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List: coreutils-bug
Subject: [patch] enhancement for "test -nt" to support nanosecond timestamps
From: James Youngman <jay () gnu ! org>
Date: 2005-07-17 22:46:51
Message-ID: 20050717224651.GA26032 () excession ! spiral-arm ! org
[Download RAW message or body]
The attcached patch enhances "test" and "[" to take account of the
nanoseconds part of the mtime when evaluating "test A -nt B" and "test
A -ot B".
Regards,
James.
2005-07-17 James Youngman <jay@gnu.org>
* src/test.c (age_of): Return the nanoseconds part of the
timestamp if this is available.
* configure.ac: Determine if 'struct stat' has a member st_mtim
which contains the nanoseconds part of the mtime.
["coreutils.test-ns.patch" (text/plain)]
Index: configure.ac
===================================================================
RCS file: /cvsroot/coreutils/coreutils/configure.ac,v
retrieving revision 1.59
diff -u -r1.59 configure.ac
--- configure.ac 9 Jul 2005 07:36:33 -0000 1.59
+++ configure.ac 17 Jul 2005 22:34:58 -0000
@@ -52,6 +52,8 @@
gl_WINSIZE_IN_PTEM
+AC_CHECK_MEMBERS([struct stat.st_mtim.tv_nsec],,,[#include <sys/stat.h>])
+
AC_MSG_CHECKING(whether localtime caches TZ)
AC_CACHE_VAL(utils_cv_localtime_cache,
[if test x$ac_cv_func_tzset = xyes; then
Index: src/test.c
===================================================================
RCS file: /cvsroot/coreutils/coreutils/src/test.c,v
retrieving revision 1.120
diff -u -r1.120 test.c
--- src/test.c 30 May 2005 07:34:23 -0000 1.120
+++ src/test.c 17 Jul 2005 22:34:58 -0000
@@ -160,14 +160,23 @@
}
/* Find the modification time of FILE, and stuff it into *AGE.
+ If the timestamp has a nonoseconds part, stuff that into *NS;
+ otherwise stuff zero into *NS.
Return true if successful. */
static bool
-age_of (char const *filename, time_t *age)
+age_of (char const *filename, time_t *age, long *ns)
{
struct stat finfo;
bool ok = (stat (filename, &finfo) == 0);
if (ok)
- *age = finfo.st_mtime;
+ {
+ *age = finfo.st_mtime;
+#ifdef HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC
+ *ns = finfo.st_mtim.tv_nsec;
+#else
+ *ns = 0;
+#endif
+ }
return ok;
}
@@ -319,13 +328,18 @@
/* nt - newer than */
time_t lt IF_LINT (= 0);
time_t rt IF_LINT (= 0);
+ unsigned long l_ns IF_LINT (= 0);
+ unsigned long r_ns IF_LINT (= 0);
bool le, re;
pos += 3;
if (l_is_l | r_is_l)
test_syntax_error (_("-nt does not accept -l\n"), NULL);
- le = age_of (argv[op - 1], <);
- re = age_of (argv[op + 1], &rt);
- return le > re || (le && lt > rt);
+ le = age_of (argv[op - 1], <, &l_ns);
+ re = age_of (argv[op + 1], &rt, &r_ns);
+ if (le && re && (rt == lt))
+ return l_ns > r_ns;
+ else
+ return le > re || (le && lt > rt);
}
break;
@@ -349,13 +363,18 @@
/* ot - older than */
time_t lt IF_LINT (= 0);
time_t rt IF_LINT (= 0);
+ unsigned long l_ns IF_LINT (= 0);
+ unsigned long r_ns IF_LINT (= 0);
bool le, re;
pos += 3;
if (l_is_l | r_is_l)
test_syntax_error (_("-ot does not accept -l\n"), NULL);
- le = age_of (argv[op - 1], <);
- re = age_of (argv[op + 1], &rt);
- return le < re || (re && lt < rt);
+ le = age_of (argv[op - 1], <, &l_ns);
+ re = age_of (argv[op + 1], &rt, &r_ns);
+ if (le && re && (lt == rt))
+ return l_ns < r_ns;
+ else
+ return le < re || (re && lt < rt);
}
break;
}
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