2019-11-17 20:10:56 +00:00
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/*
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2020-02-02 05:24:51 +00:00
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Copyright (c) 2014-2020, The Monero Project
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2019-11-17 20:10:56 +00:00
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All rights reserved.
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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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1. Redistributions of source code must retain the above copyright notice, this
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list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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3. Neither the name of the copyright holder nor the names of its contributors
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may be used to endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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Parts of the project are originally copyright (c) 2012-2013 The Cryptonote
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developers.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <signal.h>
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void
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forkoff(const char *pidname)
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{
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FILE *pidfile = NULL;
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if (pidname)
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{
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pidfile = fopen(pidname, "r");
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unsigned pid;
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if (pidfile)
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{
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if (fscanf(pidfile, "%u", &pid) > 0 && pid > 1 && kill(pid, 0) == 0)
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{
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printf("Already running, no need to start again.\n");
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fclose(pidfile);
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exit(1);
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}
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fclose(pidfile);
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pidfile = 0;
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}
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pidfile = fopen(pidname, "w");
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if (!pidfile)
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{
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printf("Cannot open PID file for writing. Aborting.\n");
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exit(1);
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}
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}
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pid_t pid;
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if ((pid = fork()))
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{
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if (pid > 0)
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{
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if (pidfile) fclose(pidfile);
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exit(0);
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}
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else
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{
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printf("First fork failed. Aborting.\n");
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exit(1);
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}
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}
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setsid();
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if ((pid = fork()))
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{
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if (pid > 0)
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{
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if (pidfile) fclose(pidfile);
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exit(0);
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}
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else
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{
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printf("Second fork failed. Aborting.\n");
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exit(1);
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}
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}
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if (pidfile)
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{
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fprintf(pidfile, "%u", getpid());
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fclose(pidfile);
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}
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close(0);
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close(1);
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close(2);
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/* no stdin */
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if (open("/dev/null", O_RDONLY) < 0)
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{
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printf("Failed to open /dev/null for input. Aborting.\n");
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exit(1);
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}
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/* no stdout */
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if (open("/dev/null", O_WRONLY) < 0)
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{
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printf("Failed to open /dev/null for output. Aborting.\n");
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exit(1);
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}
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/* stdout to stderror */
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if (dup(1) < 0)
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{
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printf("Unable to dup stdout to stderror\n");
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exit(1);
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}
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}
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