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Annotation of OpenXM_contrib/gnuplot/m4/select.m4, Revision 1.1.1.2

1.1       maekawa     1: dnl testing new version of FUNC_SELECT
                      2:
                      3: AC_DEFUN(AC_FUNC_SELECT,
                      4: [AC_CHECK_FUNCS(select)
                      5: if test "$ac_cv_func_select" = yes; then
                      6:   AC_CHECK_HEADERS(unistd.h sys/types.h sys/time.h sys/select.h sys/socket.h)
                      7:   AC_MSG_CHECKING([argument types of select()])
1.1.1.2 ! ohara       8:   AC_CACHE_VAL(ac_cv_type_fd_set_size_t,
        !             9:     [AC_CACHE_VAL(ac_cv_type_fd_set,
1.1       maekawa    10:       [for ac_cv_type_fd_set in 'fd_set' 'int' 'void'; do
                     11:         for ac_cv_type_fd_set_size_t in 'int' 'size_t' 'unsigned long' 'unsigned'; do
                     12:          for ac_type_timeval in 'struct timeval' 'const struct timeval'; do
1.1.1.2 ! ohara      13:             AC_TRY_COMPILE(
1.1       maekawa    14: [#ifdef HAVE_SYS_TIME_H
1.1.1.2 ! ohara      15: # include <sys/time.h>
1.1       maekawa    16: #endif
                     17: #ifdef HAVE_SYS_TYPES_H
1.1.1.2 ! ohara      18: # include <sys/types.h>
1.1       maekawa    19: #endif
                     20: #ifdef HAVE_UNISTD_H
1.1.1.2 ! ohara      21: # include <unistd.h>
1.1       maekawa    22: #endif
                     23: #ifdef HAVE_SYS_SELECT_H
1.1.1.2 ! ohara      24: # include <sys/select.h>
1.1       maekawa    25: #endif
                     26: #ifdef HAVE_SYS_SOCKET_H
1.1.1.2 ! ohara      27: # include <sys/socket.h>
        !            28: #endif
        !            29: ],
1.1       maekawa    30: [#ifdef __STDC__
                     31: extern int select ($ac_cv_type_fd_set_size_t,
                     32:  $ac_cv_type_fd_set *, $ac_cv_type_fd_set *, $ac_cv_type_fd_set *,
                     33:  $ac_type_timeval *);
                     34: #else
                     35: extern int select ();
                     36:   $ac_cv_type_fd_set_size_t s;
                     37:   $ac_cv_type_fd_set *p;
                     38:   $ac_type_timeval *t;
1.1.1.2 ! ohara      39: #endif
        !            40: ],
1.1       maekawa    41: [ac_found=yes ; break 3],ac_found=no)
                     42:           done
                     43:         done
                     44:       done
                     45:     ])dnl AC_CACHE_VAL
                     46:   ])dnl AC_CACHE_VAL
                     47:   if test "$ac_found" = no; then
                     48:     AC_MSG_ERROR([can't determine argument types])
                     49:   fi
                     50:
                     51:   AC_MSG_RESULT([select($ac_cv_type_fd_set_size_t,$ac_cv_type_fd_set *,...)])
                     52:   AC_DEFINE_UNQUOTED(fd_set_size_t, $ac_cv_type_fd_set_size_t,
1.1.1.2 ! ohara      53:                      [ First arg for select. ])
1.1       maekawa    54:   ac_cast=
                     55:   if test "$ac_cv_type_fd_set" != fd_set; then
                     56:     # Arguments 2-4 are not fd_set.  Some weirdo systems use fd_set type for
                     57:     # FD_SET macros, but insist that you cast the argument to select.  I don't
                     58:     # understand why that might be, but it means we cannot define fd_set.
1.1.1.2 ! ohara      59:     AC_EGREP_CPP(
1.1       maekawa    60: changequote(<<,>>)dnl
                     61: <<(^|[^a-zA-Z_0-9])fd_set[^a-zA-Z_0-9]>>dnl
                     62: changequote([,]),dnl
                     63: [#ifdef HAVE_SYS_TIME_H
1.1.1.2 ! ohara      64: # include <sys/time.h>
1.1       maekawa    65: #endif
                     66: #ifdef HAVE_SYS_TYPES_H
1.1.1.2 ! ohara      67: # include <sys/types.h>
1.1       maekawa    68: #endif
                     69: #ifdef HAVE_UNISTD_H
1.1.1.2 ! ohara      70: # include <unistd.h>
1.1       maekawa    71: #endif
                     72: #ifdef HAVE_SYS_SELECT_H
1.1.1.2 ! ohara      73: # include <sys/select.h>
1.1       maekawa    74: #endif
                     75: #ifdef HAVE_SYS_SOCKET_H
1.1.1.2 ! ohara      76: # include <sys/socket.h>
        !            77: #endif
        !            78: ],
1.1       maekawa    79:     # We found fd_set type in a header, need special cast
                     80:     ac_cast="($ac_cv_type_fd_set *)",dnl
                     81:     # No fd_set type; it is safe to define it
                     82:     AC_DEFINE_UNQUOTED(fd_set,$ac_cv_type_fd_set,
1.1.1.2 ! ohara      83:                        [ Define if the type in arguments 2-4 to select is fd_set. ]))
1.1       maekawa    84:   fi
                     85:   AC_DEFINE_UNQUOTED(SELECT_FD_SET_CAST,$ac_cast,
1.1.1.2 ! ohara      86:                      [ Define if the type in arguments 2-4 to select is fd_set. ])
1.1       maekawa    87: fi
                     88: ])
                     89: