160 lines
3.5 KiB
C
160 lines
3.5 KiB
C
/* Process handling
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*
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* Copyright © 2006, Thomas Bernard
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* Copyright © 2013, Benoît Knecht <benoit.knecht@fsfe.org>
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <string.h>
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#include <signal.h>
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#include <sys/wait.h>
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#include "upnpglobalvars.h"
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#include "process.h"
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#include "config.h"
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#include "log.h"
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static int number_of_children = 0;
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pid_t
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process_fork(void)
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{
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if (number_of_children >= runtime_vars.max_connections)
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{
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DPRINTF(E_WARN, L_GENERAL, "Exceeded max connections [%d], not forking\n",
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runtime_vars.max_connections);
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errno = EAGAIN;
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return -1;
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}
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pid_t pid = fork();
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if (pid > 0)
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++number_of_children;
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return pid;
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}
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void
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process_handle_child_termination(int signal)
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{
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pid_t pid;
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while ((pid = waitpid(-1, NULL, WNOHANG)))
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{
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if (pid == -1)
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{
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if (errno == EINTR)
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continue;
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else
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break;
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}
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--number_of_children;
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}
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}
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int
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process_daemonize(void)
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{
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int pid;
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#ifndef USE_DAEMON
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int i;
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switch(process_fork())
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{
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/* fork error */
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case -1:
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perror("fork()");
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exit(1);
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/* child process */
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case 0:
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/* obtain a new process group */
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if( (pid = setsid()) < 0)
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{
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perror("setsid()");
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exit(1);
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}
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/* close all descriptors */
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for (i=getdtablesize();i>=0;--i) close(i);
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i = open("/dev/null",O_RDWR); /* open stdin */
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dup(i); /* stdout */
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dup(i); /* stderr */
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umask(027);
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chdir("/");
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break;
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/* parent process */
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default:
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exit(0);
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}
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#else
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if( daemon(0, 0) < 0 )
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perror("daemon()");
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pid = getpid();
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#endif
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return pid;
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}
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int
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process_check_if_running(const char *fname)
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{
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char buffer[64];
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int pidfile;
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pid_t pid;
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if(!fname || *fname == '\0')
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return -1;
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if( (pidfile = open(fname, O_RDONLY)) < 0)
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return 0;
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memset(buffer, 0, 64);
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if(read(pidfile, buffer, 63) > 0)
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{
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if( (pid = atol(buffer)) > 0)
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{
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if(!kill(pid, 0))
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{
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close(pidfile);
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return -2;
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}
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}
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}
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close(pidfile);
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return 0;
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}
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