add utime (utimensat, futimens) functional tests

these tests check for the ability to set file timestamps using
UTIME_NOW, UTIME_OMIT, and explicit timespecs. they indirectly check
that fstat works as well, and include a check of the first Y2038
timestamp that overflows 32-bit time_t, reporting errors for a Y2038
EOL implementaton (if time_t is 32-bit) or a kernel, filesystem, or
library implementation that fails to set and read back timestamps past
the 32-bit limit despite having a time_t type that can represent such
a timestamp.

diff --git a/src/functional/utime.c b/src/functional/utime.c
new file mode 100644 (file)
index 0000000..7fa7a1f
--- /dev/null
+++ b/src/functional/utime.c
@@ -0,0 +1,73 @@
+#include <sys/stat.h>
+#include <errno.h>
+#include <string.h>
+#include <stdio.h>
+#include <time.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include "test.h"
+
+#define TEST(c, ...) ((c) ? 1 : (t_error(#c" failed: " __VA_ARGS__),0))
+#define TESTVAL(v,op,x) TEST(v op x, "%jd\n", (intmax_t)(v))
+
+int main(void)
+{
+       struct stat st;
+       FILE *f;
+       int fd;
+       time_t t;
+
+       TEST(utimensat(AT_FDCWD, "/dev/null/invalid", ((struct timespec[2]){{.tv_nsec=UTIME_OMIT},{.tv_nsec=UTIME_OMIT}}), 0)==0 || errno==ENOTDIR,
+               "%s\n", strerror(errno));
+       TEST(futimens(-1, ((struct timespec[2]){{.tv_nsec=UTIME_OMIT},{.tv_nsec=UTIME_OMIT}}))==0 || errno==EBADF,
+               "%s\n", strerror(errno));
+
+       if (!TEST(f = tmpfile())) return t_status;
+       fd = fileno(f);
+
+       TEST(futimens(fd, (struct timespec[2]){0}) == 0, "\n");
+       TEST(fstat(fd, &st) == 0, "\n");
+       TESTVAL(st.st_atim.tv_sec,==,0);
+       TESTVAL(st.st_atim.tv_nsec,==,0);
+       TESTVAL(st.st_mtim.tv_sec,==,0);
+       TESTVAL(st.st_mtim.tv_nsec,==,0);
+
+       TEST(futimens(fd, ((struct timespec[2]){{.tv_sec=1,.tv_nsec=UTIME_OMIT},{.tv_sec=1,.tv_nsec=UTIME_OMIT}})) == 0, "\n");
+       TEST(fstat(fd, &st) == 0, "\n");
+       TESTVAL(st.st_atim.tv_sec,==,0);
+       TESTVAL(st.st_atim.tv_nsec,==,0);
+       TESTVAL(st.st_mtim.tv_sec,==,0);
+       TESTVAL(st.st_mtim.tv_nsec,==,0);
+
+       t = time(0);
+
+       TEST(futimens(fd, ((struct timespec[2]){{.tv_nsec=UTIME_NOW},{.tv_nsec=UTIME_OMIT}})) == 0, "\n");
+       TEST(fstat(fd, &st) == 0, "\n");
+       TESTVAL(st.st_atim.tv_sec,>=,t);
+       TESTVAL(st.st_mtim.tv_sec,==,0);
+       TESTVAL(st.st_mtim.tv_nsec,==,0);
+       
+       TEST(futimens(fd, (struct timespec[2]){0}) == 0, "\n");
+       TEST(futimens(fd, ((struct timespec[2]){{.tv_nsec=UTIME_OMIT},{.tv_nsec=UTIME_NOW}})) == 0, "\n");
+       TEST(fstat(fd, &st) == 0, "\n");
+       TESTVAL(st.st_atim.tv_sec,==,0);
+       TESTVAL(st.st_mtim.tv_sec,>=,t);
+
+       TEST(futimens(fd, ((struct timespec[2]){{.tv_nsec=UTIME_NOW},{.tv_nsec=UTIME_OMIT}})) == 0, "\n");
+       TEST(fstat(fd, &st) == 0, "\n");
+       TESTVAL(st.st_atim.tv_sec,>=,t);
+       TESTVAL(st.st_mtim.tv_sec,>=,t);
+
+       if (TEST((time_t)(1LL<<32) == (1LL<<32), "implementation has Y2038 EOL\n")) {
+               if (TEST(futimens(fd, ((struct timespec[2]){{.tv_sec=1LL<<32},{.tv_sec=1LL<<32}})) == 0, "%s\n", strerror(errno))) {
+                       TEST(fstat(fd, &st) == 0, "\n");
+                       TESTVAL(st.st_atim.tv_sec, ==, 1LL<<32);
+                       TESTVAL(st.st_mtim.tv_sec, ==, 1LL<<32);
+               }
+       }
+
+       fclose(f);
+
+       return t_status;
+}