1a78a94f70
At least some Panasonic clients try to open more than 5 simultaneous connections to the server. If we keep the default of 5 max children, it results in choppy playback on those clients. Make this setting configurable, and default to 50 max connections. Our process is pretty lightweight, so 50 children should not be a problem on most systems.
162 lines
3.5 KiB
C
162 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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else if (pid == 0)
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break;
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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))
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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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