[no subject]

[manor]

While building Swarm on Linux (Slackware) I built tcl7.5 and noticed an
interesting incompatibility between the two (at least on my Linux release):

Whereas in Slackware '96 <asm/errno.h> I found the following:

  #define EDEADLOCK       EDEADLK

in tcl7.5/generic/tclPosix.c this code was present:

  #if defined(EDEADLK) && (!defined(EWOULDBLOCK) || (EDEADLK != EWOULDBLOCK))
          case EDEADLK: return "EDEADLK";
  #endif
  #ifdef EDEADLOCK
          case EDEADLOCK: return "EDEADLOCK";
  #endif

As well the following similar lines:

  #if defined(EDEADLK) && (!defined(EWOULDBLOCK) || (EDEADLK != EWOULDBLOCK))
        case EDEADLK: return "resource deadlock avoided";
  #endif
  #ifdef EDEADLOCK
        case EDEADLOCK: return "resource deadlock avoided";
  #endif

Which cause a compilation error because the enclosing switch statement has
two cases with the same value (due to the #define in errno.h).

Now, what I'm wondering is this: who violated his/her contract? The author
of errno.h (for amalgamating two distinct error messages) or the author of
tclPosix.c (for assuming distinct values for all the error codes)?

Regards,

Manor.

PS. I found the following comments about the intended meaning of these two
    distinct error codes in the errno.h on my Irix machine:

   #define EDEADLK 45      /* Resource deadlock avoided            */
   #define EDEADLOCK 56    /* file locking deadlock error          */

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