diff options
Diffstat (limited to 'm4')
| -rw-r--r-- | m4/dup2.m4 | 12 | ||||
| -rw-r--r-- | m4/fcntl.m4 | 12 |
2 files changed, 21 insertions, 3 deletions
diff --git a/m4/dup2.m4 b/m4/dup2.m4 index 89638a0bfe3..6498fc20245 100644 --- a/m4/dup2.m4 +++ b/m4/dup2.m4 @@ -8,6 +8,7 @@ AC_DEFUN([gl_FUNC_DUP2], [ AC_REQUIRE([gl_UNISTD_H_DEFAULTS]) AC_REQUIRE([AC_CANONICAL_HOST]) + AC_CHECK_FUNCS_ONCE([getdtablesize]) m4_ifdef([gl_FUNC_DUP2_OBSOLETE], [ AC_CHECK_FUNCS_ONCE([dup2]) if test $ac_cv_func_dup2 = no; then @@ -23,6 +24,11 @@ AC_DEFUN([gl_FUNC_DUP2], #include <fcntl.h> #include <errno.h>]], [int result = 0; +#ifdef HAVE_GETDTABLESIZE + int bad_fd = getdtablesize (); +#else + int bad_fd = 1000000; +#endif #ifdef FD_CLOEXEC if (fcntl (1, F_SETFD, FD_CLOEXEC) == -1) result |= 1; @@ -37,7 +43,7 @@ AC_DEFUN([gl_FUNC_DUP2], if (dup2 (0, 0) != -1) result |= 8; /* Many gnulib modules require POSIX conformance of EBADF. */ - if (dup2 (2, 1000000) == -1 && errno != EBADF) + if (dup2 (2, bad_fd) == -1 && errno != EBADF) result |= 16; /* Flush out some cygwin core dumps. */ if (dup2 (2, -1) != -1 || errno != EBADF) @@ -56,7 +62,9 @@ AC_DEFUN([gl_FUNC_DUP2], linux*) # On linux between 2008-07-27 and 2009-05-11, dup2 of a # closed fd may yield -EBADF instead of -1 / errno=EBADF. gl_cv_func_dup2_works="guessing no" ;; - freebsd*) # on FreeBSD 6.1, dup2(1,1000000) gives EMFILE, not EBADF. + aix* | freebsd*) + # on AIX 7.1 and FreeBSD 6.1, dup2 (1,toobig) gives EMFILE, + # not EBADF. gl_cv_func_dup2_works="guessing no" ;; haiku*) # on Haiku alpha 2, dup2(1, 1) resets FD_CLOEXEC. gl_cv_func_dup2_works="guessing no" ;; diff --git a/m4/fcntl.m4 b/m4/fcntl.m4 index 4a2771fae35..f824beb6597 100644 --- a/m4/fcntl.m4 +++ b/m4/fcntl.m4 @@ -19,7 +19,7 @@ AC_DEFUN([gl_FUNC_FCNTL], AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) AC_REQUIRE([gl_FCNTL_H_DEFAULTS]) AC_REQUIRE([AC_CANONICAL_HOST]) - AC_CHECK_FUNCS_ONCE([fcntl]) + AC_CHECK_FUNCS_ONCE([fcntl getdtablesize]) if test $ac_cv_func_fcntl = no; then gl_REPLACE_FCNTL else @@ -28,11 +28,21 @@ AC_DEFUN([gl_FUNC_FCNTL], AC_CACHE_CHECK([whether fcntl handles F_DUPFD correctly], [gl_cv_func_fcntl_f_dupfd_works], [AC_RUN_IFELSE([AC_LANG_PROGRAM([[ +#ifdef HAVE_GETDTABLESIZE +# include <unistd.h> +#endif #include <fcntl.h> #include <errno.h> ]], [[int result = 0; +#ifdef HAVE_GETDTABLESIZE + int bad_fd = getdtablesize (); +#else + int bad_fd = 1000000; +#endif if (fcntl (0, F_DUPFD, -1) != -1) result |= 1; if (errno != EINVAL) result |= 2; + if (fcntl (0, F_DUPFD, bad_fd) != -1) result |= 4; + if (errno != EINVAL) result |= 8; return result; ]])], [gl_cv_func_fcntl_f_dupfd_works=yes], |