chromium/third_party/wayland/src/src/wayland-os.c

/*
 * Copyright © 2012 Collabora, Ltd.
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial
 * portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#define _GNU_SOURCE

#include "../config.h"

#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <sys/epoll.h>
#include <sys/mman.h>
#include <sys/un.h>
#ifdef HAVE_SYS_UCRED_H
#include <sys/ucred.h>
#endif

#include "wayland-os.h"

/* used by tests */
int (*wl_fcntl)(int fildes, int cmd, ...) = …;
int (*wl_socket)(int domain, int type, int protocol) = …;
ssize_t (*wl_recvmsg)(int socket, struct msghdr *message, int flags) = …;
int (*wl_epoll_create1)(int flags) = …;

static int
set_cloexec_or_close(int fd)
{ … }

int
wl_os_socket_cloexec(int domain, int type, int protocol)
{ … }

#if defined(__FreeBSD__)
int
wl_os_socket_peercred(int sockfd, uid_t *uid, gid_t *gid, pid_t *pid)
{
	socklen_t len;
	struct xucred ucred;

	len = sizeof(ucred);
	if (getsockopt(sockfd, SOL_LOCAL, LOCAL_PEERCRED, &ucred, &len) < 0 ||
	    ucred.cr_version != XUCRED_VERSION)
		return -1;
	*uid = ucred.cr_uid;
	*gid = ucred.cr_gid;
#if HAVE_XUCRED_CR_PID
	/* Since https://cgit.freebsd.org/src/commit/?id=c5afec6e895a */
	*pid = ucred.cr_pid;
#else
	*pid = 0;
#endif
	return 0;
}
#elif defined(SO_PEERCRED)
int
wl_os_socket_peercred(int sockfd, uid_t *uid, gid_t *gid, pid_t *pid)
{ … }
#else
#error "Don't know how to read ucred on this platform"
#endif

int
wl_os_dupfd_cloexec(int fd, int minfd)
{ … }

static ssize_t
recvmsg_cloexec_fallback(int sockfd, struct msghdr *msg, int flags)
{ … }

ssize_t
wl_os_recvmsg_cloexec(int sockfd, struct msghdr *msg, int flags)
{ … }

int
wl_os_epoll_create_cloexec(void)
{ … }

int
wl_os_accept_cloexec(int sockfd, struct sockaddr *addr, socklen_t *addrlen)
{ … }

/*
 * Fallback function for operating systems that don't implement
 * mremap(MREMAP_MAYMOVE).
 */
void *
wl_os_mremap_maymove(int fd, void *old_data, ssize_t *old_size,
		     ssize_t new_size, int prot, int flags)
{ … }