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touch: Avoid unnecessary call to stat 

Now, we first try a utimensat. If it succeeds, we are done, if not (and no -c
flag), create the file, then set the times with futimens.
This commit is contained in:
Michael Forney 2016-07-08 10:24:14 -07:00 committed by sin
parent 2e5f1281ed
commit 3c12b287ec
1 changed files with 9 additions and 14 deletions
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23
touch.c
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@ -18,25 +18,20 @@ static struct timespec times[2] = {{.tv_nsec = UTIME_NOW}};
static void static void
touch(const char *file) touch(const char *file)
{ {
int fd; int fd, ret;
struct stat st;
if (stat(file, &st) < 0) { if (utimensat(AT_FDCWD, file, times, 0) == 0)
if (errno != ENOENT) return;
eprintf("stat %s:", file); if (errno != ENOENT)
if (cflag) eprintf("utimensat %s:", file);
return; if (cflag)
} else {
if (utimensat(AT_FDCWD, file, times, 0) < 0)
eprintf("utimensat %s:", file);
return; return;
}
if ((fd = open(file, O_WRONLY | O_CREAT | O_EXCL, 0666)) < 0) if ((fd = open(file, O_WRONLY | O_CREAT | O_EXCL, 0666)) < 0)
eprintf("open %s:", file); eprintf("open %s:", file);
ret = futimens(fd, times);
close(fd); close(fd);
if (ret < 0)
touch(file); eprintf("futimens %s:", file);
} }
static time_t static time_t