From 74da141e618ef99959d509cb2e7be35a348a39db Mon Sep 17 00:00:00 2001 From: Thomas Guyot-Sionnest Date: Wed, 7 Apr 2010 21:11:46 -0400 Subject: Sync with the latest Gnulib code (177f525) Signed-off-by: Thomas Guyot-Sionnest --- gl/close-hook.c | 91 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 91 insertions(+) create mode 100644 gl/close-hook.c (limited to 'gl/close-hook.c') diff --git a/gl/close-hook.c b/gl/close-hook.c new file mode 100644 index 00000000..0253c4dc --- /dev/null +++ b/gl/close-hook.c @@ -0,0 +1,91 @@ +/* Hook for making the close() function extensible. + Copyright (C) 2009, 2010 Free Software Foundation, Inc. + Written by Bruno Haible , 2009. + + This program is free software: you can redistribute it and/or modify it + under the terms of the GNU General Public License as published + by the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program 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 General Public License + along with this program. If not, see . */ + +#include + +/* Specification. */ +#include "close-hook.h" + +#include +#include + +#undef close + + +/* Currently, this entire code is only needed for the handling of sockets + on native Windows platforms. */ +#if WINDOWS_SOCKETS + +/* The first and last link in the doubly linked list. + Initially the list is empty. */ +static struct close_hook anchor = { &anchor, &anchor, NULL }; + +int +execute_close_hooks (int fd, const struct close_hook *remaining_list) +{ + if (remaining_list == &anchor) + /* End of list reached. */ + return close (fd); + else + return remaining_list->private_fn (fd, remaining_list->private_next); +} + +int +execute_all_close_hooks (int fd) +{ + return execute_close_hooks (fd, anchor.private_next); +} + +void +register_close_hook (close_hook_fn hook, struct close_hook *link) +{ + if (link->private_next == NULL && link->private_prev == NULL) + { + /* Add the link to the doubly linked list. */ + link->private_next = anchor.private_next; + link->private_prev = &anchor; + link->private_fn = hook; + anchor.private_next->private_prev = link; + anchor.private_next = link; + } + else + { + /* The link is already in use. */ + if (link->private_fn != hook) + abort (); + } +} + +void +unregister_close_hook (struct close_hook *link) +{ + struct close_hook *next = link->private_next; + struct close_hook *prev = link->private_prev; + + if (next != NULL && prev != NULL) + { + /* The link is in use. Remove it from the doubly linked list. */ + prev->private_next = next; + next->private_prev = prev; + /* Clear the link, to mark it unused. */ + link->private_next = NULL; + link->private_prev = NULL; + link->private_fn = NULL; + } +} + +#endif -- cgit v1.2.3-74-g34f1