#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
/* Native Woe32 API. */
+# include <string.h>
+
/* Get declarations of the Win32 API functions. */
# define WIN32_LEAN_AND_MEAN
# include <windows.h>
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 (oldfd < 0 || newfd < 0 || newfd >= getdtablesize ())
{
errno = EBADF;
if (flags & O_CLOEXEC)
{
/* Neither dup() nor dup2() can create a file descriptor with
- O_CLOEXEC = O_NOINHERIT set. We need to use the low-level function
- _open_osfhandle for this. Iterate until all file descriptors less
- than newfd are filled up. */
+ O_CLOEXEC = O_NOINHERIT set. We need to use the low-level function
+ _open_osfhandle for this. Iterate until all file descriptors less
+ than newfd are filled up. */
HANDLE curr_process = GetCurrentProcess ();
HANDLE old_handle = (HANDLE) _get_osfhandle (oldfd);
unsigned char fds_to_close[OPEN_MAX_MAX / CHAR_BIT];
int result;
if (old_handle == INVALID_HANDLE_VALUE)
- {
- /* oldfd is not open, or is an unassigned standard file
- descriptor. */
- errno = EBADF;
- return -1;
- }
+ {
+ /* oldfd is not open, or is an unassigned standard file
+ descriptor. */
+ errno = EBADF;
+ return -1;
+ }
close (newfd);
for (;;)
- {
- HANDLE new_handle;
- int duplicated_fd;
- unsigned int index;
-
- if (!DuplicateHandle (curr_process, /* SourceProcessHandle */
- old_handle, /* SourceHandle */
- curr_process, /* TargetProcessHandle */
- (PHANDLE) &new_handle, /* TargetHandle */
- (DWORD) 0, /* DesiredAccess */
- FALSE, /* InheritHandle */
- DUPLICATE_SAME_ACCESS)) /* Options */
- {
- errno = EBADF; /* arbitrary */
- result = -1;
- break;
- }
- duplicated_fd = _open_osfhandle ((long) new_handle, flags);
- if (duplicated_fd < 0)
- {
- CloseHandle (new_handle);
- result = -1;
- break;
- }
- if (duplicated_fd > newfd)
- /* Shouldn't happen, since newfd is still closed. */
- abort ();
- if (duplicated_fd == newfd)
- {
- result = newfd;
- break;
- }
-
- /* Set the bit duplicated_fd in fds_to_close[]. */
- index = (unsigned int) duplicated_fd / CHAR_BIT;
- if (index >= fds_to_close_bound)
- {
- if (index >= sizeof (fds_to_close))
- /* Need to increase OPEN_MAX_MAX. */
- abort ();
- memset (fds_to_close + fds_to_close_bound, '\0',
- index + 1 - fds_to_close_bound);
- fds_to_close_bound = index + 1;
- }
- fds_to_close[index] |= 1 << ((unsigned int) duplicated_fd % CHAR_BIT);
- }
+ {
+ HANDLE new_handle;
+ int duplicated_fd;
+ unsigned int index;
+
+ if (!DuplicateHandle (curr_process, /* SourceProcessHandle */
+ old_handle, /* SourceHandle */
+ curr_process, /* TargetProcessHandle */
+ (PHANDLE) &new_handle, /* TargetHandle */
+ (DWORD) 0, /* DesiredAccess */
+ FALSE, /* InheritHandle */
+ DUPLICATE_SAME_ACCESS)) /* Options */
+ {
+ errno = EBADF; /* arbitrary */
+ result = -1;
+ break;
+ }
+ duplicated_fd = _open_osfhandle ((long) new_handle, flags);
+ if (duplicated_fd < 0)
+ {
+ CloseHandle (new_handle);
+ result = -1;
+ break;
+ }
+ if (duplicated_fd > newfd)
+ /* Shouldn't happen, since newfd is still closed. */
+ abort ();
+ if (duplicated_fd == newfd)
+ {
+ result = newfd;
+ break;
+ }
+
+ /* Set the bit duplicated_fd in fds_to_close[]. */
+ index = (unsigned int) duplicated_fd / CHAR_BIT;
+ if (index >= fds_to_close_bound)
+ {
+ if (index >= sizeof (fds_to_close))
+ /* Need to increase OPEN_MAX_MAX. */
+ abort ();
+ memset (fds_to_close + fds_to_close_bound, '\0',
+ index + 1 - fds_to_close_bound);
+ fds_to_close_bound = index + 1;
+ }
+ fds_to_close[index] |= 1 << ((unsigned int) duplicated_fd % CHAR_BIT);
+ }
/* Close the previous fds that turned out to be too small. */
{
- int saved_errno = errno;
- unsigned int duplicated_fd;
-
- for (duplicated_fd = 0;
- duplicated_fd < fds_to_close_bound * CHAR_BIT;
- duplicated_fd++)
- if ((fds_to_close[duplicated_fd / CHAR_BIT]
- >> (duplicated_fd % CHAR_BIT))
- & 1)
- close (duplicated_fd);
-
- errno = saved_errno;
+ int saved_errno = errno;
+ unsigned int duplicated_fd;
+
+ for (duplicated_fd = 0;
+ duplicated_fd < fds_to_close_bound * CHAR_BIT;
+ duplicated_fd++)
+ if ((fds_to_close[duplicated_fd / CHAR_BIT]
+ >> (duplicated_fd % CHAR_BIT))
+ & 1)
+ close (duplicated_fd);
+
+ errno = saved_errno;
}
+#if REPLACE_FCHDIR
+ if (result == newfd)
+ result = _gl_register_dup (oldfd, newfd);
+#endif
return result;
}
int fcntl_flags;
if ((fcntl_flags = fcntl (newfd, F_GETFD, 0)) < 0
- || fcntl (newfd, F_SETFD, fcntl_flags | FD_CLOEXEC) == -1)
- {
- int saved_errno = errno;
- close (newfd);
- errno = saved_errno;
- return -1;
- }
+ || fcntl (newfd, F_SETFD, fcntl_flags | FD_CLOEXEC) == -1)
+ {
+ int saved_errno = errno;
+ close (newfd);
+ errno = saved_errno;
+ return -1;
+ }
}
#endif
setmode (newfd, O_TEXT);
#endif
+#if REPLACE_FCHDIR
+ newfd = _gl_register_dup (oldfd, newfd);
+#endif
return newfd;
}
projects / gnulib.git / blobdiff