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Annotation of OpenXM_contrib/gnuplot/m4/select.m4, Revision 1.1

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