diff options
Diffstat (limited to 'src/gl/m4/dup2.m4')
| -rw-r--r-- | src/gl/m4/dup2.m4 | 117 |
1 files changed, 0 insertions, 117 deletions
diff --git a/src/gl/m4/dup2.m4 b/src/gl/m4/dup2.m4 deleted file mode 100644 index 5b68312b1e..0000000000 --- a/src/gl/m4/dup2.m4 +++ /dev/null @@ -1,117 +0,0 @@ -#serial 25 -dnl Copyright (C) 2002, 2005, 2007, 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. - -AC_DEFUN([gl_FUNC_DUP2], -[ - AC_REQUIRE([gl_UNISTD_H_DEFAULTS]) - AC_REQUIRE([AC_CANONICAL_HOST]) - m4_ifdef([gl_FUNC_DUP2_OBSOLETE], [ - AC_CHECK_FUNCS_ONCE([dup2]) - if test $ac_cv_func_dup2 = no; then - HAVE_DUP2=0 - fi - ], [ - AC_DEFINE([HAVE_DUP2], [1], [Define to 1 if you have the 'dup2' function.]) - ]) - if test $HAVE_DUP2 = 1; then - AC_CACHE_CHECK([whether dup2 works], [gl_cv_func_dup2_works], - [AC_RUN_IFELSE([ - AC_LANG_PROGRAM( - [[#include <errno.h> - #include <fcntl.h> - #include <limits.h> - #include <sys/resource.h> - #include <unistd.h> - #ifndef RLIM_SAVED_CUR - # define RLIM_SAVED_CUR RLIM_INFINITY - #endif - #ifndef RLIM_SAVED_MAX - # define RLIM_SAVED_MAX RLIM_INFINITY - #endif - ]], - [[int result = 0; - int bad_fd = INT_MAX; - struct rlimit rlim; - if (getrlimit (RLIMIT_NOFILE, &rlim) == 0 - && 0 <= rlim.rlim_cur && rlim.rlim_cur <= INT_MAX - && rlim.rlim_cur != RLIM_INFINITY - && rlim.rlim_cur != RLIM_SAVED_MAX - && rlim.rlim_cur != RLIM_SAVED_CUR) - bad_fd = rlim.rlim_cur; - #ifdef FD_CLOEXEC - if (fcntl (1, F_SETFD, FD_CLOEXEC) == -1) - result |= 1; - #endif - if (dup2 (1, 1) != 1) - result |= 2; - #ifdef FD_CLOEXEC - if (fcntl (1, F_GETFD) != FD_CLOEXEC) - result |= 4; - #endif - close (0); - if (dup2 (0, 0) != -1) - result |= 8; - /* Many gnulib modules require POSIX conformance of EBADF. */ - if (dup2 (2, bad_fd) == -1 && errno != EBADF) - result |= 16; - /* Flush out some cygwin core dumps. */ - if (dup2 (2, -1) != -1 || errno != EBADF) - result |= 32; - dup2 (2, 255); - dup2 (2, 256); - /* On OS/2 kLIBC, dup2() does not work on a directory fd. */ - { - int fd = open (".", O_RDONLY); - if (fd == -1) - result |= 64; - else if (dup2 (fd, fd + 1) == -1) - result |= 128; - - close (fd); - } - return result;]]) - ], - [gl_cv_func_dup2_works=yes], [gl_cv_func_dup2_works=no], - [case "$host_os" in - mingw*) # on this platform, dup2 always returns 0 for success - gl_cv_func_dup2_works="guessing no" ;; - cygwin*) # on cygwin 1.5.x, dup2(1,1) returns 0 - gl_cv_func_dup2_works="guessing no" ;; - 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" ;; - *-android*) # implemented using dup3(), which fails if oldfd == newfd - gl_cv_func_dup2_works="guessing no" ;; - os2*) # on OS/2 kLIBC, dup2() does not work on a directory fd. - gl_cv_func_dup2_works="guessing no" ;; - *) gl_cv_func_dup2_works="guessing yes" ;; - esac]) - ]) - case "$gl_cv_func_dup2_works" in - *yes) ;; - *) - REPLACE_DUP2=1 - AC_CHECK_FUNCS([setdtablesize]) - ;; - esac - fi - dnl Replace dup2() for supporting the gnulib-defined fchdir() function, - dnl to keep fchdir's bookkeeping up-to-date. - m4_ifdef([gl_FUNC_FCHDIR], [ - gl_TEST_FCHDIR - if test $HAVE_FCHDIR = 0; then - if test $HAVE_DUP2 = 1; then - REPLACE_DUP2=1 - fi - fi - ]) -]) - -# Prerequisites of lib/dup2.c. -AC_DEFUN([gl_PREREQ_DUP2], []) |