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Consolidate Linux truncate implementations

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This patch consolidates all Linux truncate implementation on
sysdeps/unix/sysv/linux/truncate{64}.c.  It is based on
{INTERNAL,INLINE}_SYSCALL patch [1] to simplify the syscall
construction.

General idea is to build ftruncate iff __OFF_T_MATCHES_OFF64_T is not
defined, otherwise ftruncate64 will be build and ftruncate will be an
alias.  The fallocate will use old compat syscall and pass 32-bit off_t
argument, while fallocate64 will handle the correct off64_t passing using
__ALIGNMENT_ARG and SYSCALL_LL64 macros.

Tested on x86_64, i386, aarch64, and armhf.

	* sysdeps/unix/sysv/linux/arm/truncate64.c: Remove file.
	* sysdeps/unix/sysv/linux/generic/wordsize-32/truncate.c: Likewise.
	* sysdeps/sysv/linux/generic/wordsize-32/truncate64.c: Likewise.
	* sysdeps/unix/sysv/linux/mips/mips32/truncate64.c: Likewise.
	* sysdeps/unix/sysv/linux/mips/mips64/truncate64.c: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/truncate64.c: Likewise.
	* sysdeps/unix/sysv/linux/wordsize-64/truncate64.c: Likewise.
	* sysdeps/unix/sysv/linux/truncate.c: New file.
	* sysdeps/unix/sysv/linux/truncate64.c (truncate64): Use
	INLINE_SYSCALL_CALL, __ALIGNMENT_ARG and SYSCALL_LL64 macros.
	* sysdeps/unix/sysv/linux/mips/mips64/syscalls.list (truncate):
	Remove.
	* sysdeps/unix/sysv/linux/wordsize-64/syscalls.list (truncate):
	Likewise.

[1] https://sourceware.org/ml/libc-alpha/2016-08/msg00646.html
This commit is contained in:
Adhemerval Zanella
2016-08-26 12:19:18 -03:00
parent 87686aeefd
commit d4d8a12960
11 changed files with 40 additions and 159 deletions
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26
sysdeps/unix/sysv/linux/truncate64.c
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@ -15,21 +15,23 @@
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <sys/types.h>
#include <endian.h>
#include <errno.h>
#include <unistd.h>
#include <sysdep.h>
#include <sys/syscall.h>
#include <errno.h>
/* Truncate the file referenced by FD to LENGTH bytes. */
#ifndef __NR_truncate64
# define __NR_truncate64 __NR_truncate
#endif
/* Truncate PATH to LENGTH bytes. */
int
truncate64 (const char *path, off64_t length)
__truncate64 (const char *path, off64_t length)
{
unsigned int low = length & 0xffffffff;
unsigned int high = length >> 32;
int result = INLINE_SYSCALL (truncate64, 3, path,
__LONG_LONG_PAIR (high, low));
return result;
return INLINE_SYSCALL_CALL (truncate64, path,
__ALIGNMENT_ARG SYSCALL_LL64 (length));
}
weak_alias (__truncate64, truncate64)
#ifdef __OFF_T_MATCHES_OFF64_T
weak_alias (__truncate64, truncate);
#endif