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/*
* Copyright © 2020 Alexey Gladkov <gladkov.alexey@gmail.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <assert.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <linux/mount.h>
#include <linux/unistd.h>
static inline int fsopen(const char *fsname, unsigned int flags)
{
return syscall(__NR_fsopen, fsname, flags);
}
static inline int fsconfig(int fd, unsigned int cmd, const char *key, const void *val, int aux)
{
return syscall(__NR_fsconfig, fd, cmd, key, val, aux);
}
int main(void)
{
int fsfd, ret;
int hidepid = 2;
assert((fsfd = fsopen("proc", 0)) != -1);
ret = fsconfig(fsfd, FSCONFIG_SET_BINARY, "hidepid", &hidepid, 0);
assert(ret == -1);
assert(errno == EINVAL);
assert(!fsconfig(fsfd, FSCONFIG_SET_STRING, "hidepid", "2", 0));
assert(!fsconfig(fsfd, FSCONFIG_SET_STRING, "hidepid", "invisible", 0));
assert(!close(fsfd));
return 0;
}
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