[Bug libc/18433] posix_spawn does not return correctly upon failure to execute

["rahimi.nv at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=18433

--- Comment #4 from navid R <rahimi.nv at gmail dot com> ---
I developed a pipe solution but didn't get accepted . the problem raise because
glibc is supporting system without pipe2 , (we can use pipe for creating file
descriptor and  use fcntl and FD_CLOEXEC to set it proper flag , but there is
race condition between two calls . and the overall code is so messy .


#ifdef __ASSUME_PIPE2
  if (__pipe2 (pipefd, O_CLOEXEC))
    return errno; 
#else
  if (__pipe (pipefd))
    return errno; 
  if (__fcntl (pipefd[0], FD_CLOEXEC) == -1 ||
 __fcntl (pipefd[1], FD_CLOEXEC) == -1
    return errno;

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