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author | Rajith Muditha Attapattu <rajith@apache.org> | 2007-11-20 13:59:54 +0000 |
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committer | Rajith Muditha Attapattu <rajith@apache.org> | 2007-11-20 13:59:54 +0000 |
commit | bcd011a10c0db4ffc6f78380c548d673e270e000 (patch) | |
tree | ae6961f122221a7ce574e10895be8abcca044f12 /Final/cpp/lib/broker/Daemon.cpp | |
parent | 5b7a0ca8896f20c85f176cd178735554833bcefc (diff) | |
download | qpid-python-bcd011a10c0db4ffc6f78380c548d673e270e000.tar.gz |
backing up the previous tag
git-svn-id: https://svn.apache.org/repos/asf/incubator/qpid/tags/M2@596673 13f79535-47bb-0310-9956-ffa450edef68
Diffstat (limited to 'Final/cpp/lib/broker/Daemon.cpp')
-rw-r--r-- | Final/cpp/lib/broker/Daemon.cpp | 182 |
1 files changed, 0 insertions, 182 deletions
diff --git a/Final/cpp/lib/broker/Daemon.cpp b/Final/cpp/lib/broker/Daemon.cpp deleted file mode 100644 index 3a0e687bf2..0000000000 --- a/Final/cpp/lib/broker/Daemon.cpp +++ /dev/null @@ -1,182 +0,0 @@ -/* - * - * Licensed to the Apache Software Foundation (ASF) under one - * or more contributor license agreements. See the NOTICE file - * distributed with this work for additional information - * regarding copyright ownership. The ASF licenses this file - * to you under the Apache License, Version 2.0 (the - * "License"); you may not use this file except in compliance - * with the License. You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, - * software distributed under the License is distributed on an - * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY - * KIND, either express or implied. See the License for the - * specific language governing permissions and limitations - * under the License. - * - */ -#include "Daemon.h" -#include "Exception.h" - -#include <boost/iostreams/stream.hpp> -#include <boost/iostreams/device/file_descriptor.hpp> - -#include <sstream> - -#include <errno.h> -#include <fcntl.h> -#include <signal.h> -#include <sys/stat.h> -#include <sys/types.h> -#include <unistd.h> - -namespace qpid { -namespace broker { - -using namespace std; -typedef boost::iostreams::stream<boost::iostreams::file_descriptor> fdstream; - -namespace { -/** Throw an exception containing msg and strerror if throwIf is true. - * Name is supposed to be reminiscent of perror(). - */ -void terror(bool throwIf, const string& msg, int errNo=errno) { - if (throwIf) - throw Exception(msg + (errNo? ": "+strError(errNo) : string("."))); -} - - -struct LockFile : public fdstream { - - LockFile(const std::string& path_, bool create) - : path(path_), fd(-1), created(create) - { - errno = 0; - int flags=create ? O_WRONLY|O_CREAT|O_NOFOLLOW : O_RDWR; - fd = ::open(path.c_str(), flags, 0644); - terror(fd < 0,"Cannot open "+path); - terror(::lockf(fd, F_TLOCK, 0) < 0, "Cannot lock "+path); - open(boost::iostreams::file_descriptor(fd)); - } - - ~LockFile() { - if (fd >= 0) { - ::lockf(fd, F_ULOCK, 0); - close(); - } - } - - std::string path; - int fd; - bool created; -}; - -} // namespace - -Daemon::Daemon() { - pid = -1; - pipeFds[0] = pipeFds[1] = -1; -} - -string Daemon::dir() { - return (getuid() == 0 ? "/var/run" : "/tmp"); -} - -string Daemon::pidFile(uint16_t port) { - ostringstream path; - path << dir() << "/qpidd." << port << ".pid"; - return path.str(); -} - -void Daemon::fork() -{ - terror(pipe(pipeFds) < 0, "Can't create pipe"); - terror((pid = ::fork()) < 0, "Daemon fork failed"); - if (pid == 0) { // Child - try { - // File descriptors - terror(::close(pipeFds[0])<0, "Cannot close read pipe"); - terror(::close(0)<0, "Cannot close stdin"); - terror(::close(1)<0, "Cannot close stdout"); - terror(::close(2)<0, "Cannot close stderr"); - int fd=::open("/dev/null",O_RDWR); // stdin - terror(fd != 0, "Cannot re-open stdin"); - terror(::dup(fd)<0, "Cannot re-open stdout"); - terror(::dup(fd)<0, "Cannot re-open stderror"); - - // Misc - terror(setsid()<0, "Cannot set session ID"); - terror(chdir(dir().c_str()) < 0, "Cannot change directory to "+dir()); - umask(027); - - // Child behavior - child(); - } - catch (const exception& e) { - fdstream pipe(pipeFds[1]); - assert(pipe.is_open()); - pipe << "0 " << e.what() << endl; - } - } - else { // Parent - close(pipeFds[1]); // Write side. - parent(); - } -} - -Daemon::~Daemon() { - if (!lockFile.empty()) - unlink(lockFile.c_str()); -} - -uint16_t Daemon::wait(int timeout) { // parent waits for child. - errno = 0; - struct timeval tv; - tv.tv_sec = timeout; - tv.tv_usec = 0; - - fd_set fds; - FD_ZERO(&fds); - FD_SET(pipeFds[0], &fds); - terror(1 != select(FD_SETSIZE, &fds, 0, 0, &tv), "No response from daemon process"); - - fdstream pipe(pipeFds[0]); - uint16_t value = 0; - pipe >> value >> skipws; - if (value == 0) { - string errmsg; - getline(pipe, errmsg); - throw Exception("Daemon startup failed"+ (errmsg.empty() ? string(".") : ": " + errmsg)); - } - return value; -} - -void Daemon::ready(uint16_t port) { // child - lockFile = pidFile(port); - LockFile lf(lockFile, true); - lf << getpid() << endl; - if (lf.fail()) - throw Exception("Cannot write lock file "+lockFile); - fdstream pipe(pipeFds[1]); - pipe << port << endl;; -} - -pid_t Daemon::getPid(uint16_t port) { - string name = pidFile(port); - LockFile lockFile(name, false); - pid_t pid; - lockFile >> pid; - if (lockFile.fail()) - throw Exception("Cannot read lock file "+name); - if (kill(pid, 0) < 0 && errno != EPERM) { - unlink(name.c_str()); - throw Exception("Removing stale lock file "+name); - } - return pid; -} - - -}} // namespace qpid::broker |