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Annotation of embedaddon/rsync/m4/socklen_t.m4, revision 1.1

1.1     ! misho       1: dnl Check for socklen_t: historically on BSD it is an int, and in
        !             2: dnl POSIX 1g it is a type of its own, but some platforms use different
        !             3: dnl types for the argument to getsockopt, getpeername, etc.  So we
        !             4: dnl have to test to find something that will work.
        !             5: 
        !             6: dnl This is no good, because passing the wrong pointer on C compilers is
        !             7: dnl likely to only generate a warning, not an error.  We don't call this at
        !             8: dnl the moment.
        !             9: 
        !            10: AC_DEFUN([TYPE_SOCKLEN_T],
        !            11: [
        !            12:    AC_CHECK_TYPE([socklen_t], ,[
        !            13:       AC_MSG_CHECKING([for socklen_t equivalent])
        !            14:       AC_CACHE_VAL([rsync_cv_socklen_t_equiv],
        !            15:       [
        !            16:          # Systems have either "struct sockaddr *" or
        !            17:          # "void *" as the second argument to getpeername
        !            18:          rsync_cv_socklen_t_equiv=
        !            19:          for arg2 in "struct sockaddr" void; do
        !            20:             for t in int size_t unsigned long "unsigned long"; do
        !            21:                AC_TRY_COMPILE([
        !            22: #include <sys/types.h>
        !            23: #include <sys/socket.h>
        !            24: 
        !            25:                   int getpeername (int, $arg2 *, $t *);
        !            26:                ],[
        !            27:                   $t len;
        !            28:                   getpeername(0,0,&len);
        !            29:                ],[
        !            30:                   rsync_cv_socklen_t_equiv="$t"
        !            31:                   break
        !            32:                ])
        !            33:             done
        !            34:          done
        !            35: 
        !            36:          if test "x$rsync_cv_socklen_t_equiv" = x; then
        !            37:             AC_MSG_ERROR([Cannot find a type to use in place of socklen_t])
        !            38:          fi
        !            39:       ])
        !            40:       AC_MSG_RESULT($rsync_cv_socklen_t_equiv)
        !            41:       AC_DEFINE_UNQUOTED(socklen_t, $rsync_cv_socklen_t_equiv,
        !            42:                        [type to use in place of socklen_t if not defined])],
        !            43:       [#include <sys/types.h>
        !            44: #include <sys/socket.h>])
        !            45: ])