mirror of
https://github.com/mpv-player/mpv
synced 2024-12-28 01:52:19 +00:00
a049a3240e
POSIX leaves poll() behavior on directories unspecified. While on Linux, it seems to behave the same way as regular files (always return immediately), this is not guaranteed. At least with OSX 10.12, it seems to wait, which essentially means that opening directories will "hang". Fixes #3530 and #3649.
331 lines
8.9 KiB
C
331 lines
8.9 KiB
C
/*
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* Original authors: Albeu, probably Arpi
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*
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* This file is part of mpv.
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*
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* mpv is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* mpv is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with mpv. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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#ifndef __MINGW32__
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#include <poll.h>
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#endif
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#include "osdep/io.h"
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#include "common/common.h"
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#include "common/msg.h"
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#include "stream.h"
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#include "options/m_option.h"
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#include "options/path.h"
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#if HAVE_BSD_FSTATFS
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#include <sys/param.h>
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#include <sys/mount.h>
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#endif
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#if HAVE_LINUX_FSTATFS
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#include <sys/vfs.h>
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#endif
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#ifdef _WIN32
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#include <windows.h>
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#include <winternl.h>
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#include <io.h>
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#ifndef FILE_REMOTE_DEVICE
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#define FILE_REMOTE_DEVICE (0x10)
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#endif
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#endif
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struct priv {
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int fd;
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bool close;
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bool use_poll;
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};
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static int fill_buffer(stream_t *s, char *buffer, int max_len)
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{
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struct priv *p = s->priv;
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#ifndef __MINGW32__
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if (p->use_poll) {
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int c = s->cancel ? mp_cancel_get_fd(s->cancel) : -1;
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struct pollfd fds[2] = {
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{.fd = p->fd, .events = POLLIN},
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{.fd = c, .events = POLLIN},
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};
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poll(fds, c >= 0 ? 2 : 1, -1);
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if (fds[1].revents & POLLIN)
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return -1;
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}
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#endif
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int r = read(p->fd, buffer, max_len);
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return (r <= 0) ? -1 : r;
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}
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static int write_buffer(stream_t *s, char *buffer, int len)
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{
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struct priv *p = s->priv;
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int r;
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int wr = 0;
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while (wr < len) {
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r = write(p->fd, buffer, len);
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if (r <= 0)
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return -1;
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wr += r;
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buffer += r;
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}
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return len;
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}
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static int seek(stream_t *s, int64_t newpos)
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{
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struct priv *p = s->priv;
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return lseek(p->fd, newpos, SEEK_SET) != (off_t)-1;
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}
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static int control(stream_t *s, int cmd, void *arg)
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{
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struct priv *p = s->priv;
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switch (cmd) {
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case STREAM_CTRL_GET_SIZE: {
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off_t size = lseek(p->fd, 0, SEEK_END);
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lseek(p->fd, s->pos, SEEK_SET);
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if (size != (off_t)-1) {
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*(int64_t *)arg = size;
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return 1;
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}
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break;
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}
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}
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return STREAM_UNSUPPORTED;
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}
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static void s_close(stream_t *s)
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{
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struct priv *p = s->priv;
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if (p->close && p->fd >= 0)
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close(p->fd);
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}
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// If url is a file:// URL, return the local filename, otherwise return NULL.
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char *mp_file_url_to_filename(void *talloc_ctx, bstr url)
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{
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bstr proto = mp_split_proto(url, &url);
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if (bstrcasecmp0(proto, "file") != 0)
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return NULL;
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char *filename = bstrto0(talloc_ctx, url);
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mp_url_unescape_inplace(filename);
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#if HAVE_DOS_PATHS
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// extract '/' from '/x:/path'
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if (filename[0] == '/' && filename[1] && filename[2] == ':')
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memmove(filename, filename + 1, strlen(filename)); // including \0
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#endif
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return filename;
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}
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// Return talloc_strdup's filesystem path if local, otherwise NULL.
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// Unlike mp_file_url_to_filename(), doesn't return NULL if already local.
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char *mp_file_get_path(void *talloc_ctx, bstr url)
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{
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if (mp_split_proto(url, &(bstr){0}).len) {
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return mp_file_url_to_filename(talloc_ctx, url);
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} else {
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return bstrto0(talloc_ctx, url);
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}
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}
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#if HAVE_BSD_FSTATFS
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static bool check_stream_network(int fd)
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{
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struct statfs fs;
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const char *stypes[] = { "afpfs", "nfs", "smbfs", "webdav", NULL };
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if (fstatfs(fd, &fs) == 0)
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for (int i=0; stypes[i]; i++)
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if (strcmp(stypes[i], fs.f_fstypename) == 0)
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return true;
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return false;
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}
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#elif HAVE_LINUX_FSTATFS
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static bool check_stream_network(int fd)
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{
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struct statfs fs;
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const uint32_t stypes[] = {
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0x5346414F /*AFS*/, 0x61756673 /*AUFS*/, 0x00C36400 /*CEPH*/,
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0xFF534D42 /*CIFS*/, 0x73757245 /*CODA*/, 0x19830326 /*FHGFS*/,
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0x65735546 /*FUSEBLK*/,0x65735543 /*FUSECTL*/,0x1161970 /*GFS*/,
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0x47504653 /*GPFS*/, 0x6B414653 /*KAFS*/, 0x0BD00BD0 /*LUSTRE*/,
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0x564C /*NCP*/, 0x6969 /*NFS*/, 0x6E667364 /*NFSD*/,
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0xAAD7AAEA /*PANFS*/, 0x50495045 /*PIPEFS*/, 0x517B /*SMB*/,
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0xBEEFDEAD /*SNFS*/, 0xBACBACBC /*VMHGFS*/, 0x7461636f /*OCFS2*/,
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0
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};
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if (fstatfs(fd, &fs) == 0) {
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for (int i=0; stypes[i]; i++) {
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if (stypes[i] == fs.f_type)
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return true;
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}
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}
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return false;
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}
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#elif defined(_WIN32)
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static bool check_stream_network(int fd)
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{
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NTSTATUS (NTAPI *pNtQueryVolumeInformationFile)(HANDLE,
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PIO_STATUS_BLOCK, PVOID, ULONG, FS_INFORMATION_CLASS) = NULL;
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// NtQueryVolumeInformationFile is an internal Windows function. It has
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// been present since Windows XP, however this code should fail gracefully
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// if it's removed from a future version of Windows.
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HMODULE ntdll = GetModuleHandleW(L"ntdll.dll");
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pNtQueryVolumeInformationFile = (NTSTATUS (NTAPI*)(HANDLE,
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PIO_STATUS_BLOCK, PVOID, ULONG, FS_INFORMATION_CLASS))
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GetProcAddress(ntdll, "NtQueryVolumeInformationFile");
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if (!pNtQueryVolumeInformationFile)
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return false;
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HANDLE h = (HANDLE)_get_osfhandle(fd);
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if (h == INVALID_HANDLE_VALUE)
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return false;
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FILE_FS_DEVICE_INFORMATION info = { 0 };
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IO_STATUS_BLOCK io;
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NTSTATUS status = pNtQueryVolumeInformationFile(h, &io, &info,
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sizeof(info), FileFsDeviceInformation);
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if (!NT_SUCCESS(status))
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return false;
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return info.DeviceType == FILE_DEVICE_NETWORK_FILE_SYSTEM ||
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(info.Characteristics & FILE_REMOTE_DEVICE);
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}
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#else
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static bool check_stream_network(int fd)
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{
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return false;
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}
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#endif
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static int open_f(stream_t *stream)
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{
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struct priv *p = talloc_ptrtype(stream, p);
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*p = (struct priv) {
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.fd = -1
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};
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stream->priv = p;
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stream->type = STREAMTYPE_FILE;
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bool write = stream->mode == STREAM_WRITE;
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int m = O_CLOEXEC | (write ? O_RDWR | O_CREAT | O_TRUNC : O_RDONLY);
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char *filename = mp_file_url_to_filename(stream, bstr0(stream->url));
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if (filename) {
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stream->path = filename;
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} else {
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filename = stream->path;
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}
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if (strncmp(stream->url, "fd://", 5) == 0) {
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char *end = NULL;
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p->fd = strtol(stream->url + 5, &end, 0);
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if (!end || end == stream->url + 5 || end[0]) {
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MP_ERR(stream, "Invalid FD: %s\n", stream->url);
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return STREAM_ERROR;
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}
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p->close = false;
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} else if (!strcmp(filename, "-")) {
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if (!write) {
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MP_INFO(stream, "Reading from stdin...\n");
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p->fd = 0;
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} else {
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MP_INFO(stream, "Writing to stdout...\n");
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p->fd = 1;
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}
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p->close = false;
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} else {
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mode_t openmode = S_IRUSR | S_IWUSR;
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#ifndef __MINGW32__
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openmode |= S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH;
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if (!write)
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m |= O_NONBLOCK;
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p->use_poll = true;
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#endif
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p->fd = open(filename, m | O_BINARY, openmode);
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if (p->fd < 0) {
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MP_ERR(stream, "Cannot open file '%s': %s\n",
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filename, mp_strerror(errno));
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return STREAM_ERROR;
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}
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struct stat st;
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if (fstat(p->fd, &st) == 0) {
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if (S_ISDIR(st.st_mode)) {
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p->use_poll = false;
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stream->type = STREAMTYPE_DIR;
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stream->allow_caching = false;
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MP_INFO(stream, "This is a directory - adding to playlist.\n");
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}
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#ifndef __MINGW32__
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if (S_ISREG(st.st_mode)) {
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p->use_poll = false;
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// O_NONBLOCK has weird semantics on file locks; remove it.
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int val = fcntl(p->fd, F_GETFL) & ~(unsigned)O_NONBLOCK;
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fcntl(p->fd, F_SETFL, val);
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}
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#endif
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}
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p->close = true;
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}
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#ifdef __MINGW32__
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setmode(p->fd, O_BINARY);
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#endif
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off_t len = lseek(p->fd, 0, SEEK_END);
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lseek(p->fd, 0, SEEK_SET);
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if (len != (off_t)-1) {
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stream->seek = seek;
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stream->seekable = true;
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}
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stream->fast_skip = true;
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stream->fill_buffer = fill_buffer;
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stream->write_buffer = write_buffer;
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stream->control = control;
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stream->read_chunk = 64 * 1024;
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stream->close = s_close;
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if (check_stream_network(p->fd))
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stream->streaming = true;
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return STREAM_OK;
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}
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const stream_info_t stream_info_file = {
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.name = "file",
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.open = open_f,
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.protocols = (const char*const[]){ "file", "", "fd", NULL },
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.can_write = true,
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.is_safe = true,
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};
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