h>#include <stdlib.h>#include <string.h>#include <sys/ioctl.h>#include <unistd.h>int sendevent_main(int argc, char *argv[]){    int fd;    ssize_t ret;    int version;    struct input_event event;    if(argc != 5) {        fprintf(stderr, "use: %s device type code value\n", argv[0]);        return 1;    }    fd = open(argv[1], O_RDWR);    if(fd < 0) {        fprintf(stderr, "could not open %s, %s\n", argv[optind], strerror(errno));        return 1;    }    if (ioctl(fd, EVIOCGVERSION, &version)) {        fprintf(stderr, "could not get driver version for %s, %s\n", argv[optind], strerror(errno));        return 1;    }    memset(&event, 0, sizeof(event));    event.type = atoi(argv[2]);    event.code = atoi(argv[3]);    event.value = atoi(argv[4]);    ret = write(fd, &event, sizeof(event));    if(ret < (ssize_t) sizeof(event)) {        fprintf(stderr, "write event failed, %s\n", strerror(errno));        return -1;    }    return 0;}

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