MainLinux.cpp
上传用户:woshihumen
上传日期:2013-07-18
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文件大小:8k
- /*
- * XMail by Davide Libenzi ( Intranet and Internet mail server )
- * Copyright (C) 1999,..,2004 Davide Libenzi
- *
- * 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 2 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 General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- * Davide Libenzi <davidel@xmailserver.org>
- *
- */
- #include "SysInclude.h"
- #include "SysDep.h"
- #include "SvrDefines.h"
- #include "SList.h"
- #include "ShBlocks.h"
- #include "UsrUtils.h"
- #include "SvrUtils.h"
- #include "MessQueue.h"
- #include "SMAILUtils.h"
- #include "QueueUtils.h"
- #include "AppDefines.h"
- #include "MailSvr.h"
- #define RUNNING_PIDS_DIR "/var/run"
- #define DEVNULL "/dev/null"
- #define NOFILE 64
- #define XMAIL_DEBUG_OPTION "-Md"
- #define XMAIL_PIDDIR_ENV "XMAIL_PID_DIR"
- static int MnEventLog(char const *pszFormat, ...);
- static char const *MnGetPIDDir(void);
- static int MnSavePID(char const *pszPidFile);
- static int MnRemovePID(char const *pszPidFile);
- static void MnSetupStdHandles(void);
- static int MnDaemonBootStrap(void);
- static int MnIsDebugStartup(int iArgCount, char *pszArgs[]);
- static int MnDaemonStartup(int iArgCount, char *pszArgs[]);
- static int MnEventLog(char const *pszFormat, ...)
- {
- openlog(APP_NAME_STR, LOG_PID, LOG_DAEMON);
- va_list Args;
- va_start(Args, pszFormat);
- char szBuffer[2048] = "";
- vsnprintf(szBuffer, sizeof(szBuffer) - 1, pszFormat, Args);
- syslog(LOG_ERR, "%s", szBuffer);
- va_end(Args);
- closelog();
- return (0);
- }
- static char const *MnGetPIDDir(void)
- {
- char const *pszPIDDir = getenv(XMAIL_PIDDIR_ENV);
- return ((pszPIDDir != NULL) ? pszPIDDir: RUNNING_PIDS_DIR);
- }
- static int MnSavePID(char const *pszPidFile)
- {
- char szPidFile[SYS_MAX_PATH] = "";
- snprintf(szPidFile, sizeof(szPidFile) - 1, "%s/%s.pid", MnGetPIDDir(), pszPidFile);
- FILE *pFile = fopen(szPidFile, "w");
- if (pFile == NULL) {
- perror(szPidFile);
- return (-errno);
- }
- fprintf(pFile, "%u", (unsigned int) getpid());
- fclose(pFile);
- return (0);
- }
- static int MnRemovePID(char const *pszPidFile)
- {
- char szPidFile[SYS_MAX_PATH] = "";
- snprintf(szPidFile, sizeof(szPidFile) - 1, "%s/%s.pid", MnGetPIDDir(), pszPidFile);
- if (unlink(szPidFile) != 0) {
- perror(szPidFile);
- return (-errno);
- }
- return (0);
- }
- static void MnSetupStdHandles(void)
- {
- int iFD = open(DEVNULL, O_RDWR, 0);
- if (iFD == -1) {
- MnEventLog("Cannot open file %s : %s", DEVNULL, strerror(errno));
- exit(errno);
- }
- if ((dup2(iFD, 0) == -1) || (dup2(iFD, 1) == -1) || (dup2(iFD, 2) == -1)) {
- MnEventLog("File descriptor duplication error : %s", strerror(errno));
- exit(errno);
- }
- close(iFD);
- }
- static int MnDaemonBootStrap(void)
- {
- ///////////////////////////////////////////////////////////////////////////////
- // This code is inspired from the code of the great Richard Stevens books.
- // May You RIP in programmers paradise great Richard.
- // I suggest You to buy all his collection, soon !
- ///////////////////////////////////////////////////////////////////////////////
- ///////////////////////////////////////////////////////////////////////////////
- // For BSD
- ///////////////////////////////////////////////////////////////////////////////
- #ifdef SIGTTOU
- signal(SIGTTOU, SIG_IGN);
- #endif
- #ifdef SIGTTIN
- signal(SIGTTIN, SIG_IGN);
- #endif
- #ifdef SIGTSTP
- signal(SIGTSTP, SIG_IGN);
- #endif
- ///////////////////////////////////////////////////////////////////////////////
- // 1st fork
- ///////////////////////////////////////////////////////////////////////////////
- int iChildPID = fork();
- if (iChildPID < 0) {
- MnEventLog("Cannot fork : %s", strerror(errno));
- exit(errno);
- } else if (iChildPID > 0)
- exit(0);
- ///////////////////////////////////////////////////////////////////////////////
- // Disassociate from controlling terminal and process group. Ensure the process
- // can't reacquire a new controlling terminal.
- ///////////////////////////////////////////////////////////////////////////////
- if (setpgrp() == -1) {
- MnEventLog("Can't change process group : %s", strerror(errno));
- exit(errno);
- }
- signal(SIGHUP, SIG_IGN);
- ///////////////////////////////////////////////////////////////////////////////
- // 2nd fork
- ///////////////////////////////////////////////////////////////////////////////
- iChildPID = fork();
- if (iChildPID < 0) {
- MnEventLog("Cannot fork : %s", strerror(errno));
- exit(errno);
- } else if (iChildPID > 0)
- exit(0);
- ///////////////////////////////////////////////////////////////////////////////
- // Close open file descriptors
- ///////////////////////////////////////////////////////////////////////////////
- for (int fd = 0; fd < NOFILE; fd++)
- close(fd);
- ///////////////////////////////////////////////////////////////////////////////
- // Set std handles
- ///////////////////////////////////////////////////////////////////////////////
- MnSetupStdHandles();
- ///////////////////////////////////////////////////////////////////////////////
- // Probably got set to EBADF from a close
- ///////////////////////////////////////////////////////////////////////////////
- errno = 0;
- ///////////////////////////////////////////////////////////////////////////////
- // Move the current directory to root, to make sure we aren't on a mounted
- // filesystem.
- ///////////////////////////////////////////////////////////////////////////////
- chdir("/");
- ///////////////////////////////////////////////////////////////////////////////
- // Clear any inherited file mode creation mask.
- ///////////////////////////////////////////////////////////////////////////////
- umask(0);
- ///////////////////////////////////////////////////////////////////////////////
- // Ignore childs dead.
- ///////////////////////////////////////////////////////////////////////////////
- ///////////////////////////////////////////////////////////////////////////////
- // System V
- ///////////////////////////////////////////////////////////////////////////////
- signal(SIGCLD, SIG_IGN);
- return (0);
- }
- static int MnIsDebugStartup(int iArgCount, char *pszArgs[])
- {
- for (int ii = 0; ii < iArgCount; ii++)
- if (strcmp(pszArgs[ii], XMAIL_DEBUG_OPTION) == 0)
- return (1);
- return (0);
- }
- static int MnDaemonStartup(int iArgCount, char *pszArgs[])
- {
- ///////////////////////////////////////////////////////////////////////////////
- // Daemon bootstrap code if We're not in debug mode
- ///////////////////////////////////////////////////////////////////////////////
- if (!MnIsDebugStartup(iArgCount, pszArgs))
- MnDaemonBootStrap();
- ///////////////////////////////////////////////////////////////////////////////
- // Extract PID file name
- ///////////////////////////////////////////////////////////////////////////////
- char const *pszPidFile = strrchr(pszArgs[0], '/');
- pszPidFile = (pszPidFile != NULL) ? (pszPidFile + 1): pszArgs[0];
- ///////////////////////////////////////////////////////////////////////////////
- // Create PID file
- ///////////////////////////////////////////////////////////////////////////////
- MnSavePID(pszPidFile);
- int iServerResult = SvrMain(iArgCount, pszArgs);
- ///////////////////////////////////////////////////////////////////////////////
- // Remove PID file
- ///////////////////////////////////////////////////////////////////////////////
- MnRemovePID(pszPidFile);
- return (iServerResult);
- }
- int main(int iArgCount, char *pszArgs[])
- {
- return (MnDaemonStartup(iArgCount, pszArgs));
- }