+2012-05-10 Thomas Schwinge <thomas@schwinge.name>
+
+ dup3 for GNU Hurd.
+ * include/unistd.h: Declare __dup3 and use libc_hidden_proto on it.
+ * sysdeps/mach/hurd/dup3.c: New file, copy from dup2.c. Evolve it to
+ implement dup3 and do some further code clean-ups.
+ * sysdeps/mach/hurd/dup2.c (__dup2): Reimplement using __dup3.
+ * sysdeps/mach/hurd/kernel-features.h (__ASSUME_DUP3): Define.
+
2012-05-10 Samuel Thibault <samuel.thibault@ens-lyon.org>
* sysdeps/mach/hurd/dl-sysdep.c: Conditionalize contents on [SHARED].
extern int __dup (int __fd);
extern int __dup2 (int __fd, int __fd2);
libc_hidden_proto (__dup2)
-libc_hidden_proto (dup3)
+extern int __dup3 (int __fd, int __fd2, int flags);
+libc_hidden_proto (__dup3)
extern int __execve (const char *__path, char *const __argv[],
char *const __envp[]);
extern long int __pathconf (const char *__path, int __name);
-/* Copyright (C) 1991, 92, 93, 94, 95, 97, 2002 Free Software Foundation, Inc.
+/* Copyright (C) 1991-2012 Free Software Foundation, Inc.
+
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
-#include <errno.h>
-#include <fcntl.h>
#include <unistd.h>
-#include <hurd.h>
-#include <hurd/fd.h>
/* Duplicate FD to FD2, closing the old FD2 and making FD2 be
open on the same file as FD is. Return FD2 or -1. */
int
-__dup2 (fd, fd2)
- int fd;
- int fd2;
+__dup2 (int fd, int fd2)
{
- struct hurd_fd *d;
-
- /* Extract the ports and flags from FD. */
- d = _hurd_fd_get (fd);
- if (d == NULL)
- {
- errno = EBADF;
- return -1;
- }
-
- HURD_CRITICAL_BEGIN;
-
- __spin_lock (&d->port.lock);
- if (d->port.port == MACH_PORT_NULL)
- {
- __spin_unlock (&d->port.lock);
- errno = EBADF;
- fd2 = -1;
- }
- else if (fd2 == fd)
- /* FD is valid and FD2 is already the same; just return it. */
- __spin_unlock (&d->port.lock);
- else
- {
- struct hurd_userlink ulink, ctty_ulink;
- int flags = d->flags;
- io_t ctty = _hurd_port_get (&d->ctty, &ctty_ulink);
- io_t port = _hurd_port_locked_get (&d->port, &ulink); /* Unlocks D. */
-
- if (fd2 < 0)
- {
- errno = EBADF;
- fd2 = -1;
- }
- else
- {
- /* Get a hold of the destination descriptor. */
- struct hurd_fd *d2;
-
- if (fd2 >= _hurd_dtablesize)
- {
- /* The table is not large enough to hold the destination
- descriptor. Enlarge it as necessary to allocate this
- descriptor. */
- __mutex_unlock (&_hurd_dtable_lock);
- /* We still hold FD1's lock, but this is safe because
- _hurd_alloc_fd will only examine the cells starting
- at FD2. */
- d2 = _hurd_alloc_fd (NULL, fd2);
- if (d2)
- __spin_unlock (&d2->port.lock);
- __mutex_lock (&_hurd_dtable_lock);
- }
- else
- {
- d2 = _hurd_dtable[fd2];
- if (d2 == NULL)
- {
- /* Must allocate a new one. We don't initialize the port
- cells with this call so that if it fails (out of
- memory), we will not have already added user
- references for the ports, which we would then have to
- deallocate. */
- d2 = _hurd_dtable[fd2] = _hurd_new_fd (MACH_PORT_NULL,
- MACH_PORT_NULL);
- }
- }
-
- if (d2 == NULL)
- {
- fd2 = -1;
- if (errno == EINVAL)
- errno = EBADF; /* POSIX.1-1990 6.2.1.2 ll 54-55. */
- }
- else
- {
- /* Give the ports each a user ref for the new descriptor. */
- __mach_port_mod_refs (__mach_task_self (), port,
- MACH_PORT_RIGHT_SEND, 1);
- if (ctty != MACH_PORT_NULL)
- __mach_port_mod_refs (__mach_task_self (), ctty,
- MACH_PORT_RIGHT_SEND, 1);
-
- /* Install the ports and flags in the new descriptor slot. */
- __spin_lock (&d2->port.lock);
- d2->flags = flags & ~FD_CLOEXEC; /* Dup clears FD_CLOEXEC. */
- _hurd_port_set (&d2->ctty, ctty);
- _hurd_port_locked_set (&d2->port, port); /* Unlocks D2. */
- }
- }
- __mutex_unlock (&_hurd_dtable_lock);
-
- _hurd_port_free (&d->port, &ulink, port);
- if (ctty != MACH_PORT_NULL)
- _hurd_port_free (&d->ctty, &ctty_ulink, port);
- }
+ int flags = 0;
- HURD_CRITICAL_END;
+ if (fd2 == fd)
+ /* See the comment in dup3. */
+ flags = -1;
- return fd2;
+ return __dup3 (fd, fd2, flags);
}
libc_hidden_def (__dup2)
weak_alias (__dup2, dup2)
--- /dev/null
+/* Duplicate a file descriptor to a given number, with flags. Hurd version.
+ Copyright (C) 1991-2012 Free Software Foundation, Inc.
+
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <hurd.h>
+#include <hurd/fd.h>
+
+/* Duplicate FD to FD2, closing the old FD2 and making FD2 be
+ open on the same file as FD is, and setting FD2's flags according to FLAGS.
+ Return FD2 or -1. */
+int
+__dup3 (int fd, int fd2, int flags)
+{
+ struct hurd_fd *d;
+
+ /* Both passing flags different from O_CLOEXEC and FD2 being the same as FD
+ are invalid. */
+ if ((flags & ~O_CLOEXEC
+ || fd2 == fd)
+ /* ... with the exception in case that dup2 behavior is requested: if FD
+ is valid and FD2 is already the same then just return it. */
+ && ! (flags == -1
+ && fd2 == fd))
+ return __hurd_fail (EINVAL);
+
+ /* Extract the ports and flags from FD. */
+ d = _hurd_fd_get (fd);
+ if (d == NULL)
+ return __hurd_fail (EBADF);
+
+ HURD_CRITICAL_BEGIN;
+
+ __spin_lock (&d->port.lock);
+ if (d->port.port == MACH_PORT_NULL)
+ {
+ __spin_unlock (&d->port.lock);
+ fd2 = __hurd_fail (EBADF);
+ }
+ else if (fd2 == fd)
+ __spin_unlock (&d->port.lock);
+ else
+ {
+ struct hurd_userlink ulink, ctty_ulink;
+ int d_flags = d->flags;
+ io_t ctty = _hurd_port_get (&d->ctty, &ctty_ulink);
+ io_t port = _hurd_port_locked_get (&d->port, &ulink); /* Unlocks D. */
+
+ if (fd2 < 0)
+ fd2 = __hurd_fail (EBADF);
+ else
+ {
+ /* Get a hold of the destination descriptor. */
+ struct hurd_fd *d2;
+
+ if (fd2 >= _hurd_dtablesize)
+ {
+ /* The table is not large enough to hold the destination
+ descriptor. Enlarge it as necessary to allocate this
+ descriptor. */
+ __mutex_unlock (&_hurd_dtable_lock);
+ /* We still hold FD1's lock, but this is safe because
+ _hurd_alloc_fd will only examine the cells starting
+ at FD2. */
+ d2 = _hurd_alloc_fd (NULL, fd2);
+ if (d2)
+ __spin_unlock (&d2->port.lock);
+ __mutex_lock (&_hurd_dtable_lock);
+ }
+ else
+ {
+ d2 = _hurd_dtable[fd2];
+ if (d2 == NULL)
+ {
+ /* Must allocate a new one. We don't initialize the port
+ cells with this call so that if it fails (out of
+ memory), we will not have already added user
+ references for the ports, which we would then have to
+ deallocate. */
+ d2 = _hurd_dtable[fd2] = _hurd_new_fd (MACH_PORT_NULL,
+ MACH_PORT_NULL);
+ }
+ }
+
+ if (d2 == NULL)
+ {
+ fd2 = -1;
+ if (errno == EINVAL)
+ errno = EBADF; /* POSIX.1-1990 6.2.1.2 ll 54-55. */
+ }
+ else
+ {
+ /* Give the ports each a user ref for the new descriptor. */
+ __mach_port_mod_refs (__mach_task_self (), port,
+ MACH_PORT_RIGHT_SEND, 1);
+ if (ctty != MACH_PORT_NULL)
+ __mach_port_mod_refs (__mach_task_self (), ctty,
+ MACH_PORT_RIGHT_SEND, 1);
+
+ /* Install the ports and flags in the new descriptor slot. */
+ __spin_lock (&d2->port.lock);
+ if (flags & O_CLOEXEC)
+ d2->flags = d_flags | FD_CLOEXEC;
+ else
+ /* dup clears FD_CLOEXEC. */
+ d2->flags = d_flags & ~FD_CLOEXEC;
+ _hurd_port_set (&d2->ctty, ctty);
+ _hurd_port_locked_set (&d2->port, port); /* Unlocks D2. */
+ }
+ }
+ __mutex_unlock (&_hurd_dtable_lock);
+
+ _hurd_port_free (&d->port, &ulink, port);
+ if (ctty != MACH_PORT_NULL)
+ _hurd_port_free (&d->ctty, &ctty_ulink, port);
+ }
+
+ HURD_CRITICAL_END;
+
+ return fd2;
+}
+libc_hidden_def (__dup3)
+weak_alias (__dup3, dup3)
/* Set flags signalling availability of certain operating system features.
- Copyright (C) 2007-2012 Free Software Foundation, Inc.
+ Copyright (C) 2012 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
Almost none of these are used outside of sysdeps/unix/sysv/linux code.
But those referring to POSIX-level features like O_* flags can be. */
-#include <fcntl.h>
-
-/* If a system defines the O_CLOEXEC constant but it is sometimes ignored,
- it must override this file to define __ASSUME_O_CLOEXEC conditionally
- (or not at all) to indicate when O_CLOEXEC actually works. */
-#ifdef O_CLOEXEC
-# define __ASSUME_O_CLOEXEC 1
-#endif
-
+#define __ASSUME_O_CLOEXEC 1
+#define __ASSUME_DUP3 1
#define __ASSUME_ACCEPT4 1
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