diff options
Diffstat (limited to 'm4/fcntl.m4')
| -rw-r--r-- | m4/fcntl.m4 | 59 |
1 files changed, 45 insertions, 14 deletions
diff --git a/m4/fcntl.m4 b/m4/fcntl.m4 index 5481cae..bb61470 100644 --- a/m4/fcntl.m4 +++ b/m4/fcntl.m4 @@ -1,5 +1,5 @@ -# fcntl.m4 serial 5 -dnl Copyright (C) 2009-2013 Free Software Foundation, Inc. +# fcntl.m4 serial 9 +dnl Copyright (C) 2009-2016 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, dnl with or without modifications, as long as this notice is preserved. @@ -27,20 +27,51 @@ AC_DEFUN([gl_FUNC_FCNTL], dnl haiku alpha 2 F_DUPFD has wrong errno AC_CACHE_CHECK([whether fcntl handles F_DUPFD correctly], [gl_cv_func_fcntl_f_dupfd_works], - [AC_RUN_IFELSE([AC_LANG_PROGRAM([[ -#include <fcntl.h> -#include <errno.h> -]], [[int result = 0; - if (fcntl (0, F_DUPFD, -1) != -1) result |= 1; - if (errno != EINVAL) result |= 2; - return result; - ]])], + [AC_RUN_IFELSE( + [AC_LANG_PROGRAM( + [[#include <errno.h> + #include <fcntl.h> + #include <limits.h> + #include <sys/resource.h> + #include <unistd.h> + #ifndef RLIM_SAVED_CUR + # define RLIM_SAVED_CUR RLIM_INFINITY + #endif + #ifndef RLIM_SAVED_MAX + # define RLIM_SAVED_MAX RLIM_INFINITY + #endif + ]], + [[int result = 0; + int bad_fd = INT_MAX; + struct rlimit rlim; + if (getrlimit (RLIMIT_NOFILE, &rlim) == 0 + && 0 <= rlim.rlim_cur && rlim.rlim_cur <= INT_MAX + && rlim.rlim_cur != RLIM_INFINITY + && rlim.rlim_cur != RLIM_SAVED_MAX + && rlim.rlim_cur != RLIM_SAVED_CUR) + bad_fd = rlim.rlim_cur; + 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; + /* On OS/2 kLIBC, F_DUPFD does not work on a directory fd */ + { + int fd; + fd = open (".", O_RDONLY); + if (fd == -1) + result |= 16; + else if (fcntl (fd, F_DUPFD, STDERR_FILENO + 1) == -1) + result |= 32; + + close (fd); + } + return result;]])], [gl_cv_func_fcntl_f_dupfd_works=yes], [gl_cv_func_fcntl_f_dupfd_works=no], - [# Guess that it works on glibc systems - case $host_os in #(( - *-gnu*) gl_cv_func_fcntl_f_dupfd_works="guessing yes";; - *) gl_cv_func_fcntl_f_dupfd_works="guessing no";; + [case $host_os in + aix* | cygwin* | haiku*) + gl_cv_func_fcntl_f_dupfd_works="guessing no" ;; + *) gl_cv_func_fcntl_f_dupfd_works="guessing yes" ;; esac])]) case $gl_cv_func_fcntl_f_dupfd_works in *yes) ;; |