138 lines
3.7 KiB
C++
138 lines
3.7 KiB
C++
/* Copyright (C) 2009 Wildfire Games.
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* This file is part of 0 A.D.
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*
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* 0 A.D. 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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* 0 A.D. 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 0 A.D. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "precompiled.h"
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#include <map>
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#include <string>
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#include "lib/sysdep/sysdep.h"
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#include "lib/sysdep/dir_watch.h"
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#include "ps/CLogger.h"
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#include <fam.h>
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static FAMConnection fc;
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// trool; -1 = init failed and all operations will be aborted silently.
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// this is so that each dir_* call doesn't complain if the system's
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// FAM is broken or unavailable.
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static int initialized = 0;
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static std::map<intptr_t, std::string> dirs;
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// for atexit
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static void fam_deinit()
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{
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FAMClose(&fc);
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}
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LibError dir_add_watch(const char* const n_full_path, intptr_t* const watch)
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{
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// init already failed; don't try again or complain
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if(initialized == -1)
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return ERR::FAIL; // NOWARN
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if(!initialized)
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{
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// success
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if(FAMOpen2(&fc, "lib_res") == 0)
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{
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initialized = 1;
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atexit(fam_deinit);
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}
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else
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{
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initialized = -1;
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LOG(CLogger::Error, "", "Error initializing FAM; hotloading will be disabled");
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return ERR::FAIL; // NOWARN
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}
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}
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FAMRequest req;
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if(FAMMonitorDirectory(&fc, n_full_path, &req, (void*)0) < 0)
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{
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*watch = -1;
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debug_warn("res_watch_dir failed!");
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WARN_RETURN(ERR::FAIL); // no way of getting error code?
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}
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// Monitoring a directory causes a FAMExists event per file in that directory, then a
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// FAMEndExist. We have to wait for these events, else the FAM server's write buffer fills
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// up and we get deadlocked when trying to open another directory. (That happens only with
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// the original fam, and seems fixed in gamin, but we want to work with both.)
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FAMEvent e;
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do {
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if(FAMNextEvent(&fc, &e) < 0)
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{
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// Oops, failed - rather than getting stuck waiting forever for a
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// FAMEndExist event that may never come, just give up and return now.
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debug_warn("FAMNextEvent failed");
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return ERR::FAIL;
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}
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// (We might be missing some real events other than the FAMExists ones, if
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// they happen to be generated right now. That's not a critical problem, so
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// just ignore it.)
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}
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while (e.code != FAMEndExist);
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*watch = (intptr_t)req.reqnum;
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dirs[*watch] = n_full_path;
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return INFO::OK;
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}
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LibError dir_cancel_watch(const intptr_t watch)
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{
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if(initialized == -1)
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return ERR::FAIL; // NOWARN
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if(!initialized)
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WARN_RETURN(ERR::LOGIC);
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FAMRequest req;
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req.reqnum = (int)watch;
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RETURN_ERR(FAMCancelMonitor(&fc, &req));
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return INFO::OK;
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}
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LibError dir_get_changed_file(char* fn)
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{
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if(initialized == -1)
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return ERR::FAIL; // NOWARN
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if(!initialized) // XXX Fix Atlas instead of supressing the warning
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return ERR::FAIL; //WARN_RETURN(ERR::LOGIC);
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FAMEvent e;
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while(FAMPending(&fc) > 0)
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{
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if(FAMNextEvent(&fc, &e) >= 0)
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{
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if (e.code == FAMChanged || e.code == FAMCreated || e.code == FAMDeleted)
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{
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char n_path[PATH_MAX];
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const char* dir = dirs[e.fr.reqnum].c_str();
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snprintf(n_path, PATH_MAX, "%s%c%s", dir, SYS_DIR_SEP, e.filename);
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UNUSED2(fn); // we ought to copy to fn, but this code is apparently disabled..
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return ERR::AGAIN;
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}
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}
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}
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// just nothing new; try again later
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return ERR::AGAIN; // NOWARN
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}
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