/* Copyright (C) 1991, 92, 93, 94, 95, 97, 2002 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 #include #include #include #include /* 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; { 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); } HURD_CRITICAL_END; return fd2; } libc_hidden_def (__dup2) weak_alias (__dup2, dup2)