文件操作 - ax_struct_semun.m4
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文件: /usr/share/aclocal/ax_struct_semun.m4
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# =========================================================================== # https://www.gnu.org/software/autoconf-archive/ax_struct_semun.html # =========================================================================== # # SYNOPSIS # # AX_STRUCT_SEMUN # # DESCRIPTION # # This macro checks to see if sys/sem.h defines struct semun. Some systems # do, some systems don't. Your code must be able to deal with this # possibility; if HAVE_STRUCT_SEMUM isn't defined for a given system, you # have to define this structure before you can call functions like # semctl(). # # You should call AX_SYSV_IPC before this macro, to separate the check for # System V IPC headers from the check for struct semun. # # LICENSE # # Copyright (c) 2008 Warren Young <warren@etr-usa.com> # # Copying and distribution of this file, with or without modification, are # permitted in any medium without royalty provided the copyright notice # and this notice are preserved. This file is offered as-is, without any # warranty. #serial 8 AU_ALIAS([ETR_STRUCT_SEMUN], [AX_STRUCT_SEMUN]) AC_DEFUN([AX_STRUCT_SEMUN], [ AC_CACHE_CHECK([for struct semun], ac_cv_struct_semun, [ AC_TRY_COMPILE( [ #include <sys/types.h> #include <sys/ipc.h> #include <sys/sem.h> ], [ struct semun s; ], ac_cv_struct_semun=yes, ac_cv_struct_semun=no) ]) if test x"$ac_cv_struct_semun" = "xyes" then AC_DEFINE(HAVE_STRUCT_SEMUN, 1, [ Define if your system's sys/sem.h file defines struct semun ]) fi ]) dnl AX_STRUCT_SEMUN
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