diff options
Diffstat (limited to 'infrastructure/m4/ax_func_syscall.m4')
| -rw-r--r-- | infrastructure/m4/ax_func_syscall.m4 | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/infrastructure/m4/ax_func_syscall.m4 b/infrastructure/m4/ax_func_syscall.m4 new file mode 100644 index 00000000..40496bf0 --- /dev/null +++ b/infrastructure/m4/ax_func_syscall.m4 @@ -0,0 +1,39 @@ +dnl @synopsis AX_FUNC_SYSCALL +dnl +dnl This macro will find out how to call syscall. One or more of the following +dnl defines will be made as appropriate: +dnl HAVE_UNISTD_H - If unistd.h is available +dnl HAVE_SYS_SYSCALL_H - If sys/syscall.h is available +dnl HAVE_SYSCALL - If syscall() is available and is defined in unistd.h +dnl HAVE___SYSCALL - If __syscall() is available and is defined in unistd.h +dnl HAVE___SYSCALL_NEED_DEFN - If __syscall() is available but is not defined in unistd.h +dnl +dnl @category C +dnl @author Martin Ebourne +dnl @version 2005/07/01 +dnl @license AllPermissive + +AC_DEFUN([AX_FUNC_SYSCALL], [ + AC_CHECK_HEADERS([sys/syscall.h unistd.h]) + AC_CHECK_FUNCS([syscall __syscall]) + if test "x$ac_cv_func_syscall" != "xyes" && + test "x$ac_cv_func___syscall" != "xyes"; then + AC_CACHE_CHECK([for __syscall needing definition], [have___syscall_need_defn], + [AC_RUN_IFELSE([AC_LANG_PROGRAM([[ + $ac_includes_default + #ifdef HAVE_SYS_SYSCALL_H + #include <sys/syscall.h> + #endif + extern "C" off_t __syscall(quad_t number, ...); + ]], [[ + __syscall(SYS_exit, 0); + return 1; + ]])], + [have___syscall_need_defn=yes], [have___syscall_need_defn=no] + )]) + if test "x$have___syscall_need_defn" = "xyes"; then + AC_DEFINE([HAVE___SYSCALL_NEED_DEFN], 1, + [Define to 1 if __syscall is available but needs a definition]) + fi + fi + ])dnl |