PE>
  > I know it's missing fork(), so it can't be too good at posix.
PE>

  For portability, I always recommend spawn*() over fork().

  Why ?

  Because fork() is expensive to implement on operating systems that use
  the "spawn" model (this includes almost all of them, from PC-DOS
  through OS/2 to several mainframe operating systems), whereas
  implementing spawn*() over fork/exec for operating systems that use
  the "fork" model (UNIX, essentially) as a library is relatively
  trivial and inexpensive.

  Almost all uses of fork() are part of a fork/exec sequence, which is
  merely spawn() in disguise anyway.

  The exceptions are system utilities that manipulate the user or group
  ID, which are usually non-portable anyway (most of the PC operating
  systems apply user IDs to the entire machine instead of to individual
  processes), and server processes that fork off copies of themselves to
  do work, which is a situation crying out for proper use of threads.

  > JdeBP <
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