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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
touch(const char *file)
{
int fd;
struct stat st;
int fd, ret;
if (stat(file, &st) < 0) {
if (errno != ENOENT)
eprintf("stat %s:", file);
if (cflag)
return;
} else {
if (utimensat(AT_FDCWD, file, times, 0) < 0)
eprintf("utimensat %s:", file);
if (utimensat(AT_FDCWD, file, times, 0) == 0)
return;
if (errno != ENOENT)
eprintf("utimensat %s:", file);
if (cflag)
return;
}
if ((fd = open(file, O_WRONLY | O_CREAT | O_EXCL, 0666)) < 0)
eprintf("open %s:", file);
ret = futimens(fd, times);
close(fd);
touch(file);
if (ret < 0)
eprintf("futimens %s:", file);
}
static time_t