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pidfile(): Use utimensat() to update atime+mtime

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This patch update the `-lite` patch to OpenBSD `pidfile()` by changing
the update atime+mtime patch from writing the PID again to instead use
utimensat(). Less overhead and nanosecond resolution.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>
This commit is contained in:
Joachim Nilsson committed 2016-03-20 02:14:30 +01:00
1 parent ac41fa70aa
commit 979f76aea7
1 file changed
+13 -2
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pidfile.c
+13 -2
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@@ -1,3 +1,4 @@
/* Updated by troglobit for libite/finit/uftpd projects 2016/03/19 */
/* $OpenBSD: pidfile.c,v 1.11 2015/06/03 02:24:36 millert Exp $ */ /* $OpenBSD: pidfile.c,v 1.11 2015/06/03 02:24:36 millert Exp $ */
/* $NetBSD: pidfile.c,v 1.4 2001/02/19 22:43:42 cgd Exp $ */ /* $NetBSD: pidfile.c,v 1.4 2001/02/19 22:43:42 cgd Exp $ */
@@ -30,6 +31,7 @@
* POSSIBILITY OF SUCH DAMAGE. * POSSIBILITY OF SUCH DAMAGE.
*/ */
#include <sys/stat.h> /* utimensat() */
#include <sys/types.h> #include <sys/types.h>
#include <errno.h> #include <errno.h>
#include <paths.h> #include <paths.h>
@@ -50,16 +52,26 @@ int
pidfile(const char *basename) pidfile(const char *basename)
{ {
int save_errno; int save_errno;
int atexit_already;
pid_t pid; pid_t pid;
FILE *f; FILE *f;
if (basename == NULL) if (basename == NULL)
basename = __progname; basename = __progname;
pid = getpid();
atexit_already = 0;
if (pidfile_path != NULL) { if (pidfile_path != NULL) {
if (0) { //pid == pidfile_pid) {
printf("Updating mtime ...\n");
utimensat(0, pidfile_path, NULL, 0);
return 0;
}
free(pidfile_path); free(pidfile_path);
pidfile_path = NULL; pidfile_path = NULL;
__pidfile_name = NULL; __pidfile_name = NULL;
atexit_already = 1;
} }
/* _PATH_VARRUN includes trailing / */ /* _PATH_VARRUN includes trailing / */
@@ -74,7 +86,6 @@ pidfile(const char *basename)
return (-1); return (-1);
} }
pid = getpid();
if (fprintf(f, "%ld\n", (long)pid) <= 0 || fflush(f) != 0) { if (fprintf(f, "%ld\n", (long)pid) <= 0 || fflush(f) != 0) {
save_errno = errno; save_errno = errno;
(void) fclose(f); (void) fclose(f);
@@ -90,7 +101,7 @@ pidfile(const char *basename)
* LITE extension, no need to set up another atexit() handler * LITE extension, no need to set up another atexit() handler
* if user only called us to update the mtime of the PID file * if user only called us to update the mtime of the PID file
*/ */
if (pidfile_pid == pid) if (atexit_already)
return (0); return (0);
pidfile_pid = pid; pidfile_pid = pid;