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support: Add support_path_support_time64_value

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It allows to check for support on arbitrary timestamp values.
This commit is contained in:
Adhemerval Zanella 2021-03-19 13:44:20 -03:00
parent 5b980d4809
commit 6fbc0540de
2 changed files with 12 additions and 9 deletions
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11
support/support.h
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@ -130,9 +130,16 @@ extern void support_copy_file (const char *from, const char *to);
extern ssize_t support_copy_file_range (int, off64_t *, int, off64_t *,
size_t, unsigned int);
/* Return true is PATH supports 64-bit time_t interfaces for file
/* Return true if PATH supports 64-bit time_t interfaces for file
operations (such as fstatat or utimensat). */
extern bool support_path_support_time64 (const char *path);
extern bool support_path_support_time64_value (const char *path, int64_t at,
int64_t mt);
static __inline bool support_path_support_time64 (const char *path)
{
/* 1s and 2s after y2038 limit. */
return support_path_support_time64_value (path, 0x80000001ULL,
0x80000002ULL);
}
/* Return true if stat supports nanoseconds resolution. */
extern bool support_stat_nanoseconds (void);

10
support/support_path_support_time64.c
View File

@ -36,19 +36,15 @@ utimesat_call (const char *path, const struct __timespec64 tsp[2])
#endif
bool
support_path_support_time64 (const char *path)
support_path_support_time64_value (const char *path, int64_t at, int64_t mt)
{
#ifdef __linux__
/* Obtain the original timestamps to restore at the end. */
struct statx ostx;
TEST_VERIFY_EXIT (statx (AT_FDCWD, path, 0, STATX_BASIC_STATS, &ostx) == 0);
const struct __timespec64 tsp[] =
{
/* 1s and 2s after y2038 limit. */
{ 0x80000001ULL, 0 },
{ 0x80000002ULL, 0 }
};
const struct __timespec64 tsp[] = { { at, 0 }, { mt, 0 } };
/* Return is kernel does not support __NR_utimensat_time64. */
if (utimesat_call (path, tsp) == -1)
return false;