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/* |
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* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd) |
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* |
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* Copyright (c) 1997-2014 ircd-hybrid development team |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
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* USA |
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*/ |
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|
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/*! \file fdlist.c |
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* \brief Maintains a list of file descriptors. |
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* \version $Id$ |
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*/ |
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|
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#include "stdinc.h" |
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#include "fdlist.h" |
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#include "client.h" /* struct Client */ |
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#include "event.h" |
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#include "ircd.h" /* GlobalSetOptions */ |
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#include "irc_string.h" |
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#include "s_bsd.h" /* comm_setselect */ |
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#include "conf.h" /* ServerInfo */ |
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#include "send.h" |
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#include "memory.h" |
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#include "numeric.h" |
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#include "s_misc.h" |
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#include "irc_res.h" |
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|
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fde_t *fd_hash[FD_HASH_SIZE]; |
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fde_t *fd_next_in_loop = NULL; |
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int number_fd = LEAKED_FDS; |
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int hard_fdlimit = 0; |
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|
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|
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static int |
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set_fdlimit(void) |
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{ |
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int fdmax; |
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struct rlimit limit; |
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|
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if (!getrlimit(RLIMIT_NOFILE, &limit)) |
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{ |
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limit.rlim_cur = limit.rlim_max; |
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setrlimit(RLIMIT_NOFILE, &limit); |
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} |
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|
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fdmax = getdtablesize(); |
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|
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/* allow MAXCLIENTS_MIN clients even at the cost of MAX_BUFFER and |
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* some not really LEAKED_FDS */ |
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fdmax = IRCD_MAX(fdmax, LEAKED_FDS + MAX_BUFFER + MAXCLIENTS_MIN); |
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|
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/* under no condition shall this raise over 65536 |
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* for example user ip heap is sized 2*hard_fdlimit */ |
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hard_fdlimit = IRCD_MIN(fdmax, 65536); |
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|
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return -1; |
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} |
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|
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void |
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fdlist_init(void) |
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{ |
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set_fdlimit(); |
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} |
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|
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static inline unsigned int |
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hash_fd(int fd) |
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{ |
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return ((unsigned int)fd) % FD_HASH_SIZE; |
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} |
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|
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fde_t * |
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lookup_fd(int fd) |
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{ |
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fde_t *F = fd_hash[hash_fd(fd)]; |
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|
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while (F) |
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{ |
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if (F->fd == fd) |
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return F; |
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F = F->hnext; |
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} |
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|
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return NULL; |
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} |
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|
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/* Called to open a given filedescriptor */ |
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void |
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fd_open(fde_t *F, int fd, int is_socket, const char *desc) |
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{ |
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unsigned int hashv = hash_fd(fd); |
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assert(fd >= 0); |
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|
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F->fd = fd; |
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F->comm_index = -1; |
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if (desc) |
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strlcpy(F->desc, desc, sizeof(F->desc)); |
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/* Note: normally we'd have to clear the other flags, |
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* but currently F is always cleared before calling us.. */ |
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F->flags.open = 1; |
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F->flags.is_socket = is_socket; |
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F->hnext = fd_hash[hashv]; |
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fd_hash[hashv] = F; |
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|
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number_fd++; |
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} |
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|
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/* Called to close a given filedescriptor */ |
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void |
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fd_close(fde_t *F) |
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{ |
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unsigned int hashv = hash_fd(F->fd); |
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|
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if (F == fd_next_in_loop) |
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fd_next_in_loop = F->hnext; |
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|
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if (F->flags.is_socket) |
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comm_setselect(F, COMM_SELECT_WRITE | COMM_SELECT_READ, NULL, NULL, 0); |
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|
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delete_resolver_queries(F); |
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|
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#ifdef HAVE_LIBCRYPTO |
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if (F->ssl) |
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SSL_free(F->ssl); |
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#endif |
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|
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if (fd_hash[hashv] == F) |
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fd_hash[hashv] = F->hnext; |
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else { |
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fde_t *prev; |
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|
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/* let it core if not found */ |
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for (prev = fd_hash[hashv]; prev->hnext != F; prev = prev->hnext) |
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; |
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prev->hnext = F->hnext; |
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} |
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|
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/* Unlike squid, we're actually closing the FD here! -- adrian */ |
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close(F->fd); |
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number_fd--; |
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|
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memset(F, 0, sizeof(fde_t)); |
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} |
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|
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/* |
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* fd_dump() - dump the list of active filedescriptors |
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*/ |
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void |
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fd_dump(struct Client *source_p) |
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{ |
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int i; |
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fde_t *F; |
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|
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for (i = 0; i < FD_HASH_SIZE; i++) |
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for (F = fd_hash[i]; F != NULL; F = F->hnext) |
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sendto_one(source_p, ":%s %d %s :fd %-5d desc '%s'", |
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me.name, RPL_STATSDEBUG, source_p->name, |
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F->fd, F->desc); |
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} |
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|
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/* |
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* fd_note() - set the fd note |
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* |
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* Note: must be careful not to overflow fd_table[fd].desc when |
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* calling. |
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*/ |
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void |
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fd_note(fde_t *F, const char *format, ...) |
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{ |
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va_list args; |
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|
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if (format != NULL) |
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{ |
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va_start(args, format); |
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vsnprintf(F->desc, sizeof(F->desc), format, args); |
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va_end(args); |
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} |
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else |
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F->desc[0] = '\0'; |
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} |
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|
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/* Make sure stdio descriptors (0-2) and profiler descriptor (3) |
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* always go somewhere harmless. Use -foreground for profiling |
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* or executing from gdb */ |
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void |
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close_standard_fds(void) |
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{ |
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int i; |
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|
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for (i = 0; i < LOWEST_SAFE_FD; i++) |
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{ |
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close(i); |
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if (open("/dev/null", O_RDWR) < 0) |
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exit(-1); /* we're hosed if we can't even open /dev/null */ |
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} |
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} |
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|
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void |
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close_fds(fde_t *one) |
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{ |
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int i; |
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fde_t *F; |
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|
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for (i = 0; i < FD_HASH_SIZE; i++) |
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for (F = fd_hash[i]; F != NULL; F = F->hnext) |
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if (F != one) |
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close(F->fd); |
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} |
