diff options
Diffstat (limited to 'm4/dup2.m4')
| -rw-r--r-- | m4/dup2.m4 | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/m4/dup2.m4 b/m4/dup2.m4 index 89638a0bfe..6498fc2024 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" ;; |