3rd-party/linux-kernel-module-cheat
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ioctl: move doc to README

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This commit is contained in:
Ciro Santilli
2018-07-01 17:44:38 +01:00
parent 084e3faf5a
commit d840b0cb65
7 changed files with 107 additions and 51 deletions
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60
kernel_module/user/ioctl.c
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@@ -1,3 +1,5 @@
/* https://github.com/cirosantilli/linux-kernel-module-cheat#ioctl */
#define _GNU_SOURCE
#include <errno.h>
#include <fcntl.h>
@@ -12,43 +14,53 @@
int main(int argc, char **argv)
{
int fd, arg_int, ret;
char *ioctl_path;
int fd, request, arg0, arg1, arg_int, ret;
lkmc_ioctl_struct arg_struct;
if (argc < 2) {
puts("Usage: ./prog <ioctl-file>");
puts("Usage: ./prog <ioctl-file> <request> [<arg>...]");
return EXIT_FAILURE;
}
fd = open(argv[1], O_RDONLY);
ioctl_path = argv[1];
request = strtol(argv[2], NULL, 10);
if (argc > 3) {
arg0 = strtol(argv[3], NULL, 10);
}
if (argc > 4) {
arg1 = strtol(argv[4], NULL, 10);
}
fd = open(ioctl_path, O_RDONLY);
if (fd == -1) {
perror("open");
return EXIT_FAILURE;
}
/* 0 */
switch (request)
{
arg_int = 1;
ret = ioctl(fd, LKMC_IOCTL_INC, &arg_int);
if (ret == -1) {
perror("ioctl");
case 0:
arg_int = arg0;
ret = ioctl(fd, LKMC_IOCTL_INC, &arg_int);
if (ret != -1) {
printf("%d\n", arg_int);
}
break;
case 1:
arg_struct.i = arg0;
arg_struct.j = arg1;
ret = ioctl(fd, LKMC_IOCTL_INC_DEC, &arg_struct);
if (ret != -1) {
printf("%d %d\n", arg_struct.i, arg_struct.j);
}
break;
default:
puts("error: unknown request");
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);
if (ret == -1) {
perror("ioctl");
printf("errno = %d\n", errno);
return EXIT_FAILURE;
}
close(fd);
return EXIT_SUCCESS;