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ioctl example complete!

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This commit is contained in:
Ciro Santilli
2017-06-12 08:53:28 +01:00
parent 95a1840683
commit 7d2f79dec9
3 changed files with 96 additions and 17 deletions
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34
kernel_module/user/ioctl.c
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@@ -12,7 +12,8 @@
int main(int argc, char **argv)
{
int fd, ret;
int fd, arg_int, ret;
lkmc_ioctl_struct arg_struct;
if (argc < 4) {
puts("Usage: ./prog <ioctl-file> <cmd> <arg>");
@@ -23,13 +24,32 @@ int main(int argc, char **argv)
perror("open");
return EXIT_FAILURE;
}
ret = ioctl(fd, IOCTL0, argv[3]);
if (ret == -1) {
perror("ioctl");
return EXIT_FAILURE;
/* 0 */
{
arg_int = 1;
ret = ioctl(fd, LKMC_IOCTL_INC, &arg_int);
if (ret == -1) {
perror("ioctl");
return EXIT_FAILURE;
}
printf("arg = %d\n", arg_int);
printf("ret = %d\n", ret);
printf("errno = %d\n", errno);
}
puts("");
/* 1 */
{
arg_struct.i = 1;
arg_struct.j = 1;
ret = ioctl(fd, LKMC_IOCTL_INC_DEC, &arg_struct);
if (ret == -1) {
perror("ioctl");
return EXIT_FAILURE;
}
printf("arg = %d %d\n", arg_struct.i, arg_struct.j);
printf("ret = %d\n", ret);
printf("errno = %d\n", errno);
}
printf("ret = %d\n", ret);
printf("errno = %d\n", errno);
close(fd);
return EXIT_SUCCESS;
}