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/* darkstat 3
* copyright (c) 2007 Emil Mikulic.
*
* pidfile.h: pidfile manglement
*
* Permission to use, copy, modify, and distribute this file for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "darkstat.h"
#include "err.h"
#include "str.h"
#include "pidfile.h"
#include <errno.h>
#include <fcntl.h>
#include <pwd.h>
#include <stdlib.h>
#include <unistd.h>
static int pidfd = -1;
static const char *pidname = NULL;
void
pidfile_create(const char *chroot_dir, const char *filename,
const char *privdrop_user)
{
struct passwd *pw;
if (pidfd != -1)
errx(1, "pidfile already created");
errno = 0;
pw = getpwnam(privdrop_user);
if (pw == NULL) {
if (errno == 0)
errx(1, "getpwnam(\"%s\") failed: no such user", privdrop_user);
else
err(1, "getpwnam(\"%s\") failed", privdrop_user);
}
if (chdir(chroot_dir) == -1)
err(1, "chdir(\"%s\") failed", chroot_dir);
pidname = filename;
pidfd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 0600);
if (pidfd == -1)
err(1, "couldn't not create pidfile");
if (chown(filename, pw->pw_uid, pw->pw_gid) == -1)
err(1, "couldn't chown pidfile");
}
void
pidfile_write_close(void)
{
struct str *s;
size_t len;
char *buf;
if (pidfd == -1)
errx(1, "cannot write pidfile: not created");
s = str_make();
str_appendf(s, "%u\n", (unsigned int)getpid());
str_extract(s, &len, &buf);
if (write(pidfd, buf, len) != (int)len)
err(1, "couldn't write to pidfile");
free(buf);
if (close(pidfd) == -1)
warn("problem closing pidfile");
}
void
pidfile_unlink(void)
{
if (pidname == NULL)
return; /* pidfile wasn't created */
if (unlink(pidname) == -1)
warn("problem unlinking pidfile");
}
/* vim:set ts=3 sw=3 tw=78 et: */
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