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/*
* Copyright (c) 1999 - 2001 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <config.h>
#include "roken.h"
#ifdef HAVE_UTIL_H
#include <util.h>
#endif
ROKEN_LIB_FUNCTION char * ROKEN_LIB_CALL
pid_file_write(const char *progname)
{
const char *pidfile_dir = NULL;
char *ret = NULL;
FILE *fp;
/*
* Maybe we could have a version of this function (and pidfile())
* where we get a directory from the caller. That would allow us to
* have command-line options for the daemons for this.
*
* For now we use an environment variable.
*/
pidfile_dir = secure_getenv("HEIM_PIDFILE_DIR");
if (pidfile_dir == NULL)
pidfile_dir = _PATH_VARRUN;
if (asprintf(&ret, "%s%s.pid", pidfile_dir, progname) < 0 || ret == NULL)
return NULL;
fp = fopen(ret, "w");
if (fp == NULL) {
free(ret);
return NULL;
}
fprintf(fp, "%lu\n", (unsigned long)getpid());
fclose(fp);
return ret;
}
ROKEN_LIB_FUNCTION void ROKEN_LIB_CALL
pid_file_delete(char **filename)
{
if (*filename != NULL) {
unlink(*filename);
free(*filename);
*filename = NULL;
}
}
static char *pidfile_path;
static pid_t pidfile_pid;
static void
pidfile_cleanup(void)
{
if (pidfile_path != NULL && pidfile_pid == getpid())
pid_file_delete(&pidfile_path);
}
ROKEN_LIB_FUNCTION void ROKEN_LIB_CALL
rk_pidfile(const char *bname)
{
/*
* If the OS has a pidfile(), call that, but still call
* pid_file_write(). Even if both want to write the same file,
* writing it twice will still work.
*/
#ifdef HAVE_PIDFILE
pidfile(bname);
#endif
if (pidfile_path != NULL)
return;
if (bname == NULL)
bname = getprogname();
pidfile_path = pid_file_write(bname);
pidfile_pid = getpid();
#if defined(HAVE_ATEXIT)
if (pidfile_path != NULL)
atexit(pidfile_cleanup);
#elif defined(HAVE_ON_EXIT)
if (pidfile_path != NULL)
on_exit(pidfile_cleanup);
#endif
}
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