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* sysdeps/unix/sysv/linux/bits/waitflags.h

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(WSTOPPED, WEXITED, WCONTINUED, WNOWAIT): New macros.
	* sysdeps/unix/sysv/linux/kernel-features.h (__ASSUME_WAITID_SYSCALL):
	New macro.
	* sysdeps/unix/sysv/linux/waitid.c: New file.  Use new syscall when
	available, or fall back to the waitpid-based generic code.
This commit is contained in:
Roland McGrath
2004-09-01 19:39:17 +00:00
parent 66cc59de5b
commit 6698501fda
4 changed files with 88 additions and 1 deletions
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67
sysdeps/unix/sysv/linux/waitid.c Normal file
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/* Linux implementation of waitid.
Copyright (C) 2004 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <errno.h>
#include <sys/wait.h>
#include <kernel-features.h>
#include <sysdep.h>
#ifdef __NR_waitid
# if __ASSUME_WAITID_SYSCALL > 0
static inline int
do_waitid (idtype_t idtype, id_t id, siginfo_t *infop, int options)
{
return INLINE_SYSCALL (waitid, 4, idtype, id, infop, options);
}
# define NO_DO_WAITID
# else
static int do_compat_waitid (idtype_t idtype, id_t id,
siginfo_t *infop, int options);
# define DO_WAITID do_compat_waitid
static int
do_waitid (idtype_t idtype, id_t id, siginfo_t *infop, int options)
{
static int waitid_works;
if (waitid_works > 0)
return INLINE_SYSCALL (waitid, 4, idtype, id, infop, options);
if (waitid_works == 0)
{
int result = INLINE_SYSCALL (waitid, 4, idtype, id, infop, options);
if (result < 0 && errno == ENOSYS)
waitid_works = -1;
else
{
waitid_works = 1;
return result;
}
}
return do_compat_waitid (idtype, id, infop, options);
}
# endif
#endif
#include "sysdeps/posix/waitid.c"