Commit 638e3c07 authored by Yang Tse's avatar Yang Tse
Browse files

improve detection of gethostname()

parent 07aeac37

ares/configure.ac

+1 −0
Original line number Diff line number Diff line
@@ -645,6 +645,7 @@ CURL_CHECK_FUNC_RECVFROM 
CURL_CHECK_FUNC_SEND

CURL_CHECK_MSG_NOSIGNAL



CARES_CHECK_FUNC_GETHOSTNAME

CARES_CHECK_FUNC_STRCASECMP

CARES_CHECK_FUNC_STRCMPI

CARES_CHECK_FUNC_STRDUP

ares/m4/cares-functions.m4

+106 −0
Original line number Diff line number Diff line
@@ -64,6 +64,112 @@ cares_includes_sys_uio="\ 
])





dnl CARES_INCLUDES_UNISTD

dnl -------------------------------------------------

dnl Set up variable with list of headers that must be

dnl included when unistd.h is to be included.



AC_DEFUN([CARES_INCLUDES_UNISTD], [

cares_includes_unistd="\

/* includes start */

#ifdef HAVE_SYS_TYPES_H

#  include <sys/types.h>

#endif

#ifdef HAVE_UNISTD_H

#  include <unistd.h>

#endif

/* includes end */"

  AC_CHECK_HEADERS(

    sys/types.h unistd.h,

    [], [], [$cares_includes_unistd])

])





dnl CARES_CHECK_FUNC_GETHOSTNAME

dnl -------------------------------------------------

dnl Verify if gethostname is available, prototyped, and

dnl can be compiled. If all of these are true, and

dnl usage has not been previously disallowed with

dnl shell variable cares_disallow_gethostname, then

dnl HAVE_GETHOSTNAME will be defined.



AC_DEFUN([CARES_CHECK_FUNC_GETHOSTNAME], [

  AC_REQUIRE([CARES_INCLUDES_UNISTD])dnl

  #

  tst_links_gethostname="unknown"

  tst_proto_gethostname="unknown"

  tst_compi_gethostname="unknown"

  tst_allow_gethostname="unknown"

  #

  AC_MSG_CHECKING([if gethostname can be linked])

  AC_LINK_IFELSE([

    AC_LANG_FUNC_LINK_TRY([gethostname])

  ],[

    AC_MSG_RESULT([yes])

    tst_links_gethostname="yes"

  ],[

    AC_MSG_RESULT([no])

    tst_links_gethostname="no"

  ])

  #

  if test "$tst_links_gethostname" = "yes"; then

    AC_MSG_CHECKING([if gethostname is prototyped])

    AC_EGREP_CPP([gethostname],[

      $cares_includes_unistd

    ],[

      AC_MSG_RESULT([yes])

      tst_proto_gethostname="yes"

    ],[

      AC_MSG_RESULT([no])

      tst_proto_gethostname="no"

    ])

  fi

  #

  if test "$tst_proto_gethostname" = "yes"; then

    AC_MSG_CHECKING([if gethostname is compilable])

    AC_COMPILE_IFELSE([

      AC_LANG_PROGRAM([[

        $cares_includes_unistd

      ]],[[

        if(0 != gethostname(0, 0))

          return 1;

      ]])

    ],[

      AC_MSG_RESULT([yes])

      tst_compi_gethostname="yes"

    ],[

      AC_MSG_RESULT([no])

      tst_compi_gethostname="no"

    ])

  fi

  #

  if test "$tst_compi_gethostname" = "yes"; then

    AC_MSG_CHECKING([if gethostname usage allowed])

    if test "x$cares_disallow_gethostname" != "xyes"; then

      AC_MSG_RESULT([yes])

      tst_allow_gethostname="yes"

    else

      AC_MSG_RESULT([no])

      tst_allow_gethostname="no"

    fi

  fi

  #

  AC_MSG_CHECKING([if gethostname might be used])

  if test "$tst_links_gethostname" = "yes" &&

     test "$tst_proto_gethostname" = "yes" &&

     test "$tst_compi_gethostname" = "yes" &&

     test "$tst_allow_gethostname" = "yes"; then

    AC_MSG_RESULT([yes])

    AC_DEFINE_UNQUOTED(HAVE_GETHOSTNAME, 1,

      [Define to 1 if you have the gethostname function.])

    ac_cv_func_gethostname="yes"

  else

    AC_MSG_RESULT([no])

    ac_cv_func_gethostname="no"

  fi

])





dnl CARES_CHECK_FUNC_STRCASECMP

dnl -------------------------------------------------

dnl Verify if strcasecmp is available, prototyped, and