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Condition signal.h inclusion in sys/wait.h (bug 21560).

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sys/wait.h includes signal.h unconditionally.  But the permission to
do so is UX-shaded in XPG4.2, and XSI-shaded in POSIX before 2008, so
this should not be unconditional.  This patch fixes this
conservatively: the include is kept, but conditioned on the standards
that permit it (meaning it is still present by default, because
non-XSI POSIX.1:2008 is enabled by default).  <bits/types.h> is now
included unconditionally to provide the required definition of
__pid_t; it was previously included via <signal.h>.  Some standards
require pid_t to be defined here, and all allow it to be defined here;
previously defined via <signal.h>, it's now defined directly in this
header.

Tested for x86_64.  This does not fix any of the sys/wait.h
conformtest failures, but substantially reduces the number of
namespace failures for sys/wait.h for XPG4 and POSIX.

	[BZ #21560]
	* posix/sys/wait.h: Condition include of <signal.h> on
	[__USE_XOPEN_EXTENDED || __USE_XOPEN2K8].  Include <bits/types.h>
	unconditionally.
	[!__pid_t_defined] (pid_t): Define typedef.
This commit is contained in:
Joseph Myers 2017-06-09 13:45:37 +00:00
parent b4971123e9
commit 0862cdcdc8
2 changed files with 17 additions and 2 deletions
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8
ChangeLog
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@ -1,3 +1,11 @@
2017-06-09 Joseph Myers <joseph@codesourcery.com>
[BZ #21560]
* posix/sys/wait.h: Condition include of <signal.h> on
[__USE_XOPEN_EXTENDED || __USE_XOPEN2K8]. Include <bits/types.h>
unconditionally.
[!__pid_t_defined] (pid_t): Define typedef.
2017-06-09 Zack Weinberg <zackw@panix.com>
* include/errno.h (__errno_location): Use __attribute_const__

11
posix/sys/wait.h
View File

@ -26,7 +26,15 @@
__BEGIN_DECLS
#include <signal.h>
#include <bits/types.h>
#ifndef __pid_t_defined
typedef __pid_t pid_t;
# define __pid_t_defined
#endif
#if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
# include <signal.h>
#endif
/* These macros could also be defined in <stdlib.h>. */
#if !defined _STDLIB_H || (!defined __USE_XOPEN && !defined __USE_XOPEN2K8)
@ -98,7 +106,6 @@ extern __pid_t waitpid (__pid_t __pid, int *__stat_loc, int __options);
#if defined __USE_XOPEN || defined __USE_XOPEN2K8
# ifndef __id_t_defined
# include <bits/types.h>
typedef __id_t id_t;
# define __id_t_defined
# endif