int
rpl_dup2 (int fd, int desired_fd)
{
int result;
# 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
result = dup2 (fd, desired_fd);
/* Correct an errno value on FreeBSD 6.1 and Cygwin 1.5.x. */
if (result == -1 && errno == EMFILE)
errno = EBADF;
# if REPLACE_FCHDIR
if (fd != desired_fd && result != -1)
result = _gl_register_dup (fd, result);
# endif
return result;
}
int
rpl_dup (int fd)
{
int result = dup_nothrow (fd);
#if REPLACE_FCHDIR
if (result >= 0)
result = _gl_register_dup (fd, result);
#endif
return result;
}
int
rpl_dup (int oldfd)
#undef dup
{
int newfd = dup (oldfd);
if (0 <= newfd)
newfd = _gl_register_dup (oldfd, newfd);
return newfd;
}
int
rpl_dup2 (int fd, int desired_fd)
{
int result;
# if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
/* If fd is closed, mingw hangs on dup2 (fd, fd). If fd is open,
dup2 (fd, fd) returns 0, but all further attempts to use fd in
future dup2 calls will hang. */
if (fd == desired_fd)
{
if ((HANDLE) _get_osfhandle (fd) == INVALID_HANDLE_VALUE)
{
errno = EBADF;
return -1;
}
return fd;
}
/* Wine 1.0.1 return 0 when desired_fd is negative but not -1:
http://bugs.winehq.org/show_bug.cgi?id=21289 */
if (desired_fd < 0)
{
errno = EBADF;
return -1;
}
# elif !defined __linux__
/* On Haiku, dup2 (fd, fd) mistakenly clears FD_CLOEXEC. */
if (fd == desired_fd)
return fcntl (fd, F_GETFL) == -1 ? -1 : fd;
# endif
result = dup2_nothrow (fd, desired_fd);
# ifdef __linux__
/* Correct a Linux return value.
<http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.30.y.git;a=commitdiff;h=2b79bc4f7ebbd5af3c8b867968f9f15602d5f802>
*/
if (fd == desired_fd && result == (unsigned int) -EBADF)
{
errno = EBADF;
result = -1;
}
# endif
if (result == 0)
result = desired_fd;
/* Correct a cygwin 1.5.x errno value. */
else if (result == -1 && errno == EMFILE)
errno = EBADF;
# if REPLACE_FCHDIR
if (fd != desired_fd && result != -1)
result = _gl_register_dup (fd, result);
# endif
return result;
}
int
dup2 (int fd, int desired_fd)
{
int result = fcntl (fd, F_GETFL) < 0 ? -1 : fd;
if (result == -1 || fd == desired_fd)
return result;
close (desired_fd);
# ifdef F_DUPFD
result = fcntl (fd, F_DUPFD, desired_fd);
# if REPLACE_FCHDIR
if (0 <= result)
result = _gl_register_dup (fd, result);
# endif
# else
result = dupfd (fd, desired_fd);
# endif
if (result == -1 && (errno == EMFILE || errno == EINVAL))
errno = EBADF;
return result;
}
int
rpl_dup2 (int fd, int desired_fd)
{
int result;
# if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
/* If fd is closed, mingw hangs on dup2 (fd, fd). If fd is open,
dup2 (fd, fd) returns 0, but all further attempts to use fd in
future dup2 calls will hang. */
if (fd == desired_fd)
{
if ((HANDLE) _get_osfhandle (fd) == INVALID_HANDLE_VALUE)
{
errno = EBADF;
return -1;
}
return fd;
}
# endif
result = dup2 (fd, desired_fd);
# ifdef __linux__
/* Correct a Linux return value.
<http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.30.y.git;a=commitdiff;h=2b79bc4f7ebbd5af3c8b867968f9f15602d5f802>
*/
if (fd == desired_fd && result == (unsigned int) -EBADF)
{
errno = EBADF;
result = -1;
}
# endif
if (result == 0)
result = desired_fd;
/* Correct a cygwin 1.5.x errno value. */
else if (result == -1 && errno == EMFILE)
errno = EBADF;
# if REPLACE_FCHDIR
if (fd != desired_fd && result != -1)
result = _gl_register_dup (fd, result);
# endif
return result;
}
int
rpl_dup2 (int fd, int desired_fd)
{
int result;
# 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 Haiku, dup2 (fd, fd) mistakenly clears FD_CLOEXEC. */
if (fd == desired_fd)
return fcntl (fd, F_GETFL) == -1 ? -1 : fd;
# endif
result = dup2 (fd, desired_fd);
/* Correct an errno value on FreeBSD 6.1 and Cygwin 1.5.x. */
if (result == -1 && errno == EMFILE)
errno = EBADF;
# if REPLACE_FCHDIR
if (fd != desired_fd && result != -1)
result = _gl_register_dup (fd, result);
# endif
return result;
}
int
dup3 (int oldfd, int newfd, int flags)
{
#if HAVE_DUP3
# undef dup3
/* Try the system call first, if it exists. (We may be running with a glibc
that has the function but with an older kernel that lacks it.) */
{
/* Cache the information whether the system call really exists. */
static int have_dup3_really; /* 0 = unknown, 1 = yes, -1 = no */
if (have_dup3_really >= 0)
{
int result = dup3 (oldfd, newfd, flags);
if (!(result < 0 && errno == ENOSYS))
{
have_dup3_really = 1;
#if REPLACE_FCHDIR
if (0 <= result)
result = _gl_register_dup (oldfd, newfd);
#endif
return result;
}
have_dup3_really = -1;
}
}
#endif
if (newfd < 0 || newfd >= getdtablesize () || fcntl (oldfd, F_GETFD) == -1)
{
errno = EBADF;
return -1;
}
if (newfd == oldfd)
{
errno = EINVAL;
return -1;
}
/* Check the supported flags.
Note that O_NONBLOCK is not supported, because setting it on newfd
would implicitly also set it on oldfd. */
if ((flags & ~(O_CLOEXEC | O_BINARY | O_TEXT)) != 0)
{
errno = EINVAL;
return -1;
}
if (flags & O_CLOEXEC)
{
int result;
close (newfd);
result = fcntl (oldfd, F_DUPFD_CLOEXEC, newfd);
if (newfd < result)
{
close (result);
errno = EIO;
result = -1;
}
if (result < 0)
return -1;
}
else if (dup2 (oldfd, newfd) < 0)
return -1;
#if O_BINARY
if (flags & O_BINARY)
setmode (newfd, O_BINARY);
else if (flags & O_TEXT)
setmode (newfd, O_TEXT);
#endif
return newfd;
}
