文件操作 - ax_sysv_ipc.m4
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文件: /usr/share/aclocal/ax_sysv_ipc.m4
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# =========================================================================== # https://www.gnu.org/software/autoconf-archive/ax_sysv_ipc.html # =========================================================================== # # SYNOPSIS # # AX_SYSV_IPC # # DESCRIPTION # # This macro checks for the SysV IPC header files. It only checks that you # can compile a program with them, not whether the system actually # implements working SysV IPC. # # 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_SYSV_IPC], [AX_SYSV_IPC]) AC_DEFUN([AX_SYSV_IPC], [ AC_CACHE_CHECK([for System V IPC headers], ac_cv_sysv_ipc, [ AC_TRY_COMPILE( [ #include <sys/types.h> #include <sys/ipc.h> #include <sys/msg.h> #include <sys/sem.h> #include <sys/shm.h> ],, ac_cv_sysv_ipc=yes, ac_cv_sysv_ipc=no) ]) if test x"$ac_cv_sysv_ipc" = "xyes" then AC_DEFINE(HAVE_SYSV_IPC, 1, [ Define if you have System V IPC ]) fi ]) dnl AX_SYSV_IPC
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