nsec_t now_nsec(clockid_t clock_id) {
struct timespec ts;
assert_se(clock_gettime(clock_id, &ts) == 0);
return timespec_load_nsec(&ts);
}
static int apply_timestamp(const char *path, struct timespec *ts) {
struct timespec twice[2] = {
*ts,
*ts
};
int fd = -1;
_cleanup_fclose_ FILE *f = NULL;
int r;
assert(path);
assert(ts);
/*
* We store the timestamp both as mtime of the file and in the file itself,
* to support filesystems which cannot store nanosecond-precision timestamps.
* Hence, don't bother updating the file, let's just rewrite it.
*/
r = mac_selinux_create_file_prepare(path, S_IFREG);
if (r < 0)
return log_error_errno(r, "Failed to set SELinux context for %s: %m", path);
fd = open(path, O_CREAT|O_WRONLY|O_TRUNC|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, 0644);
mac_selinux_create_file_clear();
if (fd < 0) {
if (errno == EROFS)
return log_debug("Can't create timestamp file %s, file system is read-only.", path);
return log_error_errno(errno, "Failed to create/open timestamp file %s: %m", path);
}
f = fdopen(fd, "w");
if (!f) {
safe_close(fd);
return log_error_errno(errno, "Failed to fdopen() timestamp file %s: %m", path);
}
(void) fprintf(f,
"%s"
"TimestampNSec=" NSEC_FMT "\n",
MESSAGE, timespec_load_nsec(ts));
fflush(f);
if (futimens(fd, twice) < 0)
return log_error_errno(errno, "Failed to update timestamp on %s: %m", path);
return 0;
}
