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16#include <assert.h>
17#include <unistd.h>
18#include <stdlib.h>
19#include <errno.h>
20#include <linux/mount.h>
21#include <linux/unistd.h>
22
23static inline int fsopen(const char *fsname, unsigned int flags)
24{
25 return syscall(__NR_fsopen, fsname, flags);
26}
27
28static inline int fsconfig(int fd, unsigned int cmd, const char *key, const void *val, int aux)
29{
30 return syscall(__NR_fsconfig, fd, cmd, key, val, aux);
31}
32
33int main(void)
34{
35 int fsfd, ret;
36 int hidepid = 2;
37
38 assert((fsfd = fsopen("proc", 0)) != -1);
39
40 ret = fsconfig(fsfd, FSCONFIG_SET_BINARY, "hidepid", &hidepid, 0);
41 assert(ret == -1);
42 assert(errno == EINVAL);
43
44 assert(!fsconfig(fsfd, FSCONFIG_SET_STRING, "hidepid", "2", 0));
45 assert(!fsconfig(fsfd, FSCONFIG_SET_STRING, "hidepid", "invisible", 0));
46
47 assert(!close(fsfd));
48
49 return 0;
50}
51