// Open a file descriptor, based on a file.
public static int __syscall_open(IntPtr path, int mode, int access)
{
int fd;
Stream stream = null;
// Reserve a slot in the file descriptor table.
fd = FileTable.AllocFD();
if (fd == -1)
{
return(-24); /* EMFILE */
}
// Open the file stream.
try
{
String name = Marshal.PtrToStringAnsi(path);
stream = new FileStream
(name, (FileMode)mode, (FileAccess)access);
}
catch (SecurityException)
{
return(-13); /* EACCES */
}
catch (FileNotFoundException)
{
return(-2); /* ENOENT */
}
catch (DirectoryNotFoundException)
{
return(-20); /* ENOTDIR */
}
catch (PathTooLongException)
{
return(-36); /* ENAMETOOLONG */
}
catch (UnauthorizedAccessException)
{
return(-13); /* EACCES */
}
catch (IOException)
{
// Could be anything, but EEXIST is most likely.
return(-17); /* EEXIST */
}
finally
{
if (stream == null)
{
FileTable.ReleaseFD(fd);
}
}
// Assign the stream to the "fd" slot in the file
// descriptor table.
FileTable.SetFileDescriptor(fd, stream);
return(fd);
}
