87d6caa69a
So the wayland client can still be built without installing UWAC as a dependency.
237 lines
5.3 KiB
C
237 lines
5.3 KiB
C
/*
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* Copyright © 2012 Collabora, Ltd.
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that copyright
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* notice and this permission notice appear in supporting documentation, and
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* that the name of the copyright holders not be used in advertising or
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* publicity pertaining to distribution of the software without specific,
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* written prior permission. The copyright holders make no representations
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* about the suitability of this software for any purpose. It is provided "as
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* is" without express or implied warranty.
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*
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*/
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/*
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* This file is an adaptation of src/wayland-os.h from the wayland project and
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* shared/os-compatiblity.h from the weston project.
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*
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* Functions have been renamed just to prevent name clashes.
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*/
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#define _GNU_SOURCE
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/epoll.h>
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#include "../config.h"
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#include "uwac-os.h"
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static int set_cloexec_or_close(int fd)
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{
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long flags;
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if (fd == -1)
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return -1;
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flags = fcntl(fd, F_GETFD);
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if (flags == -1)
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goto err;
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if (fcntl(fd, F_SETFD, flags | FD_CLOEXEC) == -1)
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goto err;
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return fd;
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err:
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close(fd);
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return -1;
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}
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int uwac_os_socket_cloexec(int domain, int type, int protocol)
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{
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int fd;
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fd = socket(domain, type | SOCK_CLOEXEC, protocol);
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if (fd >= 0)
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return fd;
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if (errno != EINVAL)
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return -1;
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fd = socket(domain, type, protocol);
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return set_cloexec_or_close(fd);
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}
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int uwac_os_dupfd_cloexec(int fd, long minfd)
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{
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int newfd;
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newfd = fcntl(fd, F_DUPFD_CLOEXEC, minfd);
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if (newfd >= 0)
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return newfd;
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if (errno != EINVAL)
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return -1;
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newfd = fcntl(fd, F_DUPFD, minfd);
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return set_cloexec_or_close(newfd);
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}
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static ssize_t recvmsg_cloexec_fallback(int sockfd, struct msghdr *msg, int flags)
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{
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ssize_t len;
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struct cmsghdr *cmsg;
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unsigned char *data;
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int *fd;
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int *end;
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len = recvmsg(sockfd, msg, flags);
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if (len == -1)
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return -1;
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if (!msg->msg_control || msg->msg_controllen == 0)
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return len;
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cmsg = CMSG_FIRSTHDR(msg);
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for (; cmsg != NULL; cmsg = CMSG_NXTHDR(msg, cmsg)) {
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if (cmsg->cmsg_level != SOL_SOCKET ||
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cmsg->cmsg_type != SCM_RIGHTS)
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continue;
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data = CMSG_DATA(cmsg);
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end = (int *)(data + cmsg->cmsg_len - CMSG_LEN(0));
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for (fd = (int *)data; fd < end; ++fd)
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*fd = set_cloexec_or_close(*fd);
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}
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return len;
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}
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ssize_t uwac_os_recvmsg_cloexec(int sockfd, struct msghdr *msg, int flags)
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{
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ssize_t len;
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len = recvmsg(sockfd, msg, flags | MSG_CMSG_CLOEXEC);
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if (len >= 0)
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return len;
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if (errno != EINVAL)
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return -1;
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return recvmsg_cloexec_fallback(sockfd, msg, flags);
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}
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int uwac_os_epoll_create_cloexec(void)
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{
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int fd;
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#ifdef EPOLL_CLOEXEC
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fd = epoll_create1(EPOLL_CLOEXEC);
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if (fd >= 0)
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return fd;
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if (errno != EINVAL)
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return -1;
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#endif
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fd = epoll_create(1);
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return set_cloexec_or_close(fd);
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}
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static int create_tmpfile_cloexec(char *tmpname)
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{
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int fd;
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#ifdef HAVE_MKOSTEMP
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fd = mkostemp(tmpname, O_CLOEXEC);
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if (fd >= 0)
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unlink(tmpname);
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#else
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fd = mkstemp(tmpname);
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if (fd >= 0) {
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fd = set_cloexec_or_close(fd);
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unlink(tmpname);
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}
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#endif
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return fd;
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}
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/*
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* Create a new, unique, anonymous file of the given size, and
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* return the file descriptor for it. The file descriptor is set
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* CLOEXEC. The file is immediately suitable for mmap()'ing
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* the given size at offset zero.
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*
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* The file should not have a permanent backing store like a disk,
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* but may have if XDG_RUNTIME_DIR is not properly implemented in OS.
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*
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* The file name is deleted from the file system.
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*
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* The file is suitable for buffer sharing between processes by
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* transmitting the file descriptor over Unix sockets using the
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* SCM_RIGHTS methods.
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*
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* If the C library implements posix_fallocate(), it is used to
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* guarantee that disk space is available for the file at the
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* given size. If disk space is insufficient, errno is set to ENOSPC.
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* If posix_fallocate() is not supported, program may receive
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* SIGBUS on accessing mmap()'ed file contents instead.
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*/
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int uwac_create_anonymous_file(off_t size)
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{
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static const char template[] = "/weston-shared-XXXXXX";
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const char *path;
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char *name;
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int fd;
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int ret;
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path = getenv("XDG_RUNTIME_DIR");
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if (!path) {
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errno = ENOENT;
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return -1;
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}
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name = malloc(strlen(path) + sizeof(template));
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if (!name)
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return -1;
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strcpy(name, path);
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strcat(name, template);
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fd = create_tmpfile_cloexec(name);
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free(name);
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if (fd < 0)
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return -1;
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#ifdef HAVE_POSIX_FALLOCATE
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ret = posix_fallocate(fd, 0, size);
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if (ret != 0) {
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close(fd);
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errno = ret;
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return -1;
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}
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#else
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ret = ftruncate(fd, size);
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if (ret < 0) {
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close(fd);
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return -1;
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}
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#endif
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return fd;
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}
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