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/*
* Copyright © 2012 Collabora, Ltd.
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that copyright
* notice and this permission notice appear in supporting documentation, and
* that the name of the copyright holders not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. The copyright holders make no representations
* about the suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*
* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, 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.
*/
#define _GNU_SOURCE
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/epoll.h>
#include "../config.h"
#include "wayland-os.h"
static int
set_cloexec_or_close(int fd)
{
long flags;
if (fd == -1)
return -1;
flags = fcntl(fd, F_GETFD);
if (flags == -1)
goto err;
if (fcntl(fd, F_SETFD, flags | FD_CLOEXEC) == -1)
goto err;
return fd;
err:
close(fd);
return -1;
}
int
wl_os_socket_cloexec(int domain, int type, int protocol)
{
int fd;
fd = socket(domain, type | SOCK_CLOEXEC, protocol);
if (fd >= 0)
return fd;
if (errno != EINVAL)
return -1;
fd = socket(domain, type, protocol);
return set_cloexec_or_close(fd);
}
int
wl_os_dupfd_cloexec(int fd, long minfd)
{
int newfd;
newfd = fcntl(fd, F_DUPFD_CLOEXEC, minfd);
if (newfd >= 0)
return newfd;
if (errno != EINVAL)
return -1;
newfd = fcntl(fd, F_DUPFD, minfd);
return set_cloexec_or_close(newfd);
}
static ssize_t
recvmsg_cloexec_fallback(int sockfd, struct msghdr *msg, int flags)
{
ssize_t len;
struct cmsghdr *cmsg;
unsigned char *data;
int *fd;
int *end;
len = recvmsg(sockfd, msg, flags);
if (len == -1)
return -1;
if (!msg->msg_control || msg->msg_controllen == 0)
return len;
cmsg = CMSG_FIRSTHDR(msg);
for (; cmsg != NULL; cmsg = CMSG_NXTHDR(msg, cmsg)) {
if (cmsg->cmsg_level != SOL_SOCKET ||
cmsg->cmsg_type != SCM_RIGHTS)
continue;
data = CMSG_DATA(cmsg);
end = (int *)(data + cmsg->cmsg_len - CMSG_LEN(0));
for (fd = (int *)data; fd < end; ++fd)
*fd = set_cloexec_or_close(*fd);
}
return len;
}
ssize_t
wl_os_recvmsg_cloexec(int sockfd, struct msghdr *msg, int flags)
{
ssize_t len;
len = recvmsg(sockfd, msg, flags | MSG_CMSG_CLOEXEC);
if (len >= 0)
return len;
if (errno != EINVAL)
return -1;
return recvmsg_cloexec_fallback(sockfd, msg, flags);
}
int
wl_os_epoll_create_cloexec(void)
{
int fd;
#ifdef EPOLL_CLOEXEC
fd = epoll_create1(EPOLL_CLOEXEC);
if (fd >= 0)
return fd;
if (errno != EINVAL)
return -1;
#endif
fd = epoll_create(1);
return set_cloexec_or_close(fd);
}
int
wl_os_accept_cloexec(int sockfd, struct sockaddr *addr, socklen_t *addrlen)
{
int fd;
#ifdef HAVE_ACCEPT4
fd = accept4(sockfd, addr, addrlen, SOCK_CLOEXEC);
if (fd >= 0)
return fd;
if (errno != ENOSYS)
return -1;
#endif
fd = accept(sockfd, addr, addrlen);
return set_cloexec_or_close(fd);
}
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