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y2038: linux: Provide __futimens64 implementation

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This patch provides new __futimens64 explicit 64 bit function for
setting access and modification time of file (by using its file descriptor).
Moreover, a 32 bit version - __futimens has been refactored to internally use
__futimens64.

The __futimens is now supposed to be used on systems still supporting
32 bit time (__TIMESIZE != 64) - hence the necessary conversions to 64 bit
struct __timespec64.
When pointer to struct __timespec64 is NULL - the file access and modification
time is set to the current one (by the kernel) and no conversions from struct
timespec to __timespec64 are performed.

The __futimens64 reuses __utimensat64_helper defined for __utimensat64.

The test procedure for __futimens64 is the same as for __utimensat64 conversion
patch.
This commit is contained in:
Lukasz Majewski 2019-10-24 14:34:46 +02:00
parent f5b6fd258b
commit 42893aa38f
2 changed files with 26 additions and 3 deletions
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7
include/time.h
View File

@ -158,6 +158,13 @@ extern int __utimensat64_helper (int fd, const char *file,
const struct __timespec64 tsp[2], int flags);
libc_hidden_proto (__utimensat64_helper);
#if __TIMESIZE == 64
# define __futimens64 __futimens
#else
extern int __futimens64 (int fd, const struct __timespec64 tsp[2]);
libc_hidden_proto (__futimens64);
#endif
/* Compute the `struct tm' representation of T,
offset OFFSET seconds east of UTC,
and store year, yday, mon, mday, wday, hour, min, sec into *TP.

22
sysdeps/unix/sysv/linux/futimens.c
View File

@ -29,10 +29,26 @@
Starting with 2.6.22 the Linux kernel has the utimensat syscall which
can be used to implement futimens. */
int
futimens (int fd, const struct timespec tsp[2])
__futimens64 (int fd, const struct __timespec64 tsp64[2])
{
if (fd < 0)
return INLINE_SYSCALL_ERROR_RETURN_VALUE (EBADF);
/* Avoid implicit array coercion in syscall macros. */
return INLINE_SYSCALL (utimensat, 4, fd, NULL, &tsp[0], 0);
return __utimensat64_helper (fd, NULL, &tsp64[0], 0);
}
#if __TIMESIZE != 64
int
__futimens (int fd, const struct timespec tsp[2])
{
struct __timespec64 tsp64[2];
if (tsp)
{
tsp64[0] = valid_timespec_to_timespec64 (tsp[0]);
tsp64[1] = valid_timespec_to_timespec64 (tsp[1]);
}
return __futimens64 (fd, tsp ? &tsp64[0] : NULL);
}
#endif
weak_alias (__futimens, futimens)