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/*
TACACS+ D-Bus Daemon code
Copyright (c) 2019 AT&T Intellectual Property.
Copyright (c) 2015-2016 Brocade Communications Systems, Inc.
SPDX-License-Identifier: GPL-2.0-only
*/
#include "daemon.h"
/* TODO
* -use strerror_r() instead of strerror()
*/
/* TODO: Take filename from command line */
static void record_pid(const char *fname)
{
FILE *f = fopen(fname, "w");
if (f == NULL) {
/* TODO: append strerr() */
syslog(LOG_ERR, "Failed to open pid file: %s", fname);
return;
}
fprintf(f, "%u\n", getpid());
fclose(f);
}
void daemonize(const char *tacplus_pid)
{
/* 0 returned in child */
if (fork() != 0) {
exit(EXIT_SUCCESS); /* parent exit */
}
/* Become new process group leader */
if (setsid() < 0) {
fprintf(stderr, "setsid() failed. Error: %s", strerror(errno));
exit(EXIT_FAILURE);
}
/* Overwrite parent's cwd */
if(chdir("/") < 0) {
fprintf(stderr, "Changing cwd to root directory failed. Error: %s",
strerror(errno));
exit(EXIT_FAILURE);
}
/* Close standard file descriptors */
close(STDIN_FILENO);
close(STDOUT_FILENO);
close(STDERR_FILENO);
/* Reset file permissions */
umask(0);
record_pid(tacplus_pid);
}
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