/* Duplicate an open file descriptor to a specified file descriptor.
- Copyright (C) 1999, 2004-2007, 2009-2012 Free Software Foundation, Inc.
+ Copyright (C) 1999, 2004-2007, 2009-2016 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
# define dup2 ms_windows_dup2
+# elif defined __KLIBC__
+
+# include <InnoTekLIBC/backend.h>
+
+static int
+klibc_dup2dirfd (int fd, int desired_fd)
+{
+ int tempfd;
+ int dupfd;
+
+ tempfd = open ("NUL", O_RDONLY);
+ if (tempfd == -1)
+ return -1;
+
+ if (tempfd == desired_fd)
+ {
+ close (tempfd);
+
+ char path[_MAX_PATH];
+ if (__libc_Back_ioFHToPath (fd, path, sizeof (path)))
+ return -1;
+
+ return open(path, O_RDONLY);
+ }
+
+ dupfd = klibc_dup2dirfd (fd, desired_fd);
+
+ close (tempfd);
+
+ return dupfd;
+}
+
+static int
+klibc_dup2 (int fd, int desired_fd)
+{
+ int dupfd;
+ struct stat sbuf;
+
+ dupfd = dup2 (fd, desired_fd);
+ if (dupfd == -1 && errno == ENOTSUP \
+ && !fstat (fd, &sbuf) && S_ISDIR (sbuf.st_mode))
+ {
+ close (desired_fd);
+
+ return klibc_dup2dirfd (fd, desired_fd);
+ }
+
+ return dupfd;
+}
+
+# define dup2 klibc_dup2
# endif
int
# ifdef F_GETFL
/* On Linux kernels 2.6.26-2.6.29, dup2 (fd, fd) returns -EBADF.
On Cygwin 1.5.x, dup2 (1, 1) returns 0.
+ On Cygwin 1.7.17, dup2 (1, -1) dumps core.
+ On Cygwin 1.7.25, dup2 (1, 256) can dump core.
On Haiku, dup2 (fd, fd) mistakenly clears FD_CLOEXEC. */
+# if HAVE_SETDTABLESIZE
+ setdtablesize (desired_fd + 1);
+# endif
+ if (desired_fd < 0)
+ fd = desired_fd;
if (fd == desired_fd)
return fcntl (fd, F_GETFL) == -1 ? -1 : fd;
# endif