Macro: ac_func_accept_argtypes

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# ac_func_accept_argtypes

## Synopsis

`AC_FUNC_ACCEPT_ARGTYPES`

## Version

1.1.1.1 (2001/07/26) Miscellaneous @ ac-archive-0.5.32

## Author

Daniel Richard G. <skunk@mit.edu>

## Description

Checks the data types of the three arguments to accept(). Results are placed into the symbols ACCEPT_TYPE_ARG[123], consistent with the following example:

`#define ACCEPT_TYPE_ARG1 int`
`#define ACCEPT_TYPE_ARG2 struct sockaddr *`
`#define ACCEPT_TYPE_ARG3 socklen_t *`

This macro requires AC_CHECK_HEADERS to have already verified the presence or absence of sys/types.h and sys/socket.h.

NOTE: This is just a modified version of the AC_FUNC_SELECT_ARGTYPES macro. Credit for that one goes to David MacKenzie et. al.

## M4 Source Code

    AC_DEFUN([AC_FUNC_ACCEPT_ARGTYPES],
    [AC_MSG_CHECKING([types of arguments for accept()])
     AC_CACHE_VAL(ac_cv_func_accept_arg1,dnl
     [AC_CACHE_VAL(ac_cv_func_accept_arg2,dnl
      [AC_CACHE_VAL(ac_cv_func_accept_arg3,dnl
       [for ac_cv_func_accept_arg1 in 'int' 'unsigned int'; do
         for ac_cv_func_accept_arg2 in 'struct sockaddr *' 'void *'; do
          for ac_cv_func_accept_arg3 in 'socklen_t *' 'size_t *' 'unsigned int *' 'int *'; do
           AC_TRY_COMPILE(dnl
    [#ifdef HAVE_SYS_TYPES_H
    #include <sys/types.h>
    #endif
    #ifdef HAVE_SYS_SOCKET_H
    #include <sys/socket.h>
    #endif
    extern accept ($ac_cv_func_accept_arg1, $ac_cv_func_accept_arg2, $ac_cv_func_accept_arg3);],,dnl
            [ac_not_found=no ; break 3], ac_not_found=yes)
          done
         done
        done
       ])dnl AC_CACHE_VAL
      ])dnl AC_CACHE_VAL
     ])dnl AC_CACHE_VAL
     if test "$ac_not_found" = yes; then
      ac_cv_func_accept_arg1=int
      ac_cv_func_accept_arg2='struct sockaddr *'
      ac_cv_func_accept_arg3='socklen_t *'
     fi
     AC_MSG_RESULT([$ac_cv_func_accept_arg1, $ac_cv_func_accept_arg2, $ac_cv_func_accept_arg3])
     AC_DEFINE_UNQUOTED(ACCEPT_TYPE_ARG1,$ac_cv_func_accept_arg1)
     AC_DEFINE_UNQUOTED(ACCEPT_TYPE_ARG2,$ac_cv_func_accept_arg2)
     AC_DEFINE_UNQUOTED(ACCEPT_TYPE_ARG3,$ac_cv_func_accept_arg3)
    ])