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authorRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
committerRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
commit28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch)
tree15f07c4c43d635959c6afee96bde71fb1b3614ee /sysdeps/mach/hurd/dup2.c
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initial import
Diffstat (limited to 'sysdeps/mach/hurd/dup2.c')
-rw-r--r--sysdeps/mach/hurd/dup2.c114
1 files changed, 114 insertions, 0 deletions
diff --git a/sysdeps/mach/hurd/dup2.c b/sysdeps/mach/hurd/dup2.c
new file mode 100644
index 0000000000..f4ec623b05
--- /dev/null
+++ b/sysdeps/mach/hurd/dup2.c
@@ -0,0 +1,114 @@
+/* Copyright (C) 1991, 1992, 1993, 1994, 1995 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 Library General Public License as
+published by the Free Software Foundation; either version 2 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+#include <ansidecl.h>
+#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
+DEFUN(__dup2, (fd, fd2), int fd AND 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. */
+
+ __mutex_lock (&_hurd_dtable_lock);
+ if (fd2 < 0 || fd2 >= _hurd_dtablesize)
+ {
+ errno = EBADF;
+ fd2 = -1;
+ }
+ else
+ {
+ /* Get a hold of the destination descriptor. */
+ struct hurd_fd *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);
+ }
+
+ HURD_CRITICAL_END;
+
+ return fd2;
+}
+
+weak_alias (__dup2, dup2)