Commits on Oct 6, 2023

1. Improve error printing in process_posix.rs …

   * The posix_spawn_* family of functions returns != 0 on error,
     and the return is an error code that can be passed to strerror().
     So check for `!= 0`, not `< 0`. (Error codes that can be passed
     to strerror() are in practice > 0!) Rename `check_posix` to
     `check_posix_spawn` too, to make it clear it's only for checking
     return codes from functions in the posix_spawn_* family.
   
   * The normal C runtime functions return a code < 0 on error, and
     put the error code in errno. Add a check_ret_errno function and
     call that instead of check_posix for non-spawn functions.

   

   nico committed Oct 6, 2023
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