Limit type

[Peter Stephenson <pws@ifh.de>]

On Irix, the type returned by limits is unsigned long, whereas zsh
assumes it is long.  Here, this is in particular a problem for filesize,
which comes out as 0 instead of 4095MB.

This fix is only partial.  It makes configure look for a definition of
rlim_t where it found the RLIMIT macros (and for good measure in
/usr/include/sys/resource.h in case they're different) and uses that.
The value printed is now correct.  (The division by 1M rather luckily
means not having to worry about the presence or absence of a sign bit.)

Unfortunately, this isn't the end of the matter, since zsh really
needs to know more specifically about the types when it is converting
from and to a string.  This would require configure to decide on a
particular type and define an appropriate macro (such as the existing
RLIM_T_IS_QUAD_T which after the patch is still defined ad hoc in
system.h).  I haven't had the strength to do this at the moment.  I
think the thing to do is alter zstrtoq() in utils.c to zstrtorlim_t(),
with appropriate definitions, and define and use it whenever RLIM_T is
not long.

Maybe somebody has cleverer ideas.

*** Src/system.h.rlt	Fri Jan  3 16:25:18 1997
--- Src/system.h	Fri Jan  3 17:07:46 1997
***************
*** 378,393 ****
  #endif
  
  /* RLIM_T is the type for system calls involving resource limits     */
! /* Eventually the following will be replaced by a check in configure */
  
  #if defined(BSD4_4) && (BSD > 199300)
  # define RLIM_T_IS_QUAD_T
  #endif
  
! #ifdef RLIM_T_IS_QUAD_T
! # define RLIM_T quad_t
  #else
! # define RLIM_T long
  #endif
  
  /* DIGBUFSIZ is the length of a buffer which can hold the -LONG_MAX-1 *
--- 378,399 ----
  #endif
  
  /* RLIM_T is the type for system calls involving resource limits     */
! /* The configure tests need improving to handle quad and unsigned better */
  
  #if defined(BSD4_4) && (BSD > 199300)
  # define RLIM_T_IS_QUAD_T
  #endif
  
! #ifdef HAVE_RLIM_T
! # define RLIM_T rlim_t
  #else
! 
! # ifdef RLIM_T_IS_QUAD_T
! #  define RLIM_T quad_t
! # else
! #  define RLIM_T long
! # endif
! 
  #endif
  
  /* DIGBUFSIZ is the length of a buffer which can hold the -LONG_MAX-1 *
*** acconfig.h.rlt	Fri Jan  3 16:41:17 1997
--- acconfig.h	Fri Jan  3 16:45:31 1997
***************
*** 165,169 ****
--- 165,172 ----
  /* Define to 1 if system has working FIFO's */
  #undef HAVE_FIFOS
  
+ /* Define to 1 if there is an rlim_t type */
+ #undef HAVE_RLIM_T
+ 
  /* Define to 1 if /bin/sh does not interpret \ escape sequences */
  #undef SH_USE_BSD_ECHO
*** config.h.in.rlt	Fri Jan  3 16:47:06 1997
--- config.h.in	Fri Jan  3 16:47:29 1997
***************
*** 207,212 ****
--- 207,215 ----
  /* Define to 1 if system has working FIFO's */
  #undef HAVE_FIFOS
  
+ /* Define to 1 if there is an rlim_t type */
+ #undef HAVE_RLIM_T
+ 
  /* Define to 1 if /bin/sh does not interpret \ escape sequences */
  #undef SH_USE_BSD_ECHO
  
*** configure.in.rlt	Fri Jan  3 16:28:25 1997
--- configure.in	Fri Jan  3 16:51:21 1997
***************
*** 520,525 ****
--- 520,543 ----
  AC_SUBST(RLIMITS_SRC_H)dnl
  AC_SUBST(RLIMITS_INC_H)dnl
  
+ dnl ---------------------------------------
+ dnl See if the file found defines an rlim_t
+ dnl ---------------------------------------
+ dnl In case we found the macros somewhere other than <sys/resource.h>,
+ dnl look through that as well.  No idea if this is necessary.
+ AC_CACHE_CHECK(if the rlim_t type is defined,zsh_cv_have_rlim_t,
+ [resource_file=$zsh_cv_path_rlimit_h
+ test -f /usr/sys/include/resource.h && \
+ resource_file="$resource_file /usr/sys/include/resource.h"
+ if grep '\<typedef\>.*\<rlim_t\>' $resource_file > /dev/null; then
+   zsh_cv_have_rlim_t=yes
+ else
+   zsh_cv_have_rlim_t=no
+ fi])
+ if test $zsh_cv_have_rlim_t = yes; then
+   AC_DEFINE(HAVE_RLIM_T)
+ fi
+ 
  dnl ----------------------------
  dnl CHECK FOR /dev/fd FILESYSTEM
  dnl ----------------------------

-- 
Peter Stephenson <pws@ifh.de>       Tel: +49 33762 77366
WWW:  http://www.ifh.de/~pws/       Fax: +49 33762 77413
Deutsches Elektronen-Synchrotron --- Institut fuer Hochenergiephysik Zeuthen
DESY-IfH, 15735 Zeuthen, Germany.