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/*
* SYSCALL_DEFINE4(epoll_ctl, int, epfd, int, op, int, fd, struct epoll_event __user *, event)
*
* When successful, epoll_ctl() returns zero.
* When an error occurs, epoll_ctl() returns -1 and errno is set appropriately.
*/
#include <sys/epoll.h>
#include "fd.h"
#include "sanitise.h"
#include "random.h"
#include "utils.h"
#include "compat.h"
#ifndef EPOLLEXCLUSIVE
#define EPOLLEXCLUSIVE (1 << 28)
#endif
static const unsigned long epoll_flags[] = {
EPOLLIN, EPOLLOUT, EPOLLRDHUP, EPOLLPRI,
EPOLLERR, EPOLLHUP, EPOLLET, EPOLLONESHOT,
EPOLLWAKEUP, EPOLLEXCLUSIVE,
};
static void sanitise_epoll_ctl(struct syscallrecord *rec)
{
struct epoll_event *ep;
ep = zmalloc(sizeof(struct epoll_event));
ep->data.fd = get_random_fd();
ep->events = set_rand_bitmask(ARRAY_SIZE(epoll_flags), epoll_flags);
rec->a4 = (unsigned long) ep;
}
static void post_epoll_ctl(struct syscallrecord *rec)
{
free((void *)rec->a4);
}
static unsigned long epoll_ctl_ops[] = {
EPOLL_CTL_ADD, EPOLL_CTL_MOD, EPOLL_CTL_DEL,
};
struct syscallentry syscall_epoll_ctl = {
.name = "epoll_ctl",
.num_args = 4,
.arg1name = "epfd",
.arg1type = ARG_FD,
.arg2name = "op",
.arg2type = ARG_OP,
.arg2list = ARGLIST(epoll_ctl_ops),
.arg3name = "fd",
.arg3type = ARG_FD,
.arg4name = "event",
.rettype = RET_ZERO_SUCCESS,
.flags = NEED_ALARM,
.sanitise = sanitise_epoll_ctl,
.post = post_epoll_ctl,
};
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