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Only define loff_t for __USE_MISC (bug 14553).

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Bug 14553 reports that sys/types.h defines loff_t unconditionally,
despite it not being part of any supported standard.  This is
permitted by the POSIX *_t reservation, but as a
quality-of-implementation issue it's still best not to define it
except for __USE_MISC.  This patch conditions the definition
accordingly, updating a macro in sysdeps/unix/sysv/linux/sys/quota.h
to use __loff_t so it still works even if __USE_MISC is not defined.

codesearch.debian.net suggests there are quite a lot of loff_t uses
outside glibc, but it might well make sense to change all (few) uses
of loff_t or __loff_t inside glibc to use off64_t or __off64_t
instead, leaving only the definitions, treating this name as
obsolescent.

Tested for x86_64.

	[BZ #14553]
	* posix/sys/types.h (loff_t): Only define for [__USE_MISC].
	* sysdeps/unix/sysv/linux/sys/quota.h (dqoff): Use __loff_t
	instead of loff_t.
This commit is contained in:
Joseph Myers 2018-02-06 21:29:50 +00:00
parent 6d7aa2b531
commit 663e7d7849
3 changed files with 9 additions and 3 deletions
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7
ChangeLog
View File

@ -1,3 +1,10 @@
2018-02-06 Joseph Myers <joseph@codesourcery.com>
[BZ #14553]
* posix/sys/types.h (loff_t): Only define for [__USE_MISC].
* sysdeps/unix/sysv/linux/sys/quota.h (dqoff): Use __loff_t
instead of loff_t.
2018-02-06 Florian Weimer <fweimer@redhat.com>
[BZ #18023]

3
posix/sys/types.h
View File

@ -39,9 +39,8 @@ typedef __u_quad_t u_quad_t;
typedef __fsid_t fsid_t;
# define __u_char_defined
# endif
#endif
typedef __loff_t loff_t;
#endif
#ifndef __ino_t_defined
# ifndef __USE_FILE_OFFSET64

2
sysdeps/unix/sysv/linux/sys/quota.h
View File

@ -114,7 +114,7 @@ struct dqblk
#define dq_btime dq_dqb.dqb_btime
#define dq_itime dq_dqb.dqb_itime
#define dqoff(UID) ((loff_t)((UID) * sizeof (struct dqblk)))
#define dqoff(UID) ((__loff_t)((UID) * sizeof (struct dqblk)))
/* Old name for struct if_dqinfo. */
struct dqinfo