[PATCH] server: Try to retrieve the unix name on handles created from file descriptors.

[Gabriel Ivăncescu]

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=46070
Signed-off-by: Gabriel Ivăncescu <gabrielopcode(a)gmail.com>
---

It also fixes the game Unity of Command II (same bug).

 server/fd.c   | 39 +++++++++++++++++++++++++++++++++++++++
 server/file.c |  1 +
 server/file.h |  2 ++
 3 files changed, 42 insertions(+)

diff --git a/server/fd.c b/server/fd.c
index 5d80e21..2530287 100644
--- a/server/fd.c
+++ b/server/fd.c
@@ -1922,6 +1922,45 @@ struct fd *create_anonymous_fd( const struct fd_ops *fd_user_ops, int unix_fd, s
     return NULL;
 }
 
+void set_unix_name_of_fd( struct fd *fd, const struct stat *fd_st )
+{
+#ifdef __linux__
+    static const char procfs_fmt[] = "/proc/self/fd/%d";
+
+    char path[PATH_MAX], procfs_path[sizeof(procfs_fmt) - 2 /* %d */ + 11];
+    struct stat path_st;
+    ssize_t len;
+
+    sprintf( procfs_path, procfs_fmt, fd->unix_fd );
+    len = readlink( procfs_path, path, sizeof(path) );
+    if (len == -1 || len >= sizeof(path) )
+        return;
+    path[len] = '\0';
+
+    /* Make sure it's an absolute path, has at least one hardlink, and the same inode */
+    if (path[0] != '/' || stat( path, &path_st ) || path_st.st_nlink < 1 ||
+        path_st.st_dev != fd_st->st_dev || path_st.st_ino != fd_st->st_ino)
+        return;
+
+    if (!(fd->unix_name = mem_alloc( len + 1 )))
+        return;
+    memcpy( fd->unix_name, path, len + 1 );
+
+#elif defined(F_GETPATH)
+    char path[PATH_MAX];
+    size_t size;
+
+    if (fcntl( fd->unix_fd, F_GETPATH, path ) == -1 || path[0] != '/')
+        return;
+
+    size = strlen(path) + 1;
+    if (!(fd->unix_name = mem_alloc( size )))
+        return;
+    memcpy( fd->unix_name, path, size );
+
+#endif
+}
+
 /* retrieve the object that is using an fd */
 void *get_fd_user( struct fd *fd )
 {
diff --git a/server/file.c b/server/file.c
index 71b8448..1db6c7c 100644
--- a/server/file.c
+++ b/server/file.c
@@ -145,6 +145,7 @@ struct file *create_file_for_fd( int fd, unsigned int access, unsigned int shari
         release_object( file );
         return NULL;
     }
+    set_unix_name_of_fd( file->fd, &st );
     allow_fd_caching( file->fd );
     return file;
 }
diff --git a/server/file.h b/server/file.h
index 4341ad3..5c6054b 100644
--- a/server/file.h
+++ b/server/file.h
@@ -22,6 +22,7 @@
 #define __WINE_SERVER_FILE_H
 
 #include <sys/types.h>
+#include <sys/stat.h>
 
 #include "object.h"
 
@@ -82,6 +83,7 @@ extern struct fd *open_fd( struct fd *root, const char *name, int flags, mode_t
                            unsigned int access, unsigned int sharing, unsigned int options );
 extern struct fd *create_anonymous_fd( const struct fd_ops *fd_user_ops,
                                        int unix_fd, struct object *user, unsigned int options );
+extern void set_unix_name_of_fd( struct fd *fd, const struct stat *fd_st );
 extern struct fd *dup_fd_object( struct fd *orig, unsigned int access, unsigned int sharing,
                                  unsigned int options );
 extern struct fd *get_fd_object_for_mapping( struct fd *fd, unsigned int access, unsigned int sharing );
-- 
2.21.0